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Ishorst N, Francheschelli P, Böhmer AC, Khan MFJ, Heilmann-Heimbach S, Fricker N, Little J, Steegers-Theunissen RPM, Peterlin B, Nowak S, Martini M, Kruse T, Dunsche A, Kreusch T, Gölz L, Aldhorae K, Halboub E, Reutter H, Mossey P, Nöthen MM, Rubini M, Ludwig KU, Knapp M, Mangold E. Nonsyndromic cleft palate: An association study at GWAS candidate loci in a multiethnic sample. Birth Defects Res 2018; 110:871-882. [PMID: 29498243 DOI: 10.1002/bdr2.1213] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 01/19/2018] [Accepted: 02/07/2018] [Indexed: 12/20/2022]
Abstract
BACKGROUND Nonsyndromic cleft palate only (nsCPO) is a common and multifactorial form of orofacial clefting. In contrast to successes achieved for the other common form of orofacial clefting, that is, nonsyndromic cleft lip with/without cleft palate (nsCL/P), genome wide association studies (GWAS) of nsCPO have identified only one genome wide significant locus. Aim of the present study was to investigate whether common variants contribute to nsCPO and, if so, to identify novel risk loci. METHODS We genotyped 33 SNPs at 27 candidate loci from 2 previously published nsCPO GWAS in an independent multiethnic sample. It included: (i) a family-based sample of European ancestry (n = 212); and (ii) two case/control samples of Central European (n = 94/339) and Arabian ancestry (n = 38/231), respectively. A separate association analysis was performed for each genotyped dataset, and meta-analyses were performed. RESULTS After association analysis and meta-analyses, none of the 33 SNPs showed genome-wide significance. Two variants showed nominally significant association in the imputed GWAS dataset and exhibited a further decrease in p-value in a European and an overall meta-analysis including imputed GWAS data, respectively (rs395572: PMetaEU = 3.16 × 10-4 ; rs6809420: PMetaAll = 2.80 × 10-4 ). CONCLUSION Our findings suggest that there is a limited contribution of common variants to nsCPO. However, the individual effect sizes might be too small for detection of further associations in the present sample sizes. Rare variants may play a more substantial role in nsCPO than in nsCL/P, for which GWAS of smaller sample sizes have identified genome-wide significant loci. Whole-exome/genome sequencing studies of nsCPO are now warranted.
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Affiliation(s)
- Nina Ishorst
- Department of Genomics, Life & Brain Center, University of Bonn, Bonn, Germany.,Institute of Human Genetics, University of Bonn, Bonn, Germany
| | - Paola Francheschelli
- Department of Biomedical and Specialty Surgical Sciences, Section of Medical Biochemistry, Molecular Biology and Genetics, University of Ferrara, Ferrara, Italy
| | - Anne C Böhmer
- Department of Genomics, Life & Brain Center, University of Bonn, Bonn, Germany.,Institute of Human Genetics, University of Bonn, Bonn, Germany
| | - Mohammad Faisal J Khan
- Department of Biomedical and Specialty Surgical Sciences, Section of Medical Biochemistry, Molecular Biology and Genetics, University of Ferrara, Ferrara, Italy
| | - Stefanie Heilmann-Heimbach
- Department of Genomics, Life & Brain Center, University of Bonn, Bonn, Germany.,Institute of Human Genetics, University of Bonn, Bonn, Germany
| | - Nadine Fricker
- Department of Genomics, Life & Brain Center, University of Bonn, Bonn, Germany.,Institute of Human Genetics, University of Bonn, Bonn, Germany
| | - Julian Little
- School of Epidemiology, Public Health and Preventive Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | - Regine P M Steegers-Theunissen
- Department of Obstetrics and Gynaecology, Department of Pediatrics, Division Neonatology Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Borut Peterlin
- Department of Obstetrics & Gynecology, Clinical Institute of Medical Genetics, University Medical Center Ljubljana, Ljubljana, Slovenia
| | - Stefanie Nowak
- Institute of Human Genetics, University of Bonn, Bonn, Germany
| | - Markus Martini
- Department of Oral and Maxillo-Facial-Plastic Surgery, University of Bonn, Bonn, Germany
| | - Teresa Kruse
- Department of Orthodontics, University of Cologne, Cologne, Germany
| | - Anton Dunsche
- Department of Oral and Maxillo-Facial Surgery, Clinics Karlsruhe, Karlsruhe, Germany
| | - Thomas Kreusch
- Department of Oral and Maxillofacial Surgery, Head and Neck Centre, Asklepios Klinik Nord-Heidberg, Hamburg, Germany
| | - Lina Gölz
- Department of Orthodontics, University of Bonn, Bonn, Germany
| | - Khalid Aldhorae
- Orthodontic Department, College of Dentistry, Thamar University, Thamar, Yemen
| | - Esam Halboub
- Department of Maxillofacial Surgery and Diagnostic Sciences, Devision of Oral Medicine and Diagnostic Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia
| | - Heiko Reutter
- Institute of Human Genetics, University of Bonn, Bonn, Germany.,Department of Neonatology, Children's Hospital, University of Bonn, Bonn, Germany
| | - Peter Mossey
- Dental Hospital, University of Dundee, Dundee, United Kingdom
| | - Markus M Nöthen
- Department of Genomics, Life & Brain Center, University of Bonn, Bonn, Germany.,Institute of Human Genetics, University of Bonn, Bonn, Germany
| | - Michele Rubini
- Department of Biomedical and Specialty Surgical Sciences, Section of Medical Biochemistry, Molecular Biology and Genetics, University of Ferrara, Ferrara, Italy
| | - Kerstin U Ludwig
- Department of Genomics, Life & Brain Center, University of Bonn, Bonn, Germany.,Institute of Human Genetics, University of Bonn, Bonn, Germany
| | - Michael Knapp
- Institute of Medical Biometry, Informatics and Epidemiology, University of Bonn, Bonn, Germany
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