Missense and silent mutations in COL2A1 result in Stickler syndrome but via different molecular mechanisms.
Stickler syndrome due to mutations in COL2A1 is usually the result of premature termination codons and nonsense mediated decay resulting in haploinsufficiency of type II collagen. Here we present two missense mutations and one apparently silent mutation that each result in Stickler syndrome, but via different molecular mechanisms. One alters the translation initiating ATG codon. The second mutation is a unique glycine substitution in the minor collagen helix of the procollagen. To our knowledge a glycine substitution has not previously been reported in this region of fibrillar procollagens. The third mutation appears to be a silent change altering a GGC codon to GGT both for glycine, but use of a splicing reporter assay demonstrates that it results in missplicing and a shift in the reading frame.
Richards
Allan J
AJ
Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge, United Kingdom.
Laidlaw
Maureen
M
Meredith
Sarah P
SP
Shankar
Pallavi
P
Poulson
Arabella V
AV
Scott
John D
JD
Snead
Martin P
MP
D000328:Adult; D017398:Alternative Splicing / Q000235:genetics*; D019943:Amino Acid Substitution / Q000235:genetics; D002478:Cells, Cultured; D024043:Collagen Type II / Q000235:genetics*; D004252:DNA Mutational Analysis; D005091:Exons; D005260:Female; D005347:Fibroblasts / Q000378:metabolism; D005799:Genes, Dominant; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D008297:Male; D009030:Mosaicism; D020125:Mutation, Missense; D010003:Osteoarthritis / Q000235:genetics*; D010159:Palate / Q000002:abnormalities; D010375:Pedigree; D011110:Polymorphism, Genetic; D012163:Retinal Detachment / Q000235:genetics*; D013577:Syndrome; D014822:Vitreous Body / Q000002:abnormalities*
C499177:COL2A1 protein, human; D024043:Collagen Type II