Fine-scale mapping of the 5q11.2 breast cancer locus reveals at least three independent risk variants regulating MAP3K1

Dylan M Glubb, Mel J Maranian, Kyriaki Michailidou, Karen A Pooley, Kerstin B Meyer, Siddhartha Kar, Saskia Carlebur, Martin O'Reilly, Joshua A Betts, Kristine M Hillman, Susanne Kaufmann, Jonathan Beesley, Sander Canisius, John L Hopper, Melissa C Southey, Helen Tsimiklis, Carmel Apicella, Marjanka K Schmidt, Annegien Broeks, Frans B HogervorstC Ellen van der Schoot, Kenneth Muir, Artitaya Lophatananon, Sarah Stewart-Brown, Pornthep Siriwanarangsan, Peter A Fasching, Matthias Ruebner, Arif B Ekici, Matthias W Beckmann, Julian Peto, Isabel dos-Santos-Silva, Olivia Fletcher, Nichola Johnson, Paul D P Pharoah, Manjeet K Bolla, Qin Wang, Joe Dennis, Elinor J Sawyer, Ian Tomlinson, Michael J Kerin, Nicola Miller, Barbara Burwinkel, Frederik Marme, Rongxi Yang, Harald Surowy, Pascal Guénel, Thérèse Truong, Stig E Bojesen, Børge G Nordestgaard, Sune Fallgaard Nielsen, GENICA Network

50 Citationer (Scopus)

Abstract

Genome-wide association studies (GWASs) have revealed SNP rs889312 on 5q11.2 to be associated with breast cancer risk in women of European ancestry. In an attempt to identify the biologically relevant variants, we analyzed 909 genetic variants across 5q11.2 in 103,991 breast cancer individuals and control individuals from 52 studies in the Breast Cancer Association Consortium. Multiple logistic regression analyses identified three independent risk signals: the strongest associations were with 15 correlated variants (iCHAV1), where the minor allele of the best candidate, rs62355902, associated with significantly increased risks of both estrogen-receptor-positive (ER(+): odds ratio [OR] = 1.24, 95% confidence interval [CI] = 1.21-1.27, ptrend = 5.7 × 10(-44)) and estrogen-receptor-negative (ER(-): OR = 1.10, 95% CI = 1.05-1.15, ptrend = 3.0 × 10(-4)) tumors. After adjustment for rs62355902, we found evidence of association of a further 173 variants (iCHAV2) containing three subsets with a range of effects (the strongest was rs113317823 [pcond = 1.61 × 10(-5)]) and five variants composing iCHAV3 (lead rs11949391; ER(+): OR = 0.90, 95% CI = 0.87-0.93, pcond = 1.4 × 10(-4)). Twenty-six percent of the prioritized candidate variants coincided with four putative regulatory elements that interact with the MAP3K1 promoter through chromatin looping and affect MAP3K1 promoter activity. Functional analysis indicated that the cancer risk alleles of four candidates (rs74345699 and rs62355900 [iCHAV1], rs16886397 [iCHAV2a], and rs17432750 [iCHAV3]) increased MAP3K1 transcriptional activity. Chromatin immunoprecipitation analysis revealed diminished GATA3 binding to the minor (cancer-protective) allele of rs17432750, indicating a mechanism for its action. We propose that the cancer risk alleles act to increase MAP3K1 expression in vivo and might promote breast cancer cell survival.

OriginalsprogEngelsk
TidsskriftAmerican Journal of Human Genetics
Vol/bind96
Udgave nummer1
Sider (fra-til)5-20
Antal sider16
ISSN0002-9297
DOI
StatusUdgivet - 8 jan. 2015

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