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Gros1, a potential growth suppressor on chromosome 1: its identity to basement membrane-associated proteoglycan, leprecan

Abstract

By immunoscreening with an antibody raised against a plasma membrane protein, we have cloned a growth suppressor gene, Gros1 and assigned it to short arm of human chromosome 1. Two alternatively spliced forms of the gene encoding 84- and 41-kDa (carboxy-terminus truncated) proteins were cloned. The two transcripts, 4.4 and 2.7 kb, were expressed weakly in most of the human tissues, with a high expression of the smaller transcript in placenta, ovary and testis. Normal human fibroblasts in culture showed two transcripts, with a higher level of expression of the 4.4 kb transcript. Transformed cells on the other hand showed predominant expression of the 2.7 kb transcript. Two Gros1 transcripts were also detected in most of the mouse tissues. Stable transfection of the mouse cDNA encoding the 85-kDa protein into NIH3T3 cells resulted in their slow growth and reduced colony-forming efficiency. Stable clones expressing antisense RNA on the other hand exhibited higher colony forming efficiency. While our data implied that Gros1 is a novel growth suppressor gene on human chromosome 1, an independent study has recently characterized its rat-homolog as a leucine proline-enriched novel basement membrane-associated proteoglycan leprecan. We describe here cloning, expression and biological activity analysis implying that this novel proteoglycan is a potential growth suppressor on chromosome 1p31, frequently altered in many malignancies.

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Kaul, S., Sugihara, T., Yoshida, A. et al. Gros1, a potential growth suppressor on chromosome 1: its identity to basement membrane-associated proteoglycan, leprecan. Oncogene 19, 3576–3583 (2000). https://doi.org/10.1038/sj.onc.1203696

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