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Transcription of the type-II procollagen gene (COL2A1) is very specifically restricted to a limited number of tissues, particularly cartilages. In order to identify transcription-control motifs we have sequenced the promoter region and the first intron of the human and mouse COL2A1 genes. With the assumption that these motifs should be well conserved during evolution, we have searched for potential elements important for the tissue-specific transcription of the COL2A1 gene by aligning the two sequences with each other and with the available rat type-II procollagen sequence for the promoter. With this approach we could identify specific evolutionarily well-conserved motifs in the promoter area. On the other hand, several suggested regulatory elements in the promoter region did not show evolutionary conservation. In the middle of the first intron we found a cluster of well-conserved transcription-control elements and we conclude that these conserved motifs most probably possess a significant function in the control of the tissue-specific transcription of the COL2A1 gene. We also describe locations of additional, highly conserved nucleotide stretches, which are good candidate regions in the search for binding sites of yet-uncharacterized cartilage-specific transcription regulators of the COL2A1 gene.

biochemical journal

Structural analysis of the regulatory elements of the type-II procollagen gene. Conservation of promoter and first intron sequences between human and mouse