Abstract:
:In the process of cloning the gene (Scyd1) encoding the mouse CX3C chemokine fractalkine, we identified a novel cDNA that encodes a chimeric molecule termed fracTARC. This molecule is a variant form of the mouse CC chemokine, TARC (for thymus- and activation-regulated chemokine), bearing the fractalkine signal sequence instead of its own. Analysis of the genomic organization of the two genes revealed that Scyd1 and Scya17, encoding TARC, are tightly linked on chromosome 8 and that fracTARC is generated by alternative splicing of the two genes. Among tissues in which Scyd1 mRNA is expressed, fracTARC mRNA is selectively expressed in brain and kidney, indicating that fracTARC mRNA is generated by tissue-specific alternative splicing under the control of the Scyd1 promoter. On the other hand, Scya17 and the fracTARC gene are reciprocally expressed in thymus, brain, lung, and kidney and are never expressed in the same tissue. These expression profiles indicate that tissue specificity of Scya17 is precisely regulated by two independent mechanisms, one by transcription from its own promoter and the other from the promoter of Scyd1 followed by tissue-specific alternative splicing. These data provide evidence for a novel mechanism that controls gene expression of two independent genes of the same family. Such a mechanism may also operate in other genes that are tightly linked on the same chromosome.
journal_name
Genomicsjournal_title
Genomicsauthors
Hiroyama T,Iwama A,Nakamura Y,Nakauchi Hdoi
10.1006/geno.2001.6585subject
Has Abstractpub_date
2001-07-01 00:00:00pages
3-5issue
1-3eissn
0888-7543issn
1089-8646pii
S0888-7543(01)96585-1journal_volume
75pub_type
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