Common Genetic Variation in Circadian Rhythm Genes and Risk of Epithelial Ovarian Cancer (EOC)

• Published in: Journal of genetics and genome research Vol. 2; no. 2
• Main Authors: Jim, Heather S L, Lin, Hui-Yi, Tyrer, Jonathan P, Lawrenson, Kate, Dennis, Joe, Chornokur, Ganna, Chen, Zhihua, Chen, Ann Y, Permuth-Wey, Jennifer, Aben, Katja Kh, Anton-Culver, Hoda, Antonenkova, Natalia, Bruinsma, Fiona, Bandera, Elisa V, Bean, Yukie T, Beckmann, Matthias W, Bisogna, Maria, Bjorge, Line, Bogdanova, Natalia, Brinton, Louise A, Brooks-Wilson, Angela, Bunker, Clareann H, Butzow, Ralf, Campbell, Ian G, Carty, Karen, Chang-Claude, Jenny, Cook, Linda S, Cramer, Daniel W, Cunningham, Julie M, Cybulski, Cezary, Dansonka-Mieszkowska, Agnieszka, du Bois, Andreas, Despierre, Evelyn, Sieh, Weiva, Doherty, Jennifer A, Dörk, Thilo, Dürst, Matthias, Easton, Douglas F, Eccles, Diana M, Edwards, Robert P, Ekici, Arif B, Fasching, Peter A, Fridley, Brooke L, Gao, Yu-Tang, Gentry-Maharaj, Aleksandra, Giles, Graham G, Glasspool, Rosalind, Goodman, Marc T, Gronwald, Jacek, Harter, Philipp, Hasmad, Hanis N, Hein, Alexander, Heitz, Florian, Hildebrandt, Michelle A T, Hillemanns, Peter, Hogdall, Claus K, Hogdall, Estrid, Hosono, Satoyo, Iversen, Edwin S, Jakubowska, Anna, Jensen, Allan, Ji, Bu-Tian, Karlan, Beth Y, Kellar, Melissa, Kiemeney, Lambertus A, Krakstad, Camilla, Kjaer, Susanne K, Kupryjanczyk, Jolanta, Vierkant, Robert A, Lambrechts, Diether, Lambrechts, Sandrina, Le, Nhu D, Lee, Alice W, Lele, Shashi, Leminen, Arto, Lester, Jenny, Levine, Douglas A, Liang, Dong, Lim, Boon Kiong, Lissowska, Jolanta, Lu, Karen, Lubinski, Jan, Lundvall, Lene, Massuger, Leon F A G, Matsuo, Keitaro, McGuire, Valerie, McLaughlin, John R, McNeish, Ian, Menon, Usha, Milne, Roger L, Modugno, Francesmary, Thomsen, Lotte, Moysich, Kirsten B, Ness, Roberta B, Nevanlinna, Heli, Eilber, Ursula, Odunsi, Kunle, Olson, Sara H, Orlow, Irene, Orsulic, Sandra
• Format: Journal Article
• Language: English
• Published: United States 2015
• ISSN: 2378-3648

Disruption in circadian gene expression, whether due to genetic variation or environmental factors (e.g., light at night, shiftwork), is associated with increased incidence of breast, prostate, gastrointestinal and hematologic cancers and gliomas. Circadian genes are highly expressed in the ovaries where they regulate ovulation; circadian disruption is associated with several ovarian cancer risk factors (e.g., endometriosis). However, no studies have examined variation in germline circadian genes as predictors of ovarian cancer risk and invasiveness. The goal of the current study was to examine single nucleotide polymorphisms (SNPs) in circadian genes and and downstream transcription factors and as predictors of risk of epithelial ovarian cancer (EOC) and histopathologic subtypes. The study included a test set of 3,761 EOC cases and 2,722 controls and a validation set of 44,308 samples including 18,174 (10,316 serous) cases and 26,134 controls from 43 studies participating in the Ovarian Cancer Association Consortium (OCAC). Analysis of genotype data from 36 genotyped SNPs and 4600 imputed SNPs indicated that the most significant association was rs117104877 in (OR = 0.79, 95% CI = 0.68-0.90, p = 5.59 × 10 ]. Functional analysis revealed a significant down regulation of expression following overexpression and increasing transformation in ovarian surface epithelial (OSE) cells as well as alternative splicing of exons in ovarian and granulosa cells. These results suggest that variation in circadian genes, and specifically , may be associated with risk of ovarian cancer, likely through disruption of hormonal pathways.