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Li Y, Tang L, Han Y, Zheng L, Zhen Q, Yang S, Gao M. Genetic Analysis of KRT9 Gene Revealed Previously Known Mutations and Genotype-Phenotype Correlations in Epidermolytic Palmoplantar Keratoderma. Front Genet 2019; 9:645. [PMID: 30666268 PMCID: PMC6330350 DOI: 10.3389/fgene.2018.00645] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 11/29/2018] [Indexed: 11/13/2022] Open
Abstract
Epidermolytic palmoplantar keratoderma (EPPK, OMIM 144200) is an autosomal dominant inherited disease, clinically characterized by diffuse yellowish thickening of the skin on the palms and soles, usually with erythematous borders developing during the first weeks or months after birth. Pathogenesis of EPPK is determined by mutations in the keratin gene (KRT9). Thirty three mutations in the KRT9 gene from 100 EPPK families have been identified. Among these, 23 mutations are located in the 1A region (a mutation hot spot region), 7 are located in the 2B region, and the remaining 3 are synonymous mutations. In this study, three heterozygous mutations (p.N161S, p.R163W, and p.R163Q), located in regions of the gene encoding the conserved central a-helix rod domain, were detected in the KRT9 gene of the three large Chinese families. This study confirms that codon 163 (48 of 100 cases) is a hot spot mutation site for KRT9. Additional findings identified p.N161S (4%) and p.R163W (4%) as potential hot spot mutations for EPPK associated with knuckle pads, and p.R163Q (15 of 100 cases) as the hot spot mutation of EPPK not occurring in combination with knuckle pads. In conjunction with future studies, this research may help lay the foundation for genetics counseling, prenatal diagnosis and clinical treatment of EPPK.
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Affiliation(s)
- Yuwei Li
- Institute of Dermatology and Department of Dermatology of First Affiliated Hospital, Hefei, China.,Key Laboratory of Dermatology, Ministry of Education, Anhui Medical University, Hefei, China
| | - Lili Tang
- Institute of Dermatology and Department of Dermatology of First Affiliated Hospital, Hefei, China.,Key Laboratory of Dermatology, Ministry of Education, Anhui Medical University, Hefei, China
| | - Yang Han
- Institute of Dermatology and Department of Dermatology of First Affiliated Hospital, Hefei, China.,Key Laboratory of Dermatology, Ministry of Education, Anhui Medical University, Hefei, China
| | - Liyun Zheng
- Institute of Dermatology and Department of Dermatology of First Affiliated Hospital, Hefei, China.,Key Laboratory of Dermatology, Ministry of Education, Anhui Medical University, Hefei, China
| | - Qi Zhen
- Institute of Dermatology and Department of Dermatology of First Affiliated Hospital, Hefei, China.,Key Laboratory of Dermatology, Ministry of Education, Anhui Medical University, Hefei, China
| | - Sen Yang
- Institute of Dermatology and Department of Dermatology of First Affiliated Hospital, Hefei, China
| | - Min Gao
- Institute of Dermatology and Department of Dermatology of First Affiliated Hospital, Hefei, China
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Liang YH, Liu QX, Huang L, Zeng K. A recurrent p.M157R mutation of keratin 9 gene in a Chinese family with epidermolytic palmoplantar keratoderma and literature review. Int J Dermatol 2014; 53:e375-9. [PMID: 24899405 DOI: 10.1111/ijd.12352] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Yanhua H Liang
- Department of Dermatology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, 510515, China.
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Liu WT, Ke HP, Zhao Y, Chen XL, Lu JJ, Du ZF, Yu D, Zhang XN. The most common mutation of KRT9, c.C487T (p.R163W), in epidermolytic palmoplantar keratoderma in two large Chinese pedigrees. Anat Rec (Hoboken) 2012; 295:604-9. [PMID: 22262370 DOI: 10.1002/ar.22409] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Accepted: 12/08/2011] [Indexed: 01/07/2023]
Abstract
Epidermolytic palmoplantar keratoderma (EPPK) is generally associated with dominant-negative mutations of the Keratin 9 gene (KRT9), and rarely with the Keratin 1 gene (KRT1). To date, a myriad of mutations has been reported with a high frequency of codon 163 mutations within the first exon of KRT9 in different populations. Notably, a distinct phenotypic heterogeneity, digital mutilation, was found recently in a 58-year-old female Japanese EPPK patient with p.R163W. Here, we report the most common mutation, c.C487T (p.R163W) of KRT9, in two large EPPK pedigrees from southeast China. The arginine residue in peptide position 163 remains almost constant in at least 47 intermediate filament proteins ranging from snail to human. A substitution in arginine alters both the charge and shape of the 1A rod domain and disrupts the function of the helix initiation motif of keratins, finally compromising the integrity of filaments and weakening their stability in the epidermis of palms and soles. We summarize the clinical symptoms of EPPK in Chinese and show that knuckle pads are associated with KRT9 mutations. We suggest that the frequency of p.R163W in Chinese EPPK patients (31.03%) is consistent with that in the general population (29.33%), and that codon 163 is truly a hotspot mutational site of KRT9.
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Affiliation(s)
- Wen-Ting Liu
- Department of Biochemistry and Genetics, National Education Base for Basic Medical Sciences, Institute of Cell Biology, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China
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