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1.  DNA Glycosylases Involved in Base Excision Repair May Be Associated with Cancer Risk in BRCA1 and BRCA2 Mutation Carriers 
Osorio, Ana | Milne, Roger L. | Kuchenbaecker, Karoline | Vaclová, Tereza | Pita, Guillermo | Alonso, Rosario | Peterlongo, Paolo | Blanco, Ignacio | de la Hoya, Miguel | Duran, Mercedes | Díez, Orland | Ramón y Cajal, Teresa | Konstantopoulou, Irene | Martínez-Bouzas, Cristina | Andrés Conejero, Raquel | Soucy, Penny | McGuffog, Lesley | Barrowdale, Daniel | Lee, Andrew | SWE-BRCA,  | Arver, Brita | Rantala, Johanna | Loman, Niklas | Ehrencrona, Hans | Olopade, Olufunmilayo I. | Beattie, Mary S. | Domchek, Susan M. | Nathanson, Katherine | Rebbeck, Timothy R. | Arun, Banu K. | Karlan, Beth Y. | Walsh, Christine | Lester, Jenny | John, Esther M. | Whittemore, Alice S. | Daly, Mary B. | Southey, Melissa | Hopper, John | Terry, Mary B. | Buys, Saundra S. | Janavicius, Ramunas | Dorfling, Cecilia M. | van Rensburg, Elizabeth J. | Steele, Linda | Neuhausen, Susan L. | Ding, Yuan Chun | Hansen, Thomas v. O. | Jønson, Lars | Ejlertsen, Bent | Gerdes, Anne-Marie | Infante, Mar | Herráez, Belén | Moreno, Leticia Thais | Weitzel, Jeffrey N. | Herzog, Josef | Weeman, Kisa | Manoukian, Siranoush | Peissel, Bernard | Zaffaroni, Daniela | Scuvera, Giulietta | Bonanni, Bernardo | Mariette, Frederique | Volorio, Sara | Viel, Alessandra | Varesco, Liliana | Papi, Laura | Ottini, Laura | Tibiletti, Maria Grazia | Radice, Paolo | Yannoukakos, Drakoulis | Garber, Judy | Ellis, Steve | Frost, Debra | Platte, Radka | Fineberg, Elena | Evans, Gareth | Lalloo, Fiona | Izatt, Louise | Eeles, Ros | Adlard, Julian | Davidson, Rosemarie | Cole, Trevor | Eccles, Diana | Cook, Jackie | Hodgson, Shirley | Brewer, Carole | Tischkowitz, Marc | Douglas, Fiona | Porteous, Mary | Side, Lucy | Walker, Lisa | Morrison, Patrick | Donaldson, Alan | Kennedy, John | Foo, Claire | Godwin, Andrew K. | Schmutzler, Rita Katharina | Wappenschmidt, Barbara | Rhiem, Kerstin | Engel, Christoph | Meindl, Alfons | Ditsch, Nina | Arnold, Norbert | Plendl, Hans Jörg | Niederacher, Dieter | Sutter, Christian | Wang-Gohrke, Shan | Steinemann, Doris | Preisler-Adams, Sabine | Kast, Karin | Varon-Mateeva, Raymonda | Gehrig, Andrea | Stoppa-Lyonnet, Dominique | Sinilnikova, Olga M. | Mazoyer, Sylvie | Damiola, Francesca | Poppe, Bruce | Claes, Kathleen | Piedmonte, Marion | Tucker, Kathy | Backes, Floor | Rodríguez, Gustavo | Brewster, Wendy | Wakeley, Katie | Rutherford, Thomas | Caldés, Trinidad | Nevanlinna, Heli | Aittomäki, Kristiina | Rookus, Matti A. | van Os, Theo A. M. | van der Kolk, Lizet | de Lange, J. L. | Meijers-Heijboer, Hanne E. J. | van der Hout, A. H. | van Asperen, Christi J. | Gómez Garcia, Encarna B. | Hoogerbrugge, Nicoline | Collée, J. Margriet | van Deurzen, Carolien H. M. | van der Luijt, Rob B. | Devilee, Peter | HEBON,  | Olah, Edith | Lázaro, Conxi | Teulé, Alex | Menéndez, Mireia | Jakubowska, Anna | Cybulski, Cezary | Gronwald, Jacek | Lubinski, Jan | Durda, Katarzyna | Jaworska-Bieniek, Katarzyna | Johannsson, Oskar Th. | Maugard, Christine | Montagna, Marco | Tognazzo, Silvia | Teixeira, Manuel R. | Healey, Sue | Investigators, kConFab | Olswold, Curtis | Guidugli, Lucia | Lindor, Noralane | Slager, Susan | Szabo, Csilla I. | Vijai, Joseph | Robson, Mark | Kauff, Noah | Zhang, Liying | Rau-Murthy, Rohini | Fink-Retter, Anneliese | Singer, Christian F. | Rappaport, Christine | Geschwantler Kaulich, Daphne | Pfeiler, Georg | Tea, Muy-Kheng | Berger, Andreas | Phelan, Catherine M. | Greene, Mark H. | Mai, Phuong L. | Lejbkowicz, Flavio | Andrulis, Irene | Mulligan, Anna Marie | Glendon, Gord | Toland, Amanda Ewart | Bojesen, Anders | Pedersen, Inge Sokilde | Sunde, Lone | Thomassen, Mads | Kruse, Torben A. | Jensen, Uffe Birk | Friedman, Eitan | Laitman, Yael | Shimon, Shani Paluch | Simard, Jacques | Easton, Douglas F. | Offit, Kenneth | Couch, Fergus J. | Chenevix-Trench, Georgia | Antoniou, Antonis C. | Benitez, Javier
PLoS Genetics  2014;10(4):e1004256.
Single Nucleotide Polymorphisms (SNPs) in genes involved in the DNA Base Excision Repair (BER) pathway could be associated with cancer risk in carriers of mutations in the high-penetrance susceptibility genes BRCA1 and BRCA2, given the relation of synthetic lethality that exists between one of the components of the BER pathway, PARP1 (poly ADP ribose polymerase), and both BRCA1 and BRCA2. In the present study, we have performed a comprehensive analysis of 18 genes involved in BER using a tagging SNP approach in a large series of BRCA1 and BRCA2 mutation carriers. 144 SNPs were analyzed in a two stage study involving 23,463 carriers from the CIMBA consortium (the Consortium of Investigators of Modifiers of BRCA1 and BRCA2). Eleven SNPs showed evidence of association with breast and/or ovarian cancer at p<0.05 in the combined analysis. Four of the five genes for which strongest evidence of association was observed were DNA glycosylases. The strongest evidence was for rs1466785 in the NEIL2 (endonuclease VIII-like 2) gene (HR: 1.09, 95% CI (1.03–1.16), p = 2.7×10−3) for association with breast cancer risk in BRCA2 mutation carriers, and rs2304277 in the OGG1 (8-guanine DNA glycosylase) gene, with ovarian cancer risk in BRCA1 mutation carriers (HR: 1.12 95%CI: 1.03–1.21, p = 4.8×10−3). DNA glycosylases involved in the first steps of the BER pathway may be associated with cancer risk in BRCA1/2 mutation carriers and should be more comprehensively studied.
Author Summary
Women harboring a germ-line mutation in the BRCA1 or BRCA2 genes have a high lifetime risk to develop breast and/or ovarian cancer. However, not all carriers develop cancer and high variability exists regarding age of onset of the disease and type of tumor. One of the causes of this variability lies in other genetic factors that modulate the phenotype, the so-called modifier genes. Identification of these genes might have important implications for risk assessment and decision making regarding prevention of the disease. Given that BRCA1 and BRCA2 participate in the repair of DNA double strand breaks, here we have investigated whether variations, Single Nucleotide Polymorphisms (SNPs), in genes participating in other DNA repair pathway may be associated with cancer risk in BRCA carriers. We have selected the Base Excision Repair pathway because BRCA defective cells are extremely sensitive to the inhibition of one of its components, PARP1. Thanks to a large international collaborative effort, we have been able to identify at least two SNPs that are associated with increased cancer risk in BRCA1 and BRCA2 mutation carriers respectively. These findings could have implications not only for risk assessment, but also for treatment of BRCA1/2 mutation carriers with PARP inhibitors.
doi:10.1371/journal.pgen.1004256
PMCID: PMC3974638  PMID: 24698998
2.  CDKL5 gene status in female patients with epilepsy and Rett-like features: two new mutations in the catalytic domain 
BMC Medical Genetics  2012;13:68.
Background
Mutations in the cyclin-dependent kinase-like 5 gene (CDKL5) located in the Xp22 region have been shown to cause a subset of atypical Rett syndrome with infantile spasms or early seizures starting in the first postnatal months.
Methods
We performed mutation screening of CDKL5 in 60 female patients who had been identified as negative for the methyl CpG-binding protein 2 gene (MECP2) mutations, but who had current or past epilepsy, regardless of the age of onset, type, and severity. All the exons in the CDKL5 gene and their neighbouring sequences were examined, and CDKL5 rearrangements were studied by multiplex ligation-dependent probe amplification (MLPA).
Results
Six previously unidentified DNA changes were detected, two of which were disease-causing mutations in the catalytic domain: a frameshift mutation (c.509_510insGT; p.Glu170GlyfsX36) and a complete deletion of exon 10. Both were found in patients with seizures that started in the first month of life.
Conclusions
This study demonstrated the importance of CDKL5 mutations as etiological factors in neurodevelopmental disorders, and indicated that a thorough analysis of the CDKL5 gene sequence and its rearrangements should be considered in females with Rett syndrome-like phenotypes, severe encephalopathy and epilepsy with onset before 5 months of age. This study also confirmed the usefulness of MLPA as a diagnostic screening method for use in clinical practice.
doi:10.1186/1471-2350-13-68
PMCID: PMC3489578  PMID: 22867051
CDKL5; Epilepsy; MECP2; MLPA; Rett syndrome
3.  Breast and ovarian cancer risk evaluation in families with a disease-causing mutation in BRCA1/2 
Journal of community genetics  2010;1(2):91-99.
Germline mutations in BRCA1 and BRCA2 confer high risks of breast and ovarian cancer, and their identification allows genetic testing of at-risk relatives. However, estimates of these risks illustrate controversies, depending on the published series. The penetrance, the earlier onset of the disease and the effect of mutations on the risk of developing breast and ovarian cancer were evaluated in 344 females belonging to 34 families from the Basque Country in Spain, in which BRCA1 or BRCA2 mutations were transmitted. Kaplan–Meier survival curves were used to derive cumulative probability curves for breast and ovarian cancer by mutation status, birth cohort and mutation position, and significance of the differences was assessed using the log-rank test. The estimated probability for breast cancer by age 70 is about 64% in BRCA1 and 69% in BRCA2, whereas the probability of developing ovarian cancer is about 37% and 25% for BRCA1 and BRCA2, respectively. There is a marginally significant higher risk of developing ovarian cancer in BRCA1 families than in BRCA2 families. The effect of birth cohort on breast cancer cumulative incidence presents an increased risk for females born after 1966 and a decreased risk for those born before 1940. There is no association between mutation position and breast cancer; however, ovarian cancer is associated to BRCA1, presenting exon 11 as an ovarian cluster. These results are important for the breast and ovarian cancer diagnosis and prevention in at-risk families.
doi:10.1007/s12687-010-0014-0
PMCID: PMC3185985  PMID: 22460208
Breast cancer; Ovarian cancer; Penetrance; Cumulative risk

Results 1-3 (3)