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Variable phenotypic manifestations of a K44N mutation in the TGIF gene
Antonio Richieri-Costa1, Lucilene Arilho Ribeiro
1Departamento de Genética, Hospital de Reabilitação de Anomalias Craniofaciais, Universidade de São Paulo, Rua Silvio Marchioni 320, CEP 17012-900, Bauru, SP, Brazil. richieri@usp.br
Abstract:
The etiologies and clinical spectra of HPE are extremely heterogeneous. Here, we report a Brazilian boy with lobar holoprosencephaly who was ascertained in a sample of 60 patients with HPE and HPE-like phenotypes and screened for molecular analysis of the major HPE causative genes: SHH, PTCH, SIX3, GLI2, and TGIF. This boy presented a p.K44N (c.132G>T) mutation in exon 2 of the TGIF gene which was inherited from his phenotypically normal mother. This mutation leads to lysine to arginine amino acid change and is predicted to be a damaging mutation. Clinical aspects involving variable phenotypical manifestations in different mutations of TGIF are discussed.
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