Three novel EXT1 and EXT2 gene mutations in Taiwanese patients with multiple exostoses.
Multiple osteochondromatosis, also known as hereditary multiple exostoses (HME), is an inherited autosomal dominant disorder characterized by the presence of multiple exostoses on the long bones. These exostoses are benign cartilaginous tumors (enchondromata). Three different exostosis (EXT) loci on chromosomes 8q (exostosin 1, EXT1), 11p (exostosin 2, EXT2) and 19p (exostosin 3, EXT3) have been reported. Recently, the EXT1 and EXT2 genes were identified by positional cloning. Using polymerase chain reaction and direct sequencing, we analyzed the EXT1 and EXT2 genes in three familial cases and one sporadic case of HME in Taiwanese patients. We found three novel mutations (S277X in the EXT1 gene, and G194X and 939+1G>A in the EXT2 gene) and a known mutation (Q172X in the EXT2 gene). Mutation analysis in families with HME allows for genetic counseling and prenatal diagnosis.
Chen
Wen-Chau
WC
Department of Emergency Medicine, National Cheng-Kung University Hospital, Tainan, Taiwan.
Chi
Chih-Hsien
CH
Chuang
Chia-Chang
CC
Jou
I-Ming
IM
D004252:DNA Mutational Analysis; D005097:Exostoses, Multiple Hereditary / Q000235:genetics*; D006801:Humans; D009154:Mutation; D017351:N-Acetylglucosaminyltransferases / Q000235:genetics*; D000099065:Exostosin 2; D000099058:Exostosin 1
D017351:N-Acetylglucosaminyltransferases; D000099058:Exostosin 1; D000099065:Exostosin 2