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https://www.readbyqxmd.com/read/28717061/apobec-mediated-genomic-alterations-link-immunity-and-viral-infection-during-human-papillomavirus-driven-cervical-carcinogenesis
#1
Lanting Chen, Xuemin Qiu, Na Zhang, Yan Wang, Mingyan Wang, Dajin Li, Ling Wang, Yan Du
Cervical cancer is one of the most frequently diagnosed cancers and is a major cause of death from gynecologic cancers worldwide; the cancer burden from cervical cancer is especially heavy in less developed countries. Most cases of cervical cancer are caused by persistent infection with carcinogenic human papillomavirus (HPV) genotypes 16 and 18. Non-resolving inflammation caused by HPV infection provides a microenvironment that facilitates cancer development. Molecular alterations during the process of HPV-induced carcinogenesis are characterized by DNA methylation within the HPV genome, promoter hypermethylation of tumor suppressor genes in the host genome, as well as genomic instability caused by viral DNA integrating into the host genome...
July 17, 2017: Bioscience Trends
https://www.readbyqxmd.com/read/28698210/apobec3a-and-3b-activities-render-cancer-cells-susceptible-to-atr-inhibition
#2
Remi Buisson, Michael S Lawrence, Cyril H Benes, Lee Zou
The apolipoprotein B mRNA editing enzyme catalytic polypeptide-like APOBEC3A and 3B have emerged as key mutation drivers in cancer. Here we show that APOBEC3A and 3B activities impose a unique type of replication stress by inducing abasic sites at replication forks. In contrast to cells under other types of replication stress, APOBEC3A-expressing cells were selectively sensitive to ATR inhibitors (ATRi), but not to a variety of DNA replication inhibitors and DNA-damaging drugs. In proliferating cells, APOBEC3A modestly elicited ATR but not ATM...
July 11, 2017: Cancer Research
https://www.readbyqxmd.com/read/28639893/apobec-1-complementation-factor-regulates-cell-migration-and-apoptosis-through-dickkopf1-by-acting-on-its-3-untranslated-region-in-mcf7-cells
#3
Xin Yan, Qianyin Li, Dongsheng Ni, Yajun Xie, Qingling He, Qianya Wan, Yamin Liu, Zhongshi Lyu, Zhaomin Mao, Qin Zhou
A1CF (apobec-1 complementation factor) acts as a component of the apolipoprotein-B messenger RNA editing complex. Previous researches mainly focused on its post-transcriptional cytidine to uridine RNA editing. However, few study reported its role in progression of breast carcinoma cells. Wound healing assay and flow cytometry were applied to detect the migration and apoptosis; western blot, real-time polymerase chain reaction, and dual-luciferase assays were applied to investigate the potential regulation mechanism of A1CF-mediated cell migration and apoptosis...
June 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28637869/heat-shock-proteins-stimulate-apobec-3-mediated-cytidine-deamination-in-the-hepatitis-b-virus
#4
Zhigang Chen, Thomas L Eggerman, Alexander V Bocharov, Irina N Baranova, Tatyana G Vishnyakova, Roger Kurlander, Amy P Patterson
Apolipoprotein B mRNA-editing enzyme catalytic subunit 3 (APOBEC-3) enzymes are cytidine deaminases that are broadly and constitutively expressed. They are often upregulated during carcinogenesis and candidate genes for causing the major single-base substitution in cancer-associated DNA mutations. Moreover, APOBEC-3s are involved in host innate immunity against many viruses. However, how APOBEC-3 mutational activity is regulated in normal and pathological conditions remains largely unknown. Heat shock protein levels are often elevated in both carcinogenesis and viral infection and are associated with DNA mutations...
June 21, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28604942/micrornas-regulate-apobec-gene-expression
#5
REVIEW
Wei Cao, Wei Wu
Apolipoprotein B mRNA editing enzyme, catalytic polypeptide-like (APOBEC) is a family of evolutionarily conserved cytidine deaminases, encoded by eleven genes located in the human genome. APOBECs play key roles in innate immunity through their ability to mutagenize viral DNA and restrict rival replication. Recent cancer genomics revealed APOBEC3 subtype-mediated APOBEC-signature mutations are common in a broad spectrum of human cancers. The pervasive APOBEC3 activation in the host genome which converts cytosine to uracile during RNA editing has been suggested to depend on ATR/chk1 pathways...
June 12, 2017: Histology and Histopathology
https://www.readbyqxmd.com/read/28601352/comprehensive-genomic-characterization-of-upper-tract-urothelial-carcinoma
#6
Tyler J Moss, Yuan Qi, Liu Xi, Bo Peng, Tae-Beom Kim, Nader E Ezzedine, Maribel E Mosqueda, Charles C Guo, Bogdan A Czerniak, Michael Ittmann, David A Wheeler, Seth P Lerner, Surena F Matin
BACKGROUND: Upper urinary tract urothelial cancer (UTUC) may have unique etiologic and genomic factors compared to bladder cancer. OBJECTIVE: To characterize the genomic landscape of UTUC and provide insights into its biology using comprehensive integrated genomic analyses. DESIGN, SETTING, AND PARTICIPANTS: We collected 31 untreated snap-frozen UTUC samples from two institutions and carried out whole-exome sequencing (WES) of DNA, RNA sequencing (RNAseq), and protein analysis...
June 7, 2017: European Urology
https://www.readbyqxmd.com/read/28498782/clonal-history-and-genetic-predictors-of-transformation-into-small-cell-carcinomas-from-lung-adenocarcinomas
#7
June-Koo Lee, Junehawk Lee, Sehui Kim, Soyeon Kim, Jeonghwan Youk, Seongyeol Park, Yohan An, Bhumsuk Keam, Dong-Wan Kim, Dae Seog Heo, Young Tae Kim, Jin-Soo Kim, Se Hyun Kim, Jong Seok Lee, Se-Hoon Lee, Keunchil Park, Ja-Lok Ku, Yoon Kyung Jeon, Doo Hyun Chung, Peter J Park, Joon Kim, Tae Min Kim, Young Seok Ju
Purpose Histologic transformation of EGFR mutant lung adenocarcinoma (LADC) into small-cell lung cancer (SCLC) has been described as one of the major resistant mechanisms for epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKIs). However, the molecular pathogenesis is still unclear. Methods We investigated 21 patients with advanced EGFR-mutant LADCs that were transformed into EGFR TKI-resistant SCLCs. Among them, whole genome sequencing was applied for nine tumors acquired at various time points from four patients to reconstruct their clonal evolutionary history and to detect genetic predictors for small-cell transformation...
May 12, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28479091/family-wide-comparative-analysis-of-cytidine-and-methylcytidine-deamination-by-eleven-human-apobec-proteins
#8
Fumiaki Ito, Yang Fu, Shen-Chi A Kao, Hanjing Yang, Xiaojiang S Chen
Apolipoprotein B mRNA editing enzyme, catalytic polypeptide-like (APOBEC) proteins are a family of cytidine deaminases involved in various important biological processes such as antibody diversification/maturation, restriction of viral infection, and generation of somatic mutations. Catalytically active APOBEC proteins execute their biological functions mostly through deaminating cytosine (C) to uracil on single-stranded DNA/RNA. Activation-induced cytidine deaminase, one of the APOBEC members, was reported to deaminate methylated cytosine (mC) on DNA, and this mC deamination was proposed to be involved in the demethylation of mC for epigenetic regulation...
June 16, 2017: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28472485/apobec3a-efficiently-deaminates-methylated-but-not-tet-oxidized-cytosine-bases-in-dna
#9
Emily K Schutsky, Christopher S Nabel, Amy K F Davis, Jamie E DeNizio, Rahul M Kohli
AID/APOBEC family enzymes are best known for deaminating cytosine bases to uracil in single-stranded DNA, with characteristic sequence preferences that can produce mutational signatures in targets such as retroviral and cancer cell genomes. These deaminases have also been proposed to function in DNA demethylation via deamination of either 5-methylcytosine (mC) or TET-oxidized mC bases (ox-mCs), which include 5-hydroxymethylcytosine, 5-formylcytosine and 5-carboxylcytosine. One specific family member, APOBEC3A (A3A), has been shown to readily deaminate mC, raising the prospect of broader activity on ox-mCs...
May 2, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28439266/a-novel-regulator-of-activation-induced-cytidine-deaminase-apobecs-in-immunity-and-cancer-schr%C3%A3-dinger-s-catalytic-pocket
#10
REVIEW
Justin J King, Mani Larijani
Activation-induced cytidine deaminase (AID) and its relative APOBEC3 cytidine deaminases boost immune response by mutating immune or viral genes. Because of their genome-mutating activities, AID/APOBECs are also drivers of tumorigenesis. Due to highly charged surfaces, extensive non-specific protein-protein/nucleic acid interactions, formation of polydisperse oligomers, and general insolubility, structure elucidation of these proteins by X-ray crystallography and NMR has been challenging. Hence, almost all available AID/APOBEC structures are of mutated and/or truncated versions...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28436987/genomic-consequences-of-aberrant-dna-repair-mechanisms-stratify-ovarian-cancer-histotypes
#11
Yi Kan Wang, Ali Bashashati, Michael S Anglesio, Dawn R Cochrane, Diljot S Grewal, Gavin Ha, Andrew McPherson, Hugo M Horlings, Janine Senz, Leah M Prentice, Anthony N Karnezis, Daniel Lai, Mohamed R Aniba, Allen W Zhang, Karey Shumansky, Celia Siu, Adrian Wan, Melissa K McConechy, Hector Li-Chang, Alicia Tone, Diane Provencher, Manon de Ladurantaye, Hubert Fleury, Aikou Okamoto, Satoshi Yanagida, Nozomu Yanaihara, Misato Saito, Andrew J Mungall, Richard Moore, Marco A Marra, C Blake Gilks, Anne-Marie Mes-Masson, Jessica N McAlpine, Samuel Aparicio, David G Huntsman, Sohrab P Shah
We studied the whole-genome point mutation and structural variation patterns of 133 tumors (59 high-grade serous (HGSC), 35 clear cell (CCOC), 29 endometrioid (ENOC), and 10 adult granulosa cell (GCT)) as a substrate for class discovery in ovarian cancer. Ab initio clustering of integrated point mutation and structural variation signatures identified seven subgroups both between and within histotypes. Prevalence of foldback inversions identified a prognostically significant HGSC group associated with inferior survival...
June 2017: Nature Genetics
https://www.readbyqxmd.com/read/28433662/iron-and-thiol-redox-signaling-in-cancer-an-exquisite-balance-to-escape-ferroptosis
#12
REVIEW
Shinya Toyokuni, Fumiya Ito, Kyoko Yamashita, Yasumasa Okazaki, Shinya Akatsuka
Epidemiological data indicate a constant worldwide increase in cancer mortality, although the age of onset is increasing. Recent accumulation of genomic data on human cancer via next-generation sequencing confirmed that cancer is a disease of genome alteration. In many cancers, the Nrf2 transcription system is activated via mutations either in Nrf2 or Keap1 ubiquitin ligase, leading to persistent activation of the genes with antioxidative functions. Furthermore, deep sequencing of passenger mutations is clarifying responsible cancer causative agent(s) in each case, including aging, APOBEC activation, smoking and UV...
April 19, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28419182/molecular-classification-of-pulmonary-sarcomatoid-carcinomas-suggests-new-therapeutic-opportunities
#13
N Pécuchet, T Vieira, N Rabbe, M Antoine, H Blons, J Cadranel, P Laurent-Puig, M Wislez
Background: Pulmonary sarcomatoid carcinoma (SC) is a rare disease with poor prognosis and with strong inter- and intratumor heterogeneity. However, molecular classification is currently focused on activating MET mutations. We sought to better characterize the molecular diversity of SC using mutational signatures that reflect different mutational processes, such as tobacco-associated adducts (signature 4), BRCA1/BRCA2 deficiency (signature 3) or APOBEC enzyme deamination (signatures 2&13)...
April 13, 2017: Annals of Oncology: Official Journal of the European Society for Medical Oncology
https://www.readbyqxmd.com/read/28405512/high-expression-of-pd-1-ligands-is-associated-with-kataegis-mutational-signature-and-apobec3-alterations
#14
Amélie Boichard, Igor F Tsigelny, Razelle Kurzrock
Immunotherapy with checkpoint inhibitors, such as antibodies blocking the programmed cell-death receptor-1 (PD-1), has resulted in remarkable responses in patients having traditionally refractory cancers. Although response to PD-1 inhibitors correlates with PD-1 ligand (PD-L1 or PD-L2) expression, PD-1 ligand positivity represents only a part of the predictive model necessary for selecting patients predisposed to respond to immunotherapy. We used all genomic, transcriptomic, proteomic and phenotypic data related to 8,475 pan-cancer samples available in The Cancer Genome Atlas (TCGA) and conducted a logistic regression analysis based on a large set of variables, such as microsatellite instability (MSI-H), mismatch repair (MMR) alterations, polymerase δ (POLD1) and polymerase ε (POLE) mutations, activation-induced/apolipoprotein-B editing cytidine deaminases (AID/APOBEC) alterations, lymphocyte markers and mutation burden estimates to determine independent factors that associate with PD-1 ligand overexpression...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/28381554/dna-mutagenic-activity-and-capacity-for-hiv-1-restriction-of-the-cytidine-deaminase-apobec3g-depend-on-whether-dna-or-rna-binds-to-tyrosine-315
#15
Bogdan Polevoda, Rebecca Joseph, Alan E Friedman, Ryan P Bennett, Rebecca Greiner, Thareendra De Zoysa, Ryan A Stewart, Harold C Smith
APOBEC3G (A3G) belongs to the AID/APOBEC protein family of cytidine deaminases (CDA) that bind to nucleic acids. A3G mutates the HIV genome by deamination of dC to dU, leading to accumulation of virus-inactivating mutations. Binding to cellular RNAs inhibits A3G binding to substrate single-stranded (ss) DNA and CDA activity. Bulk RNA and substrate ssDNA bind to the same three A3G tryptic peptides (amino acids 181-194, 314-320, and 345-374) that form parts of a continuously exposed protein surface extending from the catalytic domain in the C terminus of A3G to its N terminus...
May 26, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28365443/genetic-alterations-in-esophageal-tissues-from-squamous-dysplasia-to-carcinoma
#16
Xi Liu, Min Zhang, Songmin Ying, Chong Zhang, Runhua Lin, Jiaxuan Zheng, Guohong Zhang, Dongping Tian, Yi Guo, Caiwen Du, Yuping Chen, Shaobin Chen, Xue Su, Juan Ji, Wanting Deng, Xiang Li, Shiyue Qiu, Ruijing Yan, Zexin Xu, Yuan Wang, Yuanning Guo, Jiancheng Cui, Shanshan Zhuang, Huan Yu, Qi Zheng, Moshe Marom, Sitong Sheng, Guoqiang Zhang, Songnian Hu, Ruiqiang Li, Min Su
BACKGROUND & AIMS: Esophageal squamous cell carcinoma (ESCC) is the most common subtype of esophageal cancer. Little is known about the genetic changes that occur in esophageal cells during the development of ESCC. We performed next-generation sequence analyses of esophageal nontumor, intraepithelial neoplasia (IEN), and ESCC tissues from the same patients to track genetic changes during tumor development. METHODS: We performed whole-genome, exome, or targeted sequence analyses of 227 esophageal tissue samples from 70 patients with ESCC undergoing resection at Shantou University Medical College in China from 2012 through 2015 (no patients had received chemotherapy or radiation therapy); we analyzed normal tissue, tissue with simple hyperplasia, dysplastic tissue (IEN), and ESCC tissues collected from different regions of the esophagus at the same time...
March 30, 2017: Gastroenterology
https://www.readbyqxmd.com/read/28362825/the-preferred-nucleotide-contexts-of-the-aid-apobec-cytidine-deaminases-have-differential-effects-when-mutating-retrotransposon-and-virus-sequences-compared-to-host-genes
#17
Jeffrey Chen, Thomas MacCarthy
The AID / APOBEC genes are a family of cytidine deaminases that have evolved in vertebrates, and particularly mammals, to mutate RNA and DNA at distinct preferred nucleotide contexts (or "hotspots") on foreign genomes such as viruses and retrotransposons. These enzymes play a pivotal role in intrinsic immunity defense mechanisms, often deleteriously mutating invading retroviruses or retrotransposons and, in the case of AID, changing antibody sequences to drive affinity maturation. We investigate the strength of various hotspots on their known biological targets by evaluating the potential impact of mutations on the DNA coding sequences of these targets, and compare these results to hypothetical hotspots that did not evolve...
March 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28334887/avoidance-of-apobec3b-induced-mutation-by-error-free-lesion-bypass
#18
James I Hoopes, Amber L Hughes, Lauren A Hobson, Luis M Cortez, Alexander J Brown, Steven A Roberts
APOBEC cytidine deaminases mutate cancer genomes by converting cytidines into uridines within ssDNA during replication. Although uracil DNA glycosylases limit APOBEC-induced mutation, it is unknown if subsequent base excision repair (BER) steps function on replication-associated ssDNA. Hence, we measured APOBEC3B-induced CAN1 mutation frequencies in yeast deficient in BER endonucleases or DNA damage tolerance proteins. Strains lacking Apn1, Apn2, Ntg1, Ntg2 or Rev3 displayed wild-type frequencies of APOBEC3B-induced canavanine resistance (CanR)...
May 19, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28266028/triggering-of-tlr-3-4-nod2-and-dc-sign-reduces-viral-replication-and-increases-t-cell-activation-capacity-of-hiv-infected-human-dendritic-cells
#19
Sylvain Cardinaud, Alejandra Urrutia, Angeline Rouers, Pierre-Grégoire Coulon, Jérome Kervevan, Clémence Richetta, Anne Bet, Emmanuel A Maze, Martin Larsen, Maria-Candela Iglesias, Victor Appay, Stéphanie Graff-Dubois, Arnaud Moris
A variety of signals influence the capacity of dendritic cells (DCs) to mount potent antiviral cytotoxic T-cell (CTL) responses. In particular, innate immune sensing by pathogen recognition receptors, such as TLR and C-type lectines, influences DC biology and affects their susceptibility to HIV infection. Yet, whether the combined effects of PPRs triggering and HIV infection influence HIV-specific (HS) CTL responses remain enigmatic. Here, we dissect the impact of innate immune sensing by pathogen recognition receptors on DC maturation, HIV infection, and on the quality of HS CTL activation...
May 2017: European Journal of Immunology
https://www.readbyqxmd.com/read/28260788/apobec-signature-mutation-generates-an-oncogenic-enhancer-that-drives-lmo1-expression-in-t-all
#20
Z Li, B J Abraham, A Berezovskaya, N Farah, Y Liu, T Leon, A Fielding, S H Tan, T Sanda, A S Weintraub, B Li, S Shen, J Zhang, M R Mansour, R A Young, A T Look
Oncogenic driver mutations are those that provide a proliferative or survival advantage to neoplastic cells, resulting in clonal selection. Although most cancer-causing mutations have been detected in the protein-coding regions of the cancer genome; driver mutations have recently also been discovered within noncoding genomic sequences. Thus, a current challenge is to gain precise understanding of how these unique genomic elements function in cancer pathogenesis, while clarifying mechanisms of gene regulation and identifying new targets for therapeutic intervention...
March 28, 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
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