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Articoli di riviste sul tema "Mutation"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Hyodo, Toshiki, Nobuyuki Kuribayashi, Chonji Fukumoto, et al. "Abstract 4649: Proposal of the concept of “p53 mutational spectrum”: Its clinical implication in oral squamous cell carcinoma." Cancer Research 85, no. 8_Supplement_1 (2025): 4649. https://doi.org/10.1158/1538-7445.am2025-4649.

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Abstract The p53 gene is the most frequently mutated gene in malignant tumors. We found that p53 abnormalities were observed in most cases of oral squamous cell carcinoma (OSCC). Therefore, it is necessary to search for type of the functional abnormality (complete loss of function, partial loss of function, or gain of oncogenic function) of the p53 gene rather than the presence or absence of gene mutation. Here we would like to propose the concept “p53 mutational spectrum”. In this study we performed whole-exome sequencing of p53 using clinical specimens from OSCC and attempted to clarify the

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2

GARCÍA-DORADO, A., C. LÓPEZ-FANJUL, and A. CABALLERO. "Properties of spontaneous mutations affecting quantitative traits." Genetical Research 74, no. 3 (1999): 341–50. http://dx.doi.org/10.1017/s0016672399004206.

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Recent mutation accumulation results from invertebrate species suggest that mild deleterious mutation is far less frequent than previously thought, implying smaller expressed mutational loads. Although the rate (λ) and effect (s) of very slight deleterious mutation remain unknown, most mutational fitness decline would come from moderately deleterious mutation (s ≈ 0·2, λ ≈ 0·03), and this situation would not qualitatively change in harsh environments. Estimates of the average coefficient of dominance (h¯) of non-severe deleterious mutations are controversial. The typical value of h¯ = 0·4 can

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3

Matsutani, Taro, Yuki Ueno, Tsukasa Fukunaga, and Michiaki Hamada. "Discovering novel mutation signatures by latent Dirichlet allocation with variational Bayes inference." Bioinformatics 35, no. 22 (2019): 4543–52. http://dx.doi.org/10.1093/bioinformatics/btz266.

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Abstract Motivation A cancer genome includes many mutations derived from various mutagens and mutational processes, leading to specific mutation patterns. It is known that each mutational process leads to characteristic mutations, and when a mutational process has preferences for mutations, this situation is called a ‘mutation signature.’ Identification of mutation signatures is an important task for elucidation of carcinogenic mechanisms. In previous studies, analyses with statistical approaches (e.g. non-negative matrix factorization and latent Dirichlet allocation) revealed a number of muta

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4

Lee, Joon-Hyop, Jiyoung Ahn, Won Seo Park, et al. "Colorectal Cancer Prognosis is Not Associated with BRAF and KRAS Mutations-A STROBE Compliant Study." Journal of Clinical Medicine 8, no. 1 (2019): 111. http://dx.doi.org/10.3390/jcm8010111.

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Background: We investigated the associations between v-Raf murine sarcoma viral oncogene homolog B1 (BRAFV600E, henceforth BRAF) and v-Ki-ras2 Kirsten rat sarcoma viral oncogene homolog (KRAS) mutations and colorectal cancer (CRC) prognosis, using The Cancer Genome Atlas (TCGA) and the Gene Expression Omnibus (GSE39582) datasets. Materials and Methods: The effects of BRAF and KRAS mutations on overall survival (OS) and disease-free survival (DFS) of CRC were evaluated. Results: The mutational status of BRAF and KRAS genes was not associated with overall survival (OS) or DFS of the CRC patients

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5

Bustamante, A. V., A. M. Sanso, D. O. Segura, A. E. Parma, and P. M. A. Lucchesi. "Dynamic of Mutational Events in Variable Number Tandem Repeats ofEscherichia coliO157:H7." BioMed Research International 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/390354.

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VNTRs regions have been successfully used for bacterial subtyping; however, the hypervariability in VNTR loci is problematic when trying to predict the relationships among isolates. Since few studies have examined the mutation rate of these markers, our aim was to estimate mutation rates of VNTRs specific for verotoxigenicE. coliO157:H7. The knowledge of VNTR mutational rates and the factors affecting them would make MLVA more effective for epidemiological or microbial forensic investigations. For this purpose, we analyzed nine loci performing parallel, serial passage experiments (PSPEs) on 9

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6

Ellis, Nathan A. "Mutation-causing mutations." Nature 381, no. 6578 (1996): 110–11. http://dx.doi.org/10.1038/381110a0.

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7

Pawlik, Timothy M., Darrell R. Borger, Yuhree Kim, et al. "Genomic profiling of intrahepatic cholangiocarcinoma: Refining prognostic determinants and identifying therapeutic targets." Journal of Clinical Oncology 32, no. 3_suppl (2014): 210. http://dx.doi.org/10.1200/jco.2014.32.3_suppl.210.

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210 Background: The molecular alterations that drive tumorigenesis in intrahepatic cholangiocarcinoma (ICC) remain poorly defined. We sought to define the incidence and prognostic significance of mutations associated with ICC among patients undergoing surgical resection. Methods: 138 patients who underwent resection at 6 centers in the United States and Europe were included in the cohort. Mutational profiling was performed using nucleic acids that were extracted from resected ICC tumor specimens; mutations were identified using a multiplexed mutational profiling platform. The frequency of muta

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8

Robinson, Philip S., Tim H. H. Coorens, Claire Palles, et al. "Increased somatic mutation burdens in normal human cells due to defective DNA polymerases." Nature Genetics 53, no. 10 (2021): 1434–42. http://dx.doi.org/10.1038/s41588-021-00930-y.

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AbstractMutation accumulation in somatic cells contributes to cancer development and is proposed as a cause of aging. DNA polymerases Pol ε and Pol δ replicate DNA during cell division. However, in some cancers, defective proofreading due to acquired POLE/POLD1 exonuclease domain mutations causes markedly elevated somatic mutation burdens with distinctive mutational signatures. Germline POLE/POLD1 mutations cause familial cancer predisposition. Here, we sequenced normal tissue and tumor DNA from individuals with germline POLE/POLD1 mutations. Increased mutation burdens with characteristic muta

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9

Trindade, Sandra, Lilia Perfeito, and Isabel Gordo. "Rate and effects of spontaneous mutations that affect fitness in mutator Escherichia coli." Philosophical Transactions of the Royal Society B: Biological Sciences 365, no. 1544 (2010): 1177–86. http://dx.doi.org/10.1098/rstb.2009.0287.

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Knowledge of the mutational parameters that affect the evolution of organisms is of key importance in understanding the evolution of several characteristics of many natural populations, including recombination and mutation rates. In this study, we estimated the rate and mean effect of spontaneous mutations that affect fitness in a mutator strain of Escherichia coli and review some of the estimation methods associated with mutation accumulation (MA) experiments. We performed an MA experiment where we followed the evolution of 50 independent mutator lines that were subjected to repeated bottlene

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10

Mohammadi, Mahmoud, Evelyne Roets, Roos F. Bleckman, et al. "Impact of Mutation Profile on Outcomes of Neoadjuvant Therapy in GIST." Cancers 17, no. 4 (2025): 634. https://doi.org/10.3390/cancers17040634.

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Background: Neoadjuvant imatinib therapy plays a crucial role in the management of gastrointestinal stromal tumors (GISTs), but its impact across various mutational profiles remains uncertain. Objective: The aim of this study is to describe the clinicopathological features and to assess the response and surgical outcomes of neoadjuvant imatinib in GIST patients exhibiting diverse mutational profiles. Methods: We conducted a retrospective study, extracting data from the Dutch GIST Registry, including patients treated with neoadjuvant imatinib. Response rate was the primary outcome, and secondar

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11

Wayne, Marta L., and Trudy F. C. Mackay. "Quantitative Genetics of Ovariole Number in Drosophila melanogaster. II. Mutational Variation and Genotype-Environment Interaction." Genetics 148, no. 1 (1998): 201–10. http://dx.doi.org/10.1093/genetics/148.1.201.

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Abstract The rare alleles model of mutation-selection balance (MSB) hypothesis for the maintenance of genetic variation was evaluated for two quantitative traits, ovariole number and body size. Mutational variances (VM) for these traits, estimated from mutation accumulation lines, were 4.75 and 1.97 × 10−4 times the environmental variance (VE), respectively. The mutation accumulation lines were studied in three environments to test for genotype × environment interaction (GEI) of new mutations; significant mutational GEI was found for both traits. Mutations for ovariole number have a quadratic

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12

Watters, M. K., and D. R. Stadler. "Spontaneous mutation during the sexual cycle of Neurospora crassa." Genetics 139, no. 1 (1995): 137–45. http://dx.doi.org/10.1093/genetics/139.1.137.

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Abstract The DNA sequences of 42 spontaneous mutations of the mtr gene in Neurospora crassa have been determined. The mutants were selected among sexual spores to represent mutations arising in the sexual cycle. Three sexual-cycle-specific mutational classes are described: hotspot mutants, spontaneous repeat-induced point mutation (RIPs) and mutations occurring during a mutagenic phase of the sexual cycle. Together, these three sexual-cycle-specific mutational classes account for 50% of the mutations in the sexual-cycle mutational spectrum. One third of all mutations occurred at one of two mut

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13

Pálinkás, Hajnalka Laura, Lőrinc Pongor, Máté Balajti, et al. "Primary Founder Mutations in the PRKDC Gene Increase Tumor Mutation Load in Colorectal Cancer." International Journal of Molecular Sciences 23, no. 2 (2022): 633. http://dx.doi.org/10.3390/ijms23020633.

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The clonal composition of a malignant tumor strongly depends on cellular dynamics influenced by the asynchronized loss of DNA repair mechanisms. Here, our aim was to identify founder mutations leading to subsequent boosts in mutation load. The overall mutation burden in 591 colorectal cancer tumors was analyzed, including the mutation status of DNA-repair genes. The number of mutations was first determined across all patients and the proportion of genes having mutation in each percentile was ranked. Early mutations in DNA repair genes preceding a mutational expansion were designated as founder

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14

Sane, Mrudula, Shazia Parveen, and Deepa Agashe. "Mutation bias alters the distribution of fitness effects of mutations." PLOS Biology 23, no. 7 (2025): e3003282. https://doi.org/10.1371/journal.pbio.3003282.

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Mutation bias is an important factor determining the diversity of genetic variants available for selection. As adaptation proceeds and some beneficial mutations are fixed, new beneficial mutations become rare, limiting further adaptation. The depletion of beneficial mutations is especially stark within the mutational class favored by the existing mutation bias. Recent theoretical work predicts that this problem may be alleviated by a change in the direction of mutation bias (i.e., a bias reversal). If populations sample previously underexplored types of mutations, the distribution of fitness e

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15

Lee, Ye Ji, Youn Jung Kim, Wonseon Chae, Seon Hee Kim, and Jung-Wook Kim. "EDA Mutations Causing X-Linked Recessive Oligodontia with Variable Expression." Genes 16, no. 1 (2024): 12. https://doi.org/10.3390/genes16010012.

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Background/Objectives: The ectodysplasin A (EDA) gene, a member of the tumor necrosis factor ligand superfamily, is involved in the early epithelial–mesenchymal interaction that regulates ectoderm-derived appendage formation. Numerous studies have shown that mutations in the EDA gene can cause X-linked ectodermal dysplasia (ED) and non-syndromic oligodontia (NSO). Accordingly, this study aimed to identify the causative genetic mutations of the EDA gene. Methods: We investigated EDA gene mutations in two X-linked oligodontia families using candidate gene sequencing and whole-exome sequencing, w

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Lee, Seung-Shin, Jae-Sook Ahn, Taehyung Kim, et al. "RUNX1 Mutation in Cytogenetically Normal Acute Myeloid Leukemia : Clinical Implications, Co-Mutation Analysis." Blood 128, no. 22 (2016): 5253. http://dx.doi.org/10.1182/blood.v128.22.5253.5253.

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Abstract Background and Objectives Acute Myeloid Leukemia (AML) is a cytogenetically and molecularly heterogeneous disease. In the recent decades, many genetic mutations and their clinical significances in AML have been identified with the development of new genomics technology. Based on these advances, new 2 entities were added to the WHO 2008 classification : AML with mutated NPM1 and AML with mutated CEBPA. Likewise, AML with RUNX1 mutation are now considered as a new provisional entity in the next update of WHO classification. In this work, we characterized patients with cytogenetically no

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Shang, Yanhong, Hao Zhang, Aiming Zang, et al. "Abstract 5754: The molecular characteristics of EGFR co-mutations in lung adenocarcinoma." Cancer Research 82, no. 12_Supplement (2022): 5754. http://dx.doi.org/10.1158/1538-7445.am2022-5754.

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Abstract Background: With the development of sensitive next-generation sequencing (NGS) techniques that go beyond the genotyping of specific mutations, detection rates for uncommon mutations have risen clinically. Given this rise in mutation identification, discoveries regarding isolation or coexistent mutations with the EGFR mutation (termed a “complex” mutation) are in “uncharted territory” in terms of their biological impacts on oncogenic pathways and their sensitivity or resistance, to EGFR TKIs. Methods: Targeted NGS for 450 genes was performed in OrigiMed (Shanghai, China), a College of

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18

Kapoor, Ritika R., Sarah E. Flanagan, Piers Fulton, et al. "Hyperinsulinism–hyperammonaemia syndrome: novel mutations in the GLUD1 gene and genotype–phenotype correlations." European Journal of Endocrinology 161, no. 5 (2009): 731–35. http://dx.doi.org/10.1530/eje-09-0615.

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BackgroundActivating mutations in the GLUD1 gene (which encodes for the intra-mitochondrial enzyme glutamate dehydrogenase, GDH) cause the hyperinsulinism–hyperammonaemia (HI/HA) syndrome. Patients present with HA and leucine-sensitive hypoglycaemia. GDH is regulated by another intra-mitochondrial enzyme sirtuin 4 (SIRT4). Sirt4 knockout mice demonstrate activation of GDH with increased amino acid-stimulated insulin secretion.ObjectivesTo study the genotype–phenotype correlations in patients with GLUD1 mutations. To report the phenotype and functional analysis of a novel mutation (P436L) in th

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Balamurugan, Kuppareddi, Martin L. Tracey, Uwe Heine, George C. Maha, and George T. Duncan. "Mutation at the Human D1S80 Minisatellite Locus." Scientific World Journal 2012 (2012): 1–8. http://dx.doi.org/10.1100/2012/917235.

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Little is known about the general biology of minisatellites. The purpose of this study is to examine repeat mutations from the D1S80 minisatellite locus by sequence analysis to elucidate the mutational process at this locus. This is a highly polymorphic minisatellite locus, located in the subtelomeric region of chromosome 1. We have analyzed 90,000 human germline transmission events and found seven (7) mutations at this locus. The D1S80 alleles of the parentage trio, the child, mother, and the alleged father were sequenced and the origin of the mutation was determined. Using American Associati

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Tarlock, Katherine, Todd M. Cooper, Todd A. Alonzo, et al. "Mutational Concordance from Diagnosis and Relapse in Pediatric Acute Myeloid Leukemia: A Report from the Children's Oncology Group." Blood 128, no. 22 (2016): 2846. http://dx.doi.org/10.1182/blood.v128.22.2846.2846.

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Abstract The range of genomic drivers of leukemogenesis and clonal nature of the disease illustrate the heterogeneity of the mutational spectrum in AML. Genomic interrogation of the evolution of AML has begun to highlight the scope of somatic changes that occur between diagnosis and relapse. A total of 1,214 patients were treated on the Children's Oncology Group trials AAML03P1 and AAML0531, of which 398 had relapse after initial remission. Of this cohort, 201 patients had matching diagnostic and relapse specimens for molecular profiling for the most common somatic mutations in pediatric AML (

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Claes, Kathleen, Eva Machackova, Michel De Vos, Bruce Poppe, Anne De Paepe, and Ludwine Messiaen. "Mutation Analysis of the BRCA1 and BRCA2 Genes in the Belgian Patient Population and Identification of a Belgian Founder Mutation BRCA1 IVS5+3A>G." Disease Markers 15, no. 1-3 (1999): 69–73. http://dx.doi.org/10.1155/1999/241046.

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Since the identification of the BRCA1 and BRCA2 genes, several hundred different germline mutations in both genes have been reported. Recurrent mutations are rare and mainly due to founder effects. As the mutational spectrum of the BRCA1 and BRCA2 genes in the Belgian patient population is largely unknown, we initiated mutation analysis for the complete coding sequence of both genes in Belgian families with multiple breast and/or ovarian cancer patients and in “sporadic” patients with early onset disease. We completed the analysis in 49 families and in 19 “sporadic” female patients with early

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Wood, Anthony C., Yonghong Zhang, Qianxing Mo, et al. "Evaluation of Tumor DNA Sequencing Results in Patients with Gastric and Gastroesophageal Junction Adenocarcinoma Stratified by TP53 Mutation Status." Oncologist 27, no. 4 (2022): 307–13. http://dx.doi.org/10.1093/oncolo/oyac018.

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Abstract Background Gastric cancer (GC) and gastroesophageal junction adenocarcinomas (GEJ) are molecularly diverse. TP53 is the most frequently altered gene with approximately 50% of patients harboring mutations. This qualitative study describes the distinct genomic alterations in GCs and GEJs stratified by TP53 mutation status. Patients and Methods Tumor DNA sequencing results of 324 genes from 3741 patients with GC and GEJ were obtained from Foundation Medicine. Association between gene mutation frequency and TP53 mutation status was examined using Fisher’s exact test. Functional gene group

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Kang, S., S. S. Seo, H. J. Chang, C. W. Yoo, S. Y. Park, and S. M. Dong. "Mutual exclusiveness between PIK3CA and KRAS mutations in endometrial carcinoma." International Journal of Gynecologic Cancer 18, no. 6 (2008): 1339–43. http://dx.doi.org/10.1111/j.1525-1438.2007.01172.x.

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In endometrial carcinomas (ECs), previous report suggested that PIK3CA mutations do not coexist with KRAS mutations, but the significant mutual exclusiveness has not been demonstrated. In this study, we examined the mutation frequency of PIK3CA in EC and its mutual exclusiveness with KRAS mutation. We performed mutational analysis of PIK3CA through a polymerase chain reaction single-strand conformation polymorphism assay in 44 cases of endometrial cancer and analyzed the correlation with loss of PTEN, KRAS mutation, and RASSF1A hypermethylation. Somatic mutations of PIK3CA were detected in 14

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Ahn, Jae-Sook, Hyeoung-Joon Kim, Yeo-Kyeoung Kim, et al. "An Adverse Prognostic Effect of Homozygous TET2 Mutational Status on the Relapse Risk of Acute Myeloid Leukemia Patients of Normal Karyotype." Blood 124, no. 21 (2014): 1052. http://dx.doi.org/10.1182/blood.v124.21.1052.1052.

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Abstract Purpose Ten-eleven-translocation oncogene family member 2 (TET2) mutations play leukemogenic roles in patients with acute myeloid leukemia (AML). However, the prognostic significance of such mutations in normal-karyotype (NK) AML patients remains controversial, especially that of homozygous TET2 mutations. n the present study, we attempted 1) to evaluate the prevalence of TET2 mutations in NK-AML patients; 2) to clarify the prognostic role played by TET2 mutation, especially homozygous mutation, in NK-AML patients; and, 3) to analyze associations among TET2 mutations and other mutatio

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Delaugerre, Constance, Mireille Mouroux, Anne Yvon-Groussin, et al. "Prevalence and Conditions of Selection of E44D/A and V118I Human Immunodeficiency Virus Type 1 Reverse Transcriptase Mutations in Clinical Practice." Antimicrobial Agents and Chemotherapy 45, no. 3 (2001): 946–48. http://dx.doi.org/10.1128/aac.45.3.946-948.2001.

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ABSTRACT Recently, it has been shown that a new mutational pattern (the E44D/A and/or V118I mutation) confers moderate phenotypic lamivudine resistance in the absence of the M184V mutation. The E44D/A and/or the V118I mutation does not exist in drug-naive patients, and the prevalence increases with the number of treatment regimens and lamivudine experience. The mutations can preexist in nucleoside-experienced but lamivudine-naive patients. They are always associated with zidovudine resistance-associated mutations, even in the absence of M184V. These mutations are more stable than the M184V sub

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FRY, JAMES D. "Rapid mutational declines of viability in Drosophila." Genetical Research 77, no. 1 (2001): 53–60. http://dx.doi.org/10.1017/s0016672300004882.

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High rates of mildly deleterious mutation could cause the extinction of small populations, reduce neutral genetic variation and provide an evolutionary advantage for sex. In the first attempts to estimate the rate of mildly deleterious mutation, Mukai and Ohnishi allowed spontaneous mutations to accumulate on D. melanogaster second chromosomes shielded from recombination and selection. Viability of the shielded chromosomes appeared to decline rapidly, implying a deleterious mutation rate on the order of one per zygote per generation. These results have been challenged, however; at issue is whe

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Golding, G. Brian, Patricia J. Gearhart, and Barry W. Glickman. "Patterns of Somatic Mutations in Immunoglobulin Variable Genes." Genetics 115, no. 1 (1987): 169–76. http://dx.doi.org/10.1093/genetics/115.1.169.

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ABSTRACT The mechanism responsible for somatic mutation in the variable genes of antibodies is unknown and may differ from previously described mechanisms that produce mutation in DNA. We have analyzed 421 somatic mutations from the rearranged immunoglobulin variable genes of mice to determine (1) if the nucleotide substitutions differ from those generated during meiosis and (2) if the presence of nearby direct and inverted repeated sequences could template mutations around the variable gene. The results reveal a difference in the pattern of substitutions obtained from somatic mutations vs. me

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Dunson, David B., and Kenneth R. Tindall. "Bayesian Analysis of Mutational Spectra." Genetics 156, no. 3 (2000): 1411–18. http://dx.doi.org/10.1093/genetics/156.3.1411.

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Abstract Studies that examine both the frequency of gene mutation and the pattern or spectrum of mutational changes can be used to identify chemical mutagens and to explore the molecular mechanisms of mutagenesis. In this article, we propose a Bayesian hierarchical modeling approach for the analysis of mutational spectra. We assume that the total number of independent mutations and the numbers of mutations falling into different response categories, defined by location within a gene and/or type of alteration, follow binomial and multinomial sampling distributions, respectively. We use prior di

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Astudillo, H., J. Sanchez-Guillen, P. Romero-Garcia, et al. "Polymorphism detection of K-Ras mutations using high-resolution melting analysis in Mexican patients with metastatic colorectal cancer (mCRC)." Journal of Clinical Oncology 27, no. 15_suppl (2009): e15135-e15135. http://dx.doi.org/10.1200/jco.2009.27.15_suppl.e15135.

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e15135 Background: Metastatic carcinoma of the colorectum remains a major problem. Nowadays the mutational polymorphism detection of K-ras gene is useful for patients with diagnosis of mCRC especially when an anti-EGFR biological therapy is considered to be used. The purpose of this study was to analyze and establish a molecular method to detect the mutational polymorphism of K-Ras gene in paraffin-embedded biopsies from Mexican patients with mCRC. Methods: The presence and polymorphism of K-ras gene mutations were analyzed in paraffin-embedded biopsies from 156 patients using a real time PCR

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Piombino, Claudia, Angela Toss, Alessandra Bologna, et al. "The prognostic role of somatic BRCA mutations in ovarian cancer: Preliminary results from an observational multicenter cohort study." Journal of Clinical Oncology 38, no. 15_suppl (2020): e13674-e13674. http://dx.doi.org/10.1200/jco.2020.38.15_suppl.e13674.

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e13674 Background: BRCA germline (gBRCA) mutations occur in 11-15% of women with unselected ovarian cancers (OC), whereas somatic BRCA (sBRCA) mutations occur in approximately 5-7% of cases. The impact of sBRCA mutations on OC outcome is still debated. Methods: With the aim to explore the prognostic role of sBRCA mutations, the BRCA mutational status of 149 non-mucinous and non-borderline OC and their clinical-pathological features were evaluated. BRCA1 and BRCA2 mutational profiles, either for sequence variants or copy number alterations, were evaluated by amplicon next-generation sequencing

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Kuang, Shelley, Sally C. M. Lau, Kieran Sharma, et al. "Impact of KRAS mutational variant on response to immunotherapy in metastatic NSCLC." Journal of Clinical Oncology 39, no. 15_suppl (2021): e21127-e21127. http://dx.doi.org/10.1200/jco.2021.39.15_suppl.e21127.

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e21127 Background: KRAS alterations constitute the most common driver mutations in metastatic non-small cell lung cancers (mNSCLC) and occur in approximately 30% of patients. KRAS mutational subtype as well as the presence of co-mutations has been associated with altered activation of downstream signaling pathways in preclinical models. We hypothesize that different KRAS G12C mutational subsets will be associated with variable clinical outcome and response to therapy. To this end, we have performed a retrospective analysis of survival and treatment outcomes by KRAS mutation subtype (G12C vs no

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Borowczyk, Martyna, Ewelina Szczepanek-Parulska, Szymon Dębicki, et al. "High incidence of FLT3 mutations in follicular thyroid cancer: potential therapeutic target in patients with advanced disease stage." Therapeutic Advances in Medical Oncology 12 (January 2020): 175883592090753. http://dx.doi.org/10.1177/1758835920907534.

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Background: Conventional treatments for follicular thyroid cancer (FTC) can be ineffective, leading to poor prognosis. The aim of this study was to identify mutations associated with FTC that would serve as novel molecular markers of the disease and its outcome and could potentially identify new therapeutic targets. Methods: FLT3 mutations were first detected in a 29-year-old White female diagnosed with metastasized, treatment-refractory FTC. Analyses of FLT3 mutational status through next-generation sequencing of formalin-fixed, paraffin-embedded FTC specimens were subsequently performed in 3

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Zeineddine, Fadl, Benjamin Garmezy, Timothy A. Yap, and John Paul Y. C. Shen. "PMC: A more precise classifier of POLE mutations to identify candidates for immune therapy." Journal of Clinical Oncology 39, no. 15_suppl (2021): 3548. http://dx.doi.org/10.1200/jco.2021.39.15_suppl.3548.

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3548 Background: Specific somatic mutations in DNA polymerase epsilon ( POLE) can cause a hypermutant phenotype with tumor mutation burden (TMB) in excess of 100 mutations per megabase. It has been reported that POLE mutant tumors are enriched in response to immune therapy and this association is being tested in multiple active clinical trials. However, most POLE mutations are passenger mutations and have no pathogenic role. Current methods to classify POLE mutations are limited in both accuracy and completeness, which could lead to inappropriate use of immune agents in tumor such as MSS CRC,

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Jaffar, Nazish, Shahnaz Imdad Kehar, Aliya Zaman, Saadia Akram, and Kiran Abbas. "Spectrum of Tp53 gene mutation in basal cell carcinoma and its morphological subtypes in people of color." Professional Medical Journal 26, no. 10 (2019): 1783–88. http://dx.doi.org/10.29309/tpmj/2019.26.10.4141.

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Objectives: Basal cell carcinoma (BCC) is the most common cutaneous malignancy in white population. The pattern of exon specific p53 mutations in BCC and its subtypes remain undetected in our population. This study was designed to evaluate the prevalence and mutational spectrum of p53 mutations in basal cell carcinoma (BCC) and its subtypes in people of color in the population of Karachi, Pakistan. Study Design: Retrospective cross sectional study. Setting: Department of Pathology, Basic Medical Sciences Institute, Jinnah Post Graduate Medical Center Karachi, Pakistan. Period: Five-year study

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Machado, Heather E., Nina Friesgaard Øbro, Emily Mitchell, et al. "Life History of Normal Human Lymphocytes Revealed By Somatic Mutations." Blood 134, Supplement_1 (2019): 1045. http://dx.doi.org/10.1182/blood-2019-128188.

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Introduction: Mature blood cells harbor a mixture of mutations inherited from ancestral hematopoietic stem cells (HSCs) and mutations accumulated after maturation. The landscape of these somatic mutations in normal blood is poorly mapped, with questions as simple as "how many mutations does a memory T cell accumulate throughout life?" remaining unanswered. This gap in our knowledge is particularly relevant for hematopoietic malignancy- while we know that lymphomas derive from lymphocytes of particular stages of differentiation, we do not know if the patterns we see are reflected in their norma

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Lee, Ye Ji, Yejin Lee, Youn Jung Kim, Zang Hee Lee, and Jung-Wook Kim. "Novel PAX9 Mutations Causing Isolated Oligodontia." Journal of Personalized Medicine 14, no. 2 (2024): 191. http://dx.doi.org/10.3390/jpm14020191.

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Hypodontia, i.e., missing one or more teeth, is a relatively common human disease; however, oligodontia, i.e., missing six or more teeth, excluding the third molars, is a rare congenital disorder. Many genes have been shown to cause oligodontia in non-syndromic or syndromic conditions. In this study, we identified two novel PAX9 mutations in two non-syndromic oligodontia families. A mutational analysis identified a silent mutation (NM_006194.4: c.771G>A, p.(Gln257=)) in family 1 and a frameshift mutation caused by a single nucleotide duplication (c.637dup, p.(Asp213Glyfs*104)) in family 2.

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Stratton, Michael R. "Abstract PL02-01: The pathogenesis of cancer susceptibility due to inherited DNA repair defects." Cancer Research 82, no. 12_Supplement (2022): PL02–01—PL02–01. http://dx.doi.org/10.1158/1538-7445.am2022-pl02-01.

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Abstract The landscapes of somatic mutation in the genomes of normal human cells have, until recently, been poorly described compared with those of cancer cells. However, advances in technology are now changing this picture and are enabling exploration of the earliest stages of cancer development. In this talk, the patterns of somatic mutation found in normal colorectal epithelial cells are outlined and serve as a backdrop to understanding the pathogenesis of colorectal cancer susceptibility syndromes. Multiple mutational signatures are present in normal colorectal epithelial cells indicating

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Jeffers, Michael, Christian Kappeler, Iris Kuss, et al. "Broad spectrum of regorafenib activity on mutant KIT and absence of clonal selection in gastrointestinal stromal tumor (GIST): correlative analysis from the GRID trial." Gastric Cancer 25, no. 3 (2022): 598–608. http://dx.doi.org/10.1007/s10120-021-01274-6.

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Abstract Background In the phase 3 GRID trial, regorafenib improved progression-free survival (PFS) independent of KIT mutations in exons 9 and 11. In this retrospective, exploratory analysis of the GRID trial, we investigated whether a more comprehensive KIT mutation analysis could identify mutations that impact treatment outcome with regorafenib and a regorafenib-induced mutation pattern. Methods Archived tumor samples, collected at any time prior to enrollment in GRID, were analyzed by Sanger sequencing (n = 102) and next-generation sequencing (FoundationONE; n = 47). Plasma samples collect

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Xu, Hong-Tao, Maureen Oliveira, Peter K. Quashie, et al. "Subunit-Selective Mutational Analysis and Tissue Culture Evaluations of the Interactions of the E138K and M184I Mutations in HIV-1 Reverse Transcriptase." Journal of Virology 86, no. 16 (2012): 8422–31. http://dx.doi.org/10.1128/jvi.00271-12.

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Abstract (sommario):

The emergence of HIV-1 drug resistance remains a major obstacle in antiviral therapy. M184I/V and E138K are signature mutations of clinical relevance in HIV-1 reverse transcriptase (RT) for the nucleoside reverse transcriptase inhibitors (NRTIs) lamivudine (3TC) and emtricitabine (FTC) and the second-generation (new) nonnucleoside reverse transcriptase inhibitor (NNRTI) rilpivirine (RPV), respectively, and the E138K mutation has also been shown to be selected by etravirine in cell culture. The E138K mutation was recently shown to compensate for the low enzyme processivity and viral fitness ass

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Juriloff, D. M., S. D. Porter, and M. J. Harris. "Three spontaneous mutations at the albino locus in SELH/Bc mice." Genome 37, no. 2 (1994): 190–97. http://dx.doi.org/10.1139/g94-026.

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The SELH/Bc inbred mouse stock has produced an unusually high number of spontaneous mutations, including sph2Bc, nuBc, a recessive lens opacity, and three mutations at the c locus. Classical genetic and molecular genetic studies were done to investigate the origin of the albino locus mutations. Southern blots probed with the mouse tyrosinase cDNA showed that two of the mutations, cBc and c2Bc, are deletions of exons 1, 2 and 3. The third mutation, c3Bc, showed a disruption, either a rearrangement or an insertion, in the region of exon 1. The deletion of the cBc mutation is anticipated to be la

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Ohshima, Hidemi, Eiji Kobayashi, Manabu Inaba, et al. "HRAS Mutations in Head and Neck Carcinomas in Japanese Patients: Clinical Significance, Prognosis, and Therapeutic Potential." International Journal of Molecular Sciences 26, no. 7 (2025): 3093. https://doi.org/10.3390/ijms26073093.

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It is well known that a number of head and neck carcinomas are associated with HRAS mutations, and that several cancers with RAS mutations, such as lung cancer, have a poor prognosis. In this study, we evaluated the frequency of HRAS mutations in head and neck carcinomas and characterized the clinical and cell biological features of carcinomas with HRAS mutations. HRAS mutations at codons 12, 13, and 61, mutational hot spots, were evaluated in tissue specimens obtained from 119 Japanese patients treated at our institution. DNA was successfully extracted from 100 specimens, and sequencing was c

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Maldonado, J. Alberto, Chin-Hsien Tai, and Christine Alewine. "Genomic characterization of somatic mutations by race and ethnicity in pancreatic cancer defined through AACR project GENIE." Journal of Clinical Oncology 41, no. 16_suppl (2023): 4138. http://dx.doi.org/10.1200/jco.2023.41.16_suppl.4138.

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4138 Background: KRAS, TP53, SMAD4, and CDKN2A are widely recognized as the most common somatic mutations amongst patients with pancreatic ductal adenocarcinoma (PDAC); however, previous genomic studies have disproportionately included non-Hispanic White (NHW) patients with little to no inclusion of racial and ethnic minorities, particularly non-Hispanic Black (NHB) and Hispanic patients. Additionally, little is known about the distribution of KRAS point mutations in PDAC in specific racial and ethnic groups. Here, we describe somatic mutation differences in a larger and more racially and ethn

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Lin, Selena Y., Ting-Tsung Chang, Jamin D. Steffen, et al. "Detection of CTNNB1 Hotspot Mutations in Cell-Free DNA from the Urine of Hepatocellular Carcinoma Patients." Diagnostics 11, no. 8 (2021): 1475. http://dx.doi.org/10.3390/diagnostics11081475.

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Hepatocellular carcinoma (HCC) is a leading cause of cancer-related deaths worldwide. The beta-catenin gene, CTNNB1, is among the most frequently mutated in HCC tissues. However, mutational analysis of HCC tumors is hampered by the difficulty of obtaining tissue samples using traditional biopsy. Here, we explored the feasibility of detecting tumor-derived CTNNB1 mutations in cell-free DNA (cfDNA) extracted from the urine of HCC patients. Using a short amplicon qPCR assay targeting HCC mutational hotspot CTNNB1 codons 32–37 (exon 3), we detected CTNNB1 mutations in 25% (18/73) of HCC tissues an

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Patterson, Andrew, Abdurrahman Elbasir, Bin Tian, and Noam Auslander. "Computational Methods Summarizing Mutational Patterns in Cancer: Promise and Limitations for Clinical Applications." Cancers 15, no. 7 (2023): 1958. http://dx.doi.org/10.3390/cancers15071958.

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Since the rise of next-generation sequencing technologies, the catalogue of mutations in cancer has been continuously expanding. To address the complexity of the cancer-genomic landscape and extract meaningful insights, numerous computational approaches have been developed over the last two decades. In this review, we survey the current leading computational methods to derive intricate mutational patterns in the context of clinical relevance. We begin with mutation signatures, explaining first how mutation signatures were developed and then examining the utility of studies using mutation signa

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Wiens, G. D., K. A. Heldwein, M. P. Stenzel-Poore, and M. B. Rittenberg. "Somatic mutation in VH complementarity-determining region 2 and framework region 2: differential effects on antigen binding and Ig secretion." Journal of Immunology 159, no. 3 (1997): 1293–302. http://dx.doi.org/10.4049/jimmunol.159.3.1293.

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Abstract The extent to which somatic mutation impairs the Ig complementarity-determining region (CDR) and framework region (FRW) structure/function is not clear. Previously, we found that the VH CDR2 of the murine T15 Ab is highly sensitive to mutation; 56% (26 of 46) of Abs mutated in vitro had reduced or no Ag binding capability, and 9% were secretion impaired. Here we test whether the T15 VH CDR2 structure is unique by mutating the VH CDR2 of the anti-PC-protein murine Ab, PCG1-1. PCG1-1 VH is encoded by the M141 gene and is unrelated in sequence or structure to that of T15 VH1. The majorit

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Hwang, Tae Sook, Wook Youn Kim, Hye Seung Han, et al. "Preoperative RAS Mutational Analysis Is of Great Value in Predicting Follicular Variant of Papillary Thyroid Carcinoma." BioMed Research International 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/697068.

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Abstract (sommario):

Follicular variant of papillary thyroid carcinoma (FVPTC), particularly the encapsulated subtype, often causes a diagnostic dilemma. We reconfirmed the molecular profiles in a large number of FVPTCs and investigated the efficacy of the preoperative mutational analysis in indeterminate thyroid nodules. BRAF V600E/K601E and RAS mutational analysis was performed on 187 FVPTCs. Of these, 132 (70.6%) had a point mutation in one of the BRAF V600E (n=57), BRAF K601E (n=11), or RAS (n=64) genes. All mutations were mutually exclusive. The most common RAS mutations were at NRAS codon 61. FNA aspirates f

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Thomas, Renjan, Gautam Balaram, Hrishi Varayathu, et al. "Molecular epidemiology and clinical characteristics of epidermal growth factor receptor mutations in NSCLC: A single-center experience from India." Journal of Cancer Research and Therapeutics 19, no. 5 (2023): 1398–406. http://dx.doi.org/10.4103/jcrt.jcrt_1986_21.

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ABSTRACT Background: The genetic profiling of non-small cell lung cancer (NSCLC) has contributed to the discovery of actionable targetable mutations, which have significantly improved outcomes in disease with poor prognosis. Molecular epidemiological data of driver mutations in Indian populations have not been extensively elaborated compared to western and eastern Asian NSCLC populations. This study assessed the prevalence and clinical outcomes of EGFR (epidermal growth factor receptor) mutations among the Indian NSCLC cohort in South India. Patients and Methods: Retrospective analysis of 2,00

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Li, Hongxia, Qianqian Duan, and Yuan Tan. "Somatic and germline mutation profiles of Chinese young colorectal cancer patients." Journal of Clinical Oncology 39, no. 15_suppl (2021): e15522-e15522. http://dx.doi.org/10.1200/jco.2021.39.15_suppl.e15522.

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e15522 Background: In recently years, although CRC morbidity and mortality can be mitigated through appropriate screening and surveillance, the incidence rate of colorectal cancer (CRC) younger than 50 years old increased annually. Limited studies have investigated the underpinnings driving CRC development in Chinese younger population. In our study, we aim to explore the comprehensive mutational profile of Chinese CRC patients old (＞50) and young (≤50) diagnosed with CRC. Methods: Targeted sequencing with a 539 cancer-related genes panel was performed on 235 patients diagnosed with CRC. We in

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Alohali, Sama, Alexandra E. Payne, Marc Pusztaszeri, et al. "Effect of Having Concurrent Mutations on the Degree of Aggressiveness in Patients with Thyroid Cancer Positive for TERT Promoter Mutations." Cancers 15, no. 2 (2023): 413. http://dx.doi.org/10.3390/cancers15020413.

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This study aimed to examine whether concurrent mutations with a TERT promoter mutation are associated with a greater likelihood of more aggressive disease than a TERT promoter mutation alone. The medical records of 1477 patients who underwent thyroid surgery at two tertiary hospitals between 2017 and 2022 were reviewed. Twenty-four patients had TERT promoter mutations based on molecular profile testing. Clinicodemographic data, mutational profiles, and histopathological features were assessed. Descriptive analysis, Fisher’s exact test, and binary logistic regression were performed. Seven patie

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Ito-Harashima, Sayoko, Phillip E. Hartzog, Himanshu Sinha, and John H. McCusker. "The tRNA-Tyr Gene Family ofSaccharomyces cerevisiae: Agents of Phenotypic Variation and Position Effects on Mutation Frequency." Genetics 161, no. 4 (2002): 1395–410. http://dx.doi.org/10.1093/genetics/161.4.1395.

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AbstractExtensive phenotypic diversity or variation exists in clonal populations of microorganisms and is thought to play a role in adaptation to novel environments. This phenotypic variation or instability, which occurs by multiple mechanisms, may be a form of cellular differentiation and a stochastic means for modulating gene expression. This work dissects a case of phenotypic variation in a clinically derived Saccharomyces cerevisiae strain involving a cox15 ochre mutation, which acts as a reporter. The ochre mutation reverts to sense at a low frequency while tRNA-Tyr ochre suppressors (SUP

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