Mutations in HYAL2, Encoding Hyaluronidase 2, Cause a Syndrome of Orofacial Clefting and Cor Triatriatum Sinister in Humans and Mice

Martina M A Muggenthaler, Biswajit Chowdhury, S. Naimul Hasan, Harold E Cross, Brian Mark, Gaurav V. Harlalka, Michael A. Patton, Miho Ishida, Elijah R. Behr, Sanjay Sharma, Kenneth Zahka, Eissa Faqeih, Brian Blakley, Mike Jackson, Melissa Lees, Vernon Dolinsky, Leroy Cross, Philip Stanier, Claire Salter, Emma L. BapleFowzan S. Alkuraya, Andrew H. Crosby, Barbara Triggs-Raine, Barry A. Chioza

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5 Scopus citations

Abstract

Orofacial clefting is amongst the most common of birth defects, with both genetic and environmental components. Although numerous studies have been undertaken to investigate the complexities of the genetic etiology of this heterogeneous condition, this factor remains incompletely understood. Here, we describe mutations in the HYAL2 gene as a cause of syndromic orofacial clefting. HYAL2, encoding hyaluronidase 2, degrades extracellular hyaluronan, a critical component of the developing heart and palatal shelf matrix. Transfection assays demonstrated that the gene mutations destabilize the molecule, dramatically reducing HYAL2 protein levels. Consistent with the clinical presentation in affected individuals, investigations of Hyal2-/-mice revealed craniofacial abnormalities, including submucosal cleft palate. In addition, cor triatriatum sinister and hearing loss, identified in a proportion of Hyal2-/-mice, were also found as incompletely penetrant features in affected humans. Taken together our findings identify a new genetic cause of orofacial clefting in humans and mice, and define the first molecular cause of human cor triatriatum sinister, illustrating the fundamental importance of HYAL2 and hyaluronan turnover for normal human and mouse development.

Original languageEnglish (US)
Article numbere1006470
JournalPLoS Genetics
Volume13
Issue number1
DOIs
StatePublished - Jan 1 2017

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ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics
  • Genetics(clinical)
  • Cancer Research

Cite this

Muggenthaler, M. M. A., Chowdhury, B., Hasan, S. N., Cross, H. E., Mark, B., Harlalka, G. V., Patton, M. A., Ishida, M., Behr, E. R., Sharma, S., Zahka, K., Faqeih, E., Blakley, B., Jackson, M., Lees, M., Dolinsky, V., Cross, L., Stanier, P., Salter, C., ... Chioza, B. A. (2017). Mutations in HYAL2, Encoding Hyaluronidase 2, Cause a Syndrome of Orofacial Clefting and Cor Triatriatum Sinister in Humans and Mice. PLoS Genetics, 13(1), [e1006470]. https://doi.org/10.1371/journal.pgen.1006470