Identification and expression of novel isoforms of human stromal cell-derived factor 1.

Gene
Lan YuJian Wang

Abstract

Stromal Cell-derived factor 1 (SDF-1) is a CXC chemokine that binds to the CXCR4 receptor. Recent publication indicates that the SDF-1/CXCR4 signaling pathway plays a pivotal role during development and in many patho-physiological conditions including hematopoiesis, blood vessel formation, cancer metastasis, angiogenesis and HIV infection. Two human SDF-1 isoforms, SDF-1alpha and SDF-1beta, have been reported to date. Here we report the identification of four additional human SDF-1 isoforms derived from alternative splicing events, SDF-1gamma, SDF-1delta, SDF-1epsilon and SDF-1phi. These SDF-1 splice variants all share the same first three exons but contain different fourth exons. The human SDF-1 gene spans over 88 kilobase-pairs on chromosome 10. Using the semi-quantitative RT-PCR method, we determined the tissue distribution of these SDF-1 isoforms. SDF-1alpha and SDF-1beta share similar expression patterns and the highest expression were detected in liver, pancreas and spleen. SDF-1gamma seems to be the human orthologue of recently isolated rat SDF-1gamma, and its expression was only detected in the heart. SDF-1delta expression can be detected in several adult tissues but the highest expression was detected in fetal liver. W...Continue Reading

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