Type II collagen gene variants and inherited osteonecrosis of the femoral head

Yu Fen Liu, Wei Ming Chen, Yung Feng Lin, Ruei Cheng Yang, Ming Wei Lin, Ling Hui Li, Ya Hui Chang, Yuh Shan Jou, Pei Yu Lin, Jih Shyun Su, Shiu Feng Huang, Kwang Jen Hsiao, Cathy S.J. Fann, Hun Way Hwang, Yuan Tsong Chen, Shih Feng Tsai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

152 Scopus citations

Abstract

BACKGROUND Avascular necrosis of the femoral head (ANFH) causes disability that often requires surgical intervention. Most cases of ANFH are sporadic, but we identified three families in which there was autosomal dominant inheritance of the disease and mapped the chromosomal position of the gene to 12q13. METHODS We carried out haplotype analysis in the families, selected candidate genes from the critical interval for ANFH on 12q13, and sequenced the promoter and exonic regions of the type II collagen gene (COL2A1) from persons with inherited and sporadic forms of ANFH. RESULTS We identified a G→A transition in exon 50 of COLZA1 in affected members of a four-generation family with ANFH. This transition predicts the replacement of glycine with serine at codon 1170 in a GXY repeat of type II collagen. Another pedigree was shown to harbor the same transition, but the mutant allele occurred on a different haplotype background. In a third family, a G→A transition in exon 33 of the gene, causing a glycine-to-serine change at codon 717, was detected. No mutation was found in the COL2A1 coding region in sporadic cases of ANFH. CONCLUSIONS All the patients with familial ANFH whom we studied carried COL2A1 mutations. In families with ANFH, haplotype and sequence analysis of the COL2A1 gene can be used to identify carriers of the mutant allele before the onset of clinical symptoms, allowing the initiation of measures that may delay progression of the disease.

Original languageEnglish
Pages (from-to)2294-2301
Number of pages8
JournalNew England Journal of Medicine
Volume352
Issue number22
DOIs
StatePublished - 2 Jun 2005

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