The gene organization, chromosome location, and expression of a 55-kDa matrix protein (PRELP) of human articular cartilage

Genomics
J GroverP J Roughley

Abstract

The gene corresponding to a 55-kDa matrix protein previously described in adult human articular cartilage was characterized by sequencing of genomic clones. The deduced protein sequence corresponds to the recently described matrix protein PRELP. The protein was encoded by messages of 1.7, 4.6, and 6.7 kb, whose relative abundance increased as their size decreased. The message heterogeneity appears to originate from variation in the length of the 3'-untranslated region, with the smallest message being contained within the reported sequence and the larger messages having extended 3'-untranslated regions. Two introns were identified within the genomic sequence encoding the smallest message. The first intron of about 6.7 kb resides 16 nucleotides prior to the translation initiation codon, and the second intron of about 2.6 kb resides 173 nucleotides prior to the translation termination codon. The gene, which encompasses at least 16 kb of genomic DNA, was shown to reside on chromosome 1q32. Primer extension techniques were used to establish that the coding sequence commences 199 bp downstream from the major transcription start site. Analysis of the DNA sequence upstream from the transcription start site reveals the presence of numer...Continue Reading

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