The identification of exons from the MED/PSACH region of human chromosome 19.
We have used exon amplification to identify putative transcribed sequences from an 823-kb contig consisting of 28 cosmids that form a minimum tiling path from the interval 19p12-p13.1. This region contains the genes responsible for multiple epiphyseal dysplasia (MED) and pseudoachondroplasia (PSACH). We have trapped 66 exons (an average of 2.4 exons per cosmid) from pools of 2 or 3 cosmids. The majority of exons (51.5%) show only weak similarity or no similarity (36.3%) to sequences in current databases. Six of 8 exons examined from these groups, however, show cross-species sequence conservation, indicating that many of them probably represent authentic exons. Eight exons show identity or significant similarity to ESTs or known genes, including the human TNF receptor 3 '-flanking region gene, human epoxide hydrolase (EPHX), human growth/differentiation factor (GOF-1), human myocyte-specific enhancer factor 2, the rat neurocan gene, and the human cartilage oligomeric matrix protein gene (COMP). Mutations in this latter gene have recently been shown to be responsible for MED and PSACH.
Li
Q Y
QY
Department of Genetics, Queen's Medical Centre, University of Nottingham, Nottingham NG7 2UH, UK.
Lennon
G G
GG
Brook
J D
JD
D000595:Amino Acid Sequence; D000818:Animals; D011508:Chondroitin Sulfate Proteoglycans / Q000737:chemistry / Q000235:genetics; D002888:Chromosomes, Human, Pair 19; D005091:Exons; D006801:Humans; D037181:Lectins, C-Type; D008969:Molecular Sequence Data; D009419:Nerve Tissue Proteins / Q000737:chemistry / Q000235:genetics; D058580:Neurocan; D010009:Osteochondrodysplasias / Q000235:genetics*; D017386:Sequence Homology, Amino Acid
D011508:Chondroitin Sulfate Proteoglycans; D037181:Lectins, C-Type; D009419:Nerve Tissue Proteins; D058580:Neurocan; C076817:NCAN protein, human