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Publication : Mice expressing a mutant Krt75 (K6hf) allele develop hair and nail defects resembling pachyonychia congenita.

First Author  Chen J Year  2008
Journal  J Invest Dermatol Volume  128
Issue  2 Pages  270-9
PubMed ID  17851587 Mgi Jnum  J:127018
Mgi Id  MGI:3762616 Doi  10.1038/sj.jid.5701038
Citation  Chen J, et al. (2008) Mice expressing a mutant Krt75 (K6hf) allele develop hair and nail defects resembling Pachyonychia Congenita. J Invest Dermatol 128(2):270-9
abstractText  KRT75 (formerly known as K6hf) is one of the isoforms of the keratin 6 (KRT6) family located within the type II cytokeratin gene cluster on chromosome 12 of humans and chromosome 15 of mice. KRT75 is expressed in the companion layer and upper germinative matrix region of the hair follicle, the medulla of the hair shaft, and in epithelia of the nail bed. Dominant mutations in members of the KRT6 family, such as in KRT6A and KRT6B cause pachyonychia congenita (PC) -1 and -2, respectively. To determine the function of KRT75 in skin appendages, we introduced a dominant mutation into a highly conserved residue in the helix initiation peptide of Krt75. Mice expressing this mutant form of Krt75 developed hair and nail defects resembling PC. This mouse model provides in vivo evidence for the critical roles played by Krt75 in maintaining hair shaft and nail integrity. Furthermore, the phenotypes observed in our mutant Krt75 mice suggest that KRT75 may be a candidate gene for screening PC patients who do not exhibit obvious mutations in KRT6A, KRT6B, KRT16, or KRT17, especially those with extensive hair involvement.
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