TY - JOUR T1 - Trans-ethnic Evaluation Identifies Novel Low Frequency Loci Associated with 25-Hydroxyvitamin D Concentrations. JF - J Clin Endocrinol Metab Y1 - 2018 A1 - Hong, Jaeyoung A1 - Hatchell, Kathryn E A1 - Bradfield, Jonathan P A1 - Andrew, Bjonnes A1 - Alessandra, Chesi A1 - Chao-Qiang, Lai A1 - Langefeld, Carl D A1 - Lu, Lingyi A1 - Lu, Yingchang A1 - Lutsey, Pamela L A1 - Musani, Solomon K A1 - Nalls, Mike A A1 - Robinson-Cohen, Cassianne A1 - Roizen, Jeffery D A1 - Saxena, Richa A1 - Tucker, Katherine L A1 - Ziegler, Julie T A1 - Arking, Dan E A1 - Bis, Joshua C A1 - Boerwinkle, Eric A1 - Bottinger, Erwin P A1 - Bowden, Donald W A1 - Gilsanz, Vincente A1 - Houston, Denise K A1 - Kalkwarf, Heidi J A1 - Kelly, Andrea A1 - Lappe, Joan M A1 - Liu, Yongmei A1 - Michos, Erin D A1 - Oberfield, Sharon E A1 - Palmer, Nicholette D A1 - Rotter, Jerome I A1 - Sapkota, Bishwa A1 - Shepherd, John A A1 - Wilson, James G A1 - Basu, Saonli A1 - de Boer, Ian H A1 - Divers, Jasmin A1 - Freedman, Barry I A1 - Grant, Struan F A A1 - Hakanarson, Hakon A1 - Harris, Tamara B A1 - Kestenbaum, Bryan R A1 - Kritchevsky, Stephen B A1 - Loos, Ruth J F A1 - Norris, Jill M A1 - Norwood, Arnita F A1 - Ordovas, Jose M A1 - Pankow, James S A1 - Psaty, Bruce M A1 - Sanhgera, Dharambir K A1 - Wagenknecht, Lynne E A1 - Zemel, Babette S A1 - Meigs, James A1 - Dupuis, Josée A1 - Florez, Jose C A1 - Wang, Thomas A1 - Liu, Ching-Ti A1 - Engelman, Corinne D A1 - Billings, Liana K AB -

Context: Vitamin D inadequacy is common in the adult population of the United States. While the genetic determinants underlying vitamin D inadequacy have been studied in people of European ancestry, less is known in Hispanic or African ancestry populations.

Objective: The TRANSCEN-D (TRANS-ethniC Evaluation of vitamiN D GWAS) consortium was assembled to replicate genetic associations with 25-hydroxyvitamin D (25(OH)D) concentrations from the meta-analyses of European ancestry (SUNLIGHT) and to identify novel genetic variants related to vitamin D concentrations in African and Hispanic ancestries.

Design: Ancestry-specific (Hispanic and African) and trans-ethnic (Hispanic, African and European) meta-analyses were performed using the METAL software.

Patients or Other Participants: In total, 8,541 African-American and 3,485 Hispanic-American (from North America) participants from twelve cohorts, and 16,124 European participants from SUNLIGHT were included in the study.

Main Outcome Measure(s): Blood concentrations of 25(OH)D were measured for all participants.

Results: Ancestry-specific analyses in African and Hispanic Americans replicated SNPs in GC (2 and 4 SNPs, respectively). A potentially novel SNP (rs79666294) near the KIF4B gene was identified in the African-American cohort. Trans-ethnic evaluation replicated GC and DHCR7 region SNPs. Additionally, the trans-ethnic analyses revealed novel SNPs rs719700 and rs1410656 near the ANO6/ARID2 and HTR2A genes, respectively.

Conclusions: Ancestry-specific and trans-ethnic GWAS of 25(OH)D confirmed findings in GC and DHCR7 for African and Hispanic American samples and revealed novel findings near KIF4B, ANO6/ARID2, and HTR2A. The biological mechanisms that link these regions with 25(OH)D metabolism require further investigation.

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