Association of breast cancer risk in BRCA1 and BRCA2 mutation carriers with genetic variants showing differential allelic expression: identification of a modifier of breast cancer risk at locus 11q22.3.

Authors:
Yosr Hamdi Penny Soucy Karoline B Kuchenbaeker Tomi Pastinen Arnaud Droit Audrey Lemaçon Julian Adlard Kristiina Aittomäki Irene L Andrulis Adalgeir Arason Norbert Arnold Banu K Arun Jacopo Azzollini Anita Bane Laure Barjhoux Daniel Barrowdale Javier Benitez Pascaline Berthet Marinus J Blok Kristie Bobolis Valérie Bonadona Bernardo Bonanni Angela R Bradbury Carole Brewer Bruno Buecher Saundra S Buys Maria A Caligo Jocelyne Chiquette Wendy K Chung Kathleen B M Claes Mary B Daly Francesca Damiola Rosemarie Davidson Miguel De la Hoya Kim De Leeneer Orland Diez Yuan Chun Ding Riccardo Dolcetti Susan M Domchek Cecilia M Dorfling Diana Eccles Ros Eeles Zakaria Einbeigi Bent Ejlertsen Christoph Engel D Gareth Evans Lidia Feliubadalo Lenka Foretova Florentia Fostira William D Foulkes George Fountzilas Eitan Friedman Debra Frost Pamela Ganschow Patricia A Ganz Judy Garber Simon A Gayther Anne-Marie Gerdes Gord Glendon Andrew K Godwin David E Goldgar Mark H Greene Jacek Gronwald Eric Hahnen Ute Hamann Thomas V O Hansen Steven Hart John L Hays Frans B L Hogervorst Peter J Hulick Evgeny N Imyanitov Claudine Isaacs Louise Izatt Anna Jakubowska Paul James Ramunas Janavicius Uffe Birk Jensen Esther M John Vijai Joseph Walter Just Katarzyna Kaczmarek Beth Y Karlan Carolien M Kets Judy Kirk Mieke Kriege Yael Laitman Maïté Laurent Conxi Lazaro Goska Leslie Jenny Lester Fabienne Lesueur Annelie Liljegren Niklas Loman Jennifer T Loud Siranoush Manoukian Milena Mariani Sylvie Mazoyer Lesley McGuffog Hanne E J Meijers-Heijboer Alfons Meindl Austin Miller Marco Montagna Anna Marie Mulligan Katherine L Nathanson Susan L Neuhausen Heli Nevanlinna Robert L Nussbaum Edith Olah Olufunmilayo I Olopade Kai-Ren Ong Jan C Oosterwijk Ana Osorio Laura Papi Sue Kyung Park Inge Sokilde Pedersen Bernard Peissel Pedro Perez Segura Paolo Peterlongo Catherine M Phelan Paolo Radice Johanna Rantala Christine Rappaport-Fuerhauser Gad Rennert Andrea Richardson Mark Robson Gustavo C Rodriguez Matti A Rookus Rita Katharina Schmutzler Nicolas Sevenet Payal D Shah Christian F Singer Thomas P Slavin Katie Snape Johanna Sokolowska Ida Marie Heeholm Sønderstrup Melissa Southey Amanda B Spurdle Zsofia Stadler Dominique Stoppa-Lyonnet Grzegorz Sukiennicki Christian Sutter Yen Tan Muy-Kheng Tea Manuel R Teixeira Alex Teulé Soo-Hwang Teo Mary Beth Terry Mads Thomassen Laima Tihomirova Marc Tischkowitz Silvia Tognazzo Amanda Ewart Toland Nadine Tung Ans M W van den Ouweland Rob B van der Luijt Klaartje van Engelen Elizabeth J van Rensburg Raymonda Varon-Mateeva Barbara Wappenschmidt Juul T Wijnen Timothy Rebbeck Georgia Chenevix-Trench Kenneth Offit Fergus J Couch Silje Nord Douglas F Easton Antonis C Antoniou Jacques Simard

Breast Cancer Res Treat 2017 01 28;161(1):117-134. Epub 2016 Oct 28.

Genomics Center, Centre Hospitalier Universitaire de Québec Research Center and Laval University, 2705 Laurier Boulevard, Quebec, QC, G1V 4G2, Canada.

Purpose: Cis-acting regulatory SNPs resulting in differential allelic expression (DAE) may, in part, explain the underlying phenotypic variation associated with many complex diseases. To investigate whether common variants associated with DAE were involved in breast cancer susceptibility among BRCA1 and BRCA2 mutation carriers, a list of 175 genes was developed based of their involvement in cancer-related pathways.

Methods: Using data from a genome-wide map of SNPs associated with allelic expression, we assessed the association of ~320 SNPs located in the vicinity of these genes with breast and ovarian cancer risks in 15,252 BRCA1 and 8211 BRCA2 mutation carriers ascertained from 54 studies participating in the Consortium of Investigators of Modifiers of BRCA1/2.

Results: We identified a region on 11q22.3 that is significantly associated with breast cancer risk in BRCA1 mutation carriers (most significant SNP rs228595 p = 7 × 10). This association was absent in BRCA2 carriers (p = 0.57). The 11q22.3 region notably encompasses genes such as ACAT1, NPAT, and ATM. Expression quantitative trait loci associations were observed in both normal breast and tumors across this region, namely for ACAT1, ATM, and other genes. In silico analysis revealed some overlap between top risk-associated SNPs and relevant biological features in mammary cell data, which suggests potential functional significance.

Conclusion: We identified 11q22.3 as a new modifier locus in BRCA1 carriers. Replication in larger studies using estrogen receptor (ER)-negative or triple-negative (i.e., ER-, progesterone receptor-, and HER2-negative) cases could therefore be helpful to confirm the association of this locus with breast cancer risk.

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http://dx.doi.org/10.1007/s10549-016-4018-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5222911PMC
January 2017
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