An original phylogenetic approach identified mitochondrial haplogroup T1a1 as inversely associated with breast cancer risk in BRCA2 mutation carriers.

Authors:
Dr. Sandra Orsulic, Ph.D.
Dr. Sandra Orsulic, Ph.D.
Massachusetts General Hospital
United States
Sophie Blein Claire Bardel Vincent Danjean Lesley McGuffog Sue Healey Daniel Barrowdale Andrew Lee Joe Dennis Karoline B Kuchenbaecker Penny Soucy Mary Beth Terry Wendy K Chung David E Goldgar Saundra S Buys Ramunas Janavicius Laima Tihomirova Nadine Tung Cecilia M Dorfling Elizabeth J van Rensburg Susan L Neuhausen Yuan Chun Ding Anne-Marie Gerdes Bent Ejlertsen Finn C Nielsen Thomas Vo Hansen Ana Osorio Javier Benitez Raquel Andrés Conejero Ena Segota Jeffrey N Weitzel Margo Thelander Paolo Peterlongo Paolo Radice Valeria Pensotti Riccardo Dolcetti Bernardo Bonanni Bernard Peissel Daniela Zaffaroni Giulietta Scuvera Siranoush Manoukian Liliana Varesco Gabriele L Capone Laura Papi Laura Ottini Drakoulis Yannoukakos Irene Konstantopoulou Judy Garber Ute Hamann Alan Donaldson Angela Brady Carole Brewer Claire Foo D Gareth Evans Debra Frost Diana Eccles Fiona Douglas Jackie Cook Julian Adlard Julian Barwell Lisa Walker Louise Izatt Lucy E Side M John Kennedy Marc Tischkowitz Mark T Rogers Mary E Porteous Patrick J Morrison Radka Platte Ros Eeles Rosemarie Davidson Shirley Hodgson Trevor Cole Andrew K Godwin Claudine Isaacs Kathleen Claes Kim De Leeneer Alfons Meindl Andrea Gehrig Barbara Wappenschmidt Christian Sutter Christoph Engel Dieter Niederacher Doris Steinemann Hansjoerg Plendl Karin Kast Kerstin Rhiem Nina Ditsch Norbert Arnold Raymonda Varon-Mateeva Rita K Schmutzler Sabine Preisler-Adams Nadja Bogdanova Markov Shan Wang-Gohrke Antoine de Pauw Cédrick Lefol Christine Lasset Dominique Leroux Etienne Rouleau Francesca Damiola Hélène Dreyfus Laure Barjhoux Lisa Golmard Nancy Uhrhammer Valérie Bonadona Valérie Sornin Yves-Jean Bignon Jonathan Carter Linda Van Le Marion Piedmonte Paul A DiSilvestro Miguel de la Hoya Trinidad Caldes Heli Nevanlinna Kristiina Aittomäki Agnes Jager Ans Mw van den Ouweland Carolien M Kets Cora M Aalfs Flora E van Leeuwen Frans Bl Hogervorst Hanne Ej Meijers-Heijboer Jan C Oosterwijk Kees Ep van Roozendaal Matti A Rookus Peter Devilee Rob B van der Luijt Edith Olah Orland Diez Alex Teulé Conxi Lazaro Ignacio Blanco Jesús Del Valle Anna Jakubowska Grzegorz Sukiennicki Jacek Gronwald Jan Lubinski Katarzyna Durda Katarzyna Jaworska-Bieniek Bjarni A Agnarsson Christine Maugard Alberto Amadori Marco Montagna Manuel R Teixeira Amanda B Spurdle William Foulkes Curtis Olswold Noralane M Lindor Vernon S Pankratz Csilla I Szabo Anne Lincoln Lauren Jacobs Marina Corines Mark Robson Joseph Vijai Andreas Berger Anneliese Fink-Retter Christian F Singer Christine Rappaport Daphne Geschwantler Kaulich Georg Pfeiler Muy-Kheng Tea Mark H Greene Phuong L Mai Gad Rennert Evgeny N Imyanitov Anna Marie Mulligan Gord Glendon Irene L Andrulis Sandrine Tchatchou Amanda Ewart Toland Inge Sokilde Pedersen Mads Thomassen Torben A Kruse Uffe Birk Jensen Maria A Caligo Eitan Friedman Jamal Zidan Yael Laitman Annika Lindblom Beatrice Melin Brita Arver Niklas Loman Richard Rosenquist Olufunmilayo I Olopade Robert L Nussbaum Susan J Ramus Katherine L Nathanson Susan M Domchek Timothy R Rebbeck Banu K Arun Gillian Mitchell Beth Y Karlan Jenny Lester Dominique Stoppa-Lyonnet Gilles Thomas Jacques Simard Fergus J Couch Kenneth Offit Douglas F Easton Georgia Chenevix-Trench Antonis C Antoniou Sylvie Mazoyer Catherine M Phelan Olga M Sinilnikova David G Cox

Breast Cancer Res 2015 Apr 25;17:61. Epub 2015 Apr 25.

INSERM U1052, CNRS UMR5286, Université Lyon 1, Centre de Recherche en Cancérologie de Lyon, Lyon, France.

Introduction: Individuals carrying pathogenic mutations in the BRCA1 and BRCA2 genes have a high lifetime risk of breast cancer. BRCA1 and BRCA2 are involved in DNA double-strand break repair, DNA alterations that can be caused by exposure to reactive oxygen species, a main source of which are mitochondria. Mitochondrial genome variations affect electron transport chain efficiency and reactive oxygen species production. Individuals with different mitochondrial haplogroups differ in their metabolism and sensitivity to oxidative stress. Variability in mitochondrial genetic background can alter reactive oxygen species production, leading to cancer risk. In the present study, we tested the hypothesis that mitochondrial haplogroups modify breast cancer risk in BRCA1/2 mutation carriers.

Methods: We genotyped 22,214 (11,421 affected, 10,793 unaffected) mutation carriers belonging to the Consortium of Investigators of Modifiers of BRCA1/2 for 129 mitochondrial polymorphisms using the iCOGS array. Haplogroup inference and association detection were performed using a phylogenetic approach. ALTree was applied to explore the reference mitochondrial evolutionary tree and detect subclades enriched in affected or unaffected individuals.

Results: We discovered that subclade T1a1 was depleted in affected BRCA2 mutation carriers compared with the rest of clade T (hazard ratio (HR) = 0.55; 95% confidence interval (CI), 0.34 to 0.88; P = 0.01). Compared with the most frequent haplogroup in the general population (that is, H and T clades), the T1a1 haplogroup has a HR of 0.62 (95% CI, 0.40 to 0.95; P = 0.03). We also identified three potential susceptibility loci, including G13708A/rs28359178, which has demonstrated an inverse association with familial breast cancer risk.

Conclusions: This study illustrates how original approaches such as the phylogeny-based method we used can empower classical molecular epidemiological studies aimed at identifying association or risk modification effects.

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http://dx.doi.org/10.1186/s13058-015-0567-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4478717PMC

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April 2015
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