Exome sequence identifies RIPK4 as the Bartsocas-Papas syndrome locus

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Karen Mitchell1, James O'Sullivan, Caterina Missero

  • 1Faculty of Medical and Human Sciences, Manchester Academic Health Sciences Centre, University of Manchester, UK.

American Journal of Human Genetics
|December 27, 2011
PubMed

Insights

Pterygium syndromes, rare genetic disorders causing skin webs, were linked to mutations in the RIPK4 gene. This research identifies RIPK4 as a key player in stratified epithelial development, crucial for preventing these conditions.

Area of Science:

  • Genetics
  • Developmental Biology
  • Molecular Biology

Background:

  • Pterygium syndromes are a group of complex congenital disorders characterized by skin webbing and craniofacial anomalies.
  • Severe forms, like Bartsocas-Papas syndrome, often lead to early lethality, hindering genetic mutation identification.

Observation:

  • Exome sequencing in a consanguineous family revealed a homozygous mutation (c.1127C>A) in the RIPK4 gene, leading to a nonsense mutation (p.Ser376X).
  • A second mutation (c.242T>A) in RIPK4, causing a missense variant (p.Ile81Asn), was also identified in the kinase domain.

Findings:

  • The identified RIPK4 mutations disrupt the ankyrin repeat-containing kinase, essential for keratinocyte differentiation.
  • RIPK4 was demonstrated to be a direct transcriptional target of the p63 protein.
  • p63 acts as a master regulator in stratified epithelial development, with RIPK4 being a nodal point in preventing pterygium syndromes.

Implications:

  • This study elucidates the genetic basis of certain pterygium syndromes by identifying RIPK4 mutations.
  • Understanding the RIPK4-p63 pathway provides crucial insights into stratified epithelial development.
  • These findings pave the way for potential diagnostic and therapeutic strategies for pterygium syndromes.

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