Mutation analysis and characterization of COL7A1 mutations in dystrophic epidermolysis bullosa.
Dystrophic epidermolysis bullosa (DEB) is inherited in both an autosomal dominant DEB and autosomal recessive manner RDEB, both of which result from mutations in the type VII collagen gene (COL7A1). To date, 324 pathogenic mutations have been detected within COL7A1 in different variants of DEB; many mutations are clustered in exon 73 (10.74%) which is close to the 39 amino acid interruption region. Dominant dystrophic epidermolysis bullosa usually involves glycine substitutions within the triple helix of COL7A1 although other missense mutations, deletions or splice-site mutations may underlie some cases. In recessive dystrophic epidermolysis bullosa, the mutations include nonsense, splice site, deletions or insertions, 'silent' glycine substitutions within the triple helix and non-glycine missense mutations within the triple helix or non-collagenous NC-2 domain. The nature of mutations in COL7A1 and their positions correlate reasonably logically with the severity of the resulting phenotypes.
Department of Dermatology, St George Hospital, Sydney, Australia.
Ningning
N
Dang
Dédée F
DF
Murrell
D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D001483:Base Sequence; D024143:Collagen Type VII / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D004252:DNA Mutational Analysis; D016108:Epidermolysis Bullosa Dystrophica / Q000235:genetics* / Q000378:metabolism / Q000473:pathology / Q000628:therapy; D005091:Exons; D015316:Genetic Therapy; D005998:Glycine / Q000235:genetics; D006801:Humans; D040582:Inheritance Patterns / Q000235:genetics; D008969:Molecular Sequence Data; D009154:Mutation; D010641:Phenotype; D012867:Skin / Q000378:metabolism / Q000473:pathology
D024143:Collagen Type VII; D005998:Glycine