Premium
Identification and functional characterization of a novel transglutaminase 1 gene mutation associated with autosomal recessive congenital ichthyosis
Author(s) -
Zhang SanQuan,
Li ChangXing,
Gao XinQian,
Qiu WenYuan,
Chen Quan,
Li XueMei,
Zhou Xin,
Tian Xin,
Tang ZhiPing,
Zhao Tian,
Zhang Fang,
Zhang XiBao
Publication year - 2016
Publication title -
international journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 93
eISSN - 1365-4632
pISSN - 0011-9059
DOI - 10.1111/ijd.12806
Subject(s) - hacat , missense mutation , microbiology and biotechnology , biology , congenital ichthyosis , exon , genetics , filaggrin , compound heterozygosity , mutant , gene mutation , mutation , ichthyosis , gene , immunology , atopic dermatitis , cell culture
Background Autosomal recessive congenital ichthyosis ( ARCI ) is a group of genetically heterogeneous diseases. Mutations in transglutaminase ( TG ase) 1 gene ( TGM 1, OMIM 190195) have been implicated in ARCI . However, little is known about TGM 1 mutations in the Chinese population, and no functional studies have investigated the biological effect of mutant TGM1 on human epidermal keratinocytes (HaCaT) cells. Objectives To identify the pathogenic mutations of TGM 1 gene in two Chinese siblings with ARCI and gain insight into functional consequences of these mutations. Methods Fifteen exons and flanking splice sites of TGM1 gene were amplified by polymerase chain reaction and then underwent bidirectional Sanger sequencing. The HaCaT cells were transfected with lentiviral vectors, which overexpressed either wild‐type or mutant TGM1 cDNA s with deleted homeodomain. Cell proliferation and cell cycle progression were detected. The expression of cyclin D1, cyclin B1, CDK4, TGM1, K10, involucrin, and filaggrin proteins were investigated by Western blot analysis. Results We found two compound heterozygous missense mutations (c.515C>T, R143C in exon 3 and c.759C>T, S212F in exon 4) in both siblings. HaCaT cells transfected with mutant TGM1 cDNA s displayed a lower growth rate and delayed S phase while overexpression of wild‐type TGM1 cDNA s led to accelerated growth. HaCaT cells transfected with mutant TGM1 cDNA s displayed lower expression of differentiation markers such as involucrin and filaggrin. Our findings suggest that the compound heterozygous missense (c.515C>T, R143C) mutations in exon 3 and missense (c.759C>T, S212F) mutations in exon 4 result in the phenotype of ARCI. TGM1 mutations can suppress keratinocyte growth and cornified cell envelope formation.