HOXB1 founder mutation in humans recapitulates the phenotype of Hoxb1 -/- mice

Bryn D. Webb, Sherin Shaaban, Harald Gaspar, Luis F. Cunha, Christian R. Schubert, Ke Hao, Caroline D. Robson, Wai Man Chan, Caroline Andrews, Sarah MacKinnon, Darren T. Oystreck, David G. Hunter, Anthony J. Iacovelli, Xiaoqian Ye, Anne Camminady, Elizabeth C. Engle, Ethylin Wang Jabs

Research output: Contribution to journalArticlepeer-review

Abstract

Members of the highly conserved homeobox (HOX) gene family encode transcription factors that confer cellular and tissue identities along the antero-posterior axis of mice and humans. We have identified a founder homozygous missense mutation in HOXB1 in two families from a conservative German American population. The resulting phenotype includes bilateral facial palsy, hearing loss, and strabismus and correlates extensively with the previously reported Hoxb1-/- mouse phenotype. The missense variant is predicted to result in the substitution of a cysteine for an arginine at amino acid residue 207 (Arg207Cys), which corresponds to the highly conserved Arg5 of the homeodomain. Arg5 interacts with thymine in the minor groove of DNA through hydrogen bonding and electrostatic attraction. Molecular modeling and an in vitro DNA-protein binding assay predict that the mutation would disrupt these interactions, destabilize the HOXB1:PBX1:DNA complex, and alter HOXB1 transcriptional activity.

Original languageEnglish (US)
Pages (from-to)171-179
Number of pages9
JournalAmerican Journal of Human Genetics
Volume91
Issue number1
DOIs
StatePublished - Jul 13 2012

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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