All of them are monoallelic except for the two recent reports showing that biallelic variants in COL2A1 can cause spondyloepiphyseal dysplasia congenita in two children.
Our study contributed to the further expansion of the COL2A1 mutation spectrum and provided more information concerning SEDC in the Chinese population through literature review.
Our study extends the mutation spectrum of SEDC and confirms genotype-phenotype relationship between mutations at glycine in the triple helix of the alpha-1(II) chains of the COL2A1 and clinical findings of SEDC, which may be helpful in the genetic counseling of patients with SEDC.
A study of the clinical and radiological features in a cohort of 93 patients with a COL2A1 mutation causing spondyloepiphyseal dysplasia congenita or a related phenotype.
Our study extends the mutation spectrum of SEDC and confirms genotype-phenotype relationship between mutations at glycine in the triple helix of the alpha-1(II) chains of the COL2A1 and clinical findings of SEDC, which may be helpful in the genetic counseling of patients with SEDC.
Our study extends the mutation spectrum of SEDC and confirms genotype-phenotype relationship between mutations in the COL2A1 gene and clinical findings of SEDC.
Pseudoachondroplasia and multiple epiphyseal dysplasia: a 7-year comprehensive analysis of the known disease genes identify novel and recurrent mutations and provides an accurate assessment of their relative contribution.
The pregnant woman we previously reported with SEDC carried the G to A substitution at nucleotide 1510 in exon 23 of COL2A1 gene, which caused a change from glycine to serine at codon 504 (G504S).
Arginine to cysteine mutations are rather infrequent COL2A1 mutations which cause a spectrum of phenotypes including classic SEDC and Stickler dysplasia, but also some unusual entities that have not yet been recognised and described as type II collagenopathies.
Phenotype of the twin girls resembles spondyloepiphyseal dysplasia congenita Spranger-Wiedemann (SEDC-SW), but shortening of the stature is more severe and the cranioface is normal.
Most COL2A1 mutations occur in the triple helical region of alpha 1(II) chains: the SED spectrum is mostly attributed to missense mutations that substitute bulky amino acids for glycine residues, STD-I to haploinsufficiency of truncation mutations, and KND to exon skipping due to splice-site mutations.