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Pleiotropy method reveals genetic overlap between orofacial clefts at multiple novel loci from GWAS of multi-ethnic trios

Author

Listed:
  • Debashree Ray
  • Sowmya Venkataraghavan
  • Wanying Zhang
  • Elizabeth J Leslie
  • Jacqueline B Hetmanski
  • Seth M Weinberg
  • Jeffrey C Murray
  • Mary L Marazita
  • Ingo Ruczinski
  • Margaret A Taub
  • Terri H Beaty

Abstract

Based on epidemiologic and embryologic patterns, nonsyndromic orofacial clefts– the most common craniofacial birth defects in humans– are commonly categorized into cleft lip with or without cleft palate (CL/P) and cleft palate alone (CP), which are traditionally considered to be etiologically distinct. However, some evidence of shared genetic risk in IRF6, GRHL3 and ARHGAP29 regions exists; only FOXE1 has been recognized as significantly associated with both CL/P and CP in genome-wide association studies (GWAS). We used a new statistical approach, PLACO (pleiotropic analysis under composite null), on a combined multi-ethnic GWAS of 2,771 CL/P and 611 CP case-parent trios. At the genome-wide significance threshold of 5 × 10−8, PLACO identified 1 locus in 1q32.2 (IRF6) that appears to increase risk for one OFC subgroup but decrease risk for the other. At a suggestive significance threshold of 10−6, we found 5 more loci with compelling candidate genes having opposite effects on CL/P and CP: 1p36.13 (PAX7), 3q29 (DLG1), 4p13 (LIMCH1), 4q21.1 (SHROOM3) and 17q22 (NOG). Additionally, we replicated the recognized shared locus 9q22.33 (FOXE1), and identified 2 loci in 19p13.12 (RAB8A) and 20q12 (MAFB) that appear to influence risk of both CL/P and CP in the same direction. We found locus-specific effects may vary by racial/ethnic group at these regions of genetic overlap, and failed to find evidence of sex-specific differences. We confirmed shared etiology of the two OFC subtypes comprising CL/P, and additionally found suggestive evidence of differences in their pathogenesis at 2 loci of genetic overlap. Our novel findings include 6 new loci of genetic overlap between CL/P and CP; 3 new loci between pairwise OFC subtypes; and 4 loci not previously implicated in OFCs. Our in-silico validation showed PLACO is robust to subtype-specific effects, and can achieve massive power gains over existing approaches for identifying genetic overlap between disease subtypes. In summary, we found suggestive evidence for new genetic regions and confirmed some recognized OFC genes either exerting shared risk or with opposite effects on risk to OFC subtypes.Author summary: Based on epidemiologic and embryologic patterns, nonsyndromic orofacial clefts are commonly categorized into cleft lip with or without cleft palate (CL/P) and cleft palate alone (CP). While nearly forty risk genes have been identified for CL/P, few risk genes are known for CP. We used a new statistical method, PLACO, to identify genetic variants influencing risk of both CL/P and CP either in the same direction or in opposite directions. In a combined multi-ethnic genome-wide study of 2,771 CL/P and 611 CP case-parent trios, we discovered 6 new loci of genetic overlap between CL/P and CP; 3 new loci between pairwise OFC subtypes; and 4 loci not previously implicated in OFCs. Of these loci, 2 were identified at the genome-wide threshold, and the rest at a suggestive significance threshold of 10−6. Locus-specific effects appear to vary by racial/ethnic group at these regions of genetic overlap. We replicated the shared genetic etiology of subtypes underlying CL/P, and further discovered loci of genetic overlap exhibiting etiologic differences. In summary, we found suggestive evidence for new genetic regions and confirmed some recognized OFC genes either exerting shared risk or with opposite effects on risk to OFC subtypes.

Suggested Citation

  • Debashree Ray & Sowmya Venkataraghavan & Wanying Zhang & Elizabeth J Leslie & Jacqueline B Hetmanski & Seth M Weinberg & Jeffrey C Murray & Mary L Marazita & Ingo Ruczinski & Margaret A Taub & Terri H, 2021. "Pleiotropy method reveals genetic overlap between orofacial clefts at multiple novel loci from GWAS of multi-ethnic trios," PLOS Genetics, Public Library of Science, vol. 17(7), pages 1-28, July.
  • Handle: RePEc:plo:pgen00:1009584
    DOI: 10.1371/journal.pgen.1009584
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    2. Huan Liu & Elizabeth J. Leslie & Jenna C. Carlson & Terri H. Beaty & Mary L. Marazita & Andrew C. Lidral & Robert A. Cornell, 2017. "Identification of common non-coding variants at 1p22 that are functional for non-syndromic orofacial clefting," Nature Communications, Nature, vol. 8(1), pages 1-13, April.
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