The rod domain is not essential for the function of plectin in maintaining tissue integrity.

Abstract:

:Epidermolysis bullosa simplex associated with late-onset muscular dystrophy (EBS-MD) is an autosomal recessive disorder resulting from mutations in the plectin gene. The majority of these mutations occur within the large exon 31 encoding the central rod domain and leave the production of a low-level rodless plectin splice variant unaffected. To investigate the function of the rod domain, we generated rodless plectin mice through conditional deletion of exon 31. Rodless plectin mice develop normally without signs of skin blistering or muscular dystrophy. Plectin localization and hemidesmosome organization are unaffected in rodless plectin mice. However, superresolution microscopy revealed a closer juxtaposition of the C-terminus of plectin to the integrin β4 subunit in rodless plectin keratinocytes. Wound healing occurred slightly faster in rodless plectin mice than in wild-type mice, and keratinocytes migration was increased in the absence of the rod domain. The faster migration of rodless plectin keratinocytes is not due to altered biochemical properties because, like full-length plectin, rodless plectin is a dimeric protein. Our data demonstrate that rodless plectin can functionally compensate for the loss of full-length plectin in mice. Thus the low expression level of plectin rather than the absence of the rod domain dictates the development of EBS-MD.

journal_name

Mol Biol Cell

authors

Ketema M,Secades P,Kreft M,Nahidiazar L,Janssen H,Jalink K,de Pereda JM,Sonnenberg A

doi

10.1091/mbc.E15-01-0043

subject

Has Abstract

pub_date

2015-07-01 00:00:00

pages

2402-17

issue

13

eissn

1059-1524

issn

1939-4586

pii

mbc.E15-01-0043

journal_volume

26

pub_type

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