Molecular cloning and structure of the human interleukin-5 gene.

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作者：

TR Mizuta，T Tanabe，H Nakakubo，T Noma，T Honjo

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摘要：

We isolated the chromosomal gene for mouse interleukin-5 (IL-5) from genomic libraries using a cloned mouse IL-5 cDNA as probe. Nucleotide sequence determination of the IL-5 gene and its flanking regions showed that the gene was composed of four exons. The sequence homologies of the exons 1, 2, 3, and 4 of the human and murine IL-5 genes are 70, 79, 85, and 77%, respectively. TATA-like and CAAT-like sequences were found 25 and 52 base-pairs, respectively, upstream of the transcription initiation site which was identified by S1 mapping analysis. The nucleotide sequences of the mouse and human IL-5 genes were about 70% homologous in the 5â²-flanking region extending to 200 base-pairs upstream of the transcription initiation site, beyond which the homology declined rapidly. The sequence surrounding 50 base-pairs upstream of the initiation site was conserved among genes for other lymphokines: such as mouse granulocyte/macrophage colony stimulating factor, mouse IL-2. and mouse IL-4.

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关键词：

nucleotide sequence conserved sequences in 5′-flanking region transcription initiation site

DOI：

10.3109/08977198809000246

被引量：

204

年份：

1987