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GWAS reveals loci associated with velopharyngeal dysfunction.

Jonathan Chernus1, Jasmien Roosenboom2, Matthew Ford3

  • 1Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, 15261, USA.

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Velopharyngeal dysfunction (VPD) may be a subclinical sign of orofacial clefting. This genetic study identified five key genetic loci associated with VPD in unaffected relatives of cleft palate patients.

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Area of Science:

  • Genetics
  • Craniofacial biology
  • Speech pathology

Background:

  • Velopharyngeal dysfunction (VPD) causes hypernasality and speech issues due to incomplete separation of oral and nasal cavities.
  • VPD is often linked to cleft palate and may represent a subclinical phenotype within families affected by orofacial clefting.

Purpose of the Study:

  • To investigate the genetic basis of VPD as a potential subclinical manifestation of orofacial clefting.
  • To identify genetic loci associated with VPD in unaffected relatives of individuals with cleft palate.

Main Methods:

  • Genome-wide association study (GWAS) conducted on 976 unaffected relatives of isolated cleft palate probands.
  • Analysis included 54 relatives diagnosed with velopharyngeal dysfunction.

Main Results:

  • Five genetic loci (3q29, 9p21.1, 12q21.31, 16p12.3, 16p13.3) showed significant association with VPD (p < 5 × 10⁻⁸).
  • An additional 15 loci demonstrated suggestive evidence of association.
  • Several known orofacial clefting and craniofacial development genes (e.g., TFRC, PCYT1A, BNC2, FREM1) are located within these associated regions.

Conclusions:

  • Findings suggest a potential shared genetic architecture between VPD and cleft palate.
  • The results support the hypothesis that VPD may function as a subclinical phenotype of orofacial clefting, indicating a shared etiological basis.