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T-STAR/ETOILE: a novel relative of SAM68 that interacts with an RNA-binding protein implicated in spermatogenesis

Lookup NU author(s): Dr Julian Venables, Professor David Elliott


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RBM is an RNA-binding protein encoded on the Y chromosome in mammals and is expressed only in the nuclei of male germ cells. Genetic evidence from infertile men implicates it in spermatogenesis, but its function is unknown. Of a number of potential partners for RBM identified by a yeast two-hybrid screen with testis cDNA, the most frequent isolates encoded a novel RNA-binding protein, termed T-STAR, that is closely related to SAM68, an Src-associated protein of unknown function. The mouse homologue was also cloned and designated etoile. It mapped to chromosome 15, while T-STAR mapped to the syntenic region on human chromosome 8. T-STAR/etoile is expressed primarily in the testis; in rat germ cells, the expression of both T-STAR/etoile and SAM68 is regulated during meiosis. Transfection of T-STAR/etoile fused with green fluorescent protein into HeLa cells caused an accumulation of protein in a novel compartment of the nucleus, adjacent to the nucleolus but distinct from the peri-nucleolar compartment. RBM and other hnRNP G family members are candidate downstream targets for regulation by T-STAR/ETOILE and SAM68.

Publication metadata

Author(s): Venables JP, Vernet C, Chew SL, Elliott DJ, Cowmeadow RB, Wu J, Cooke HJ, Artzt K, Eperon IC

Publication type: Article

Publication status: Published

Journal: Human Molecular Genetics

Year: 1999

Volume: 8

Issue: 6

Pages: 959-969

Print publication date: 06/06/1999

ISSN (print): 0964-6906

ISSN (electronic): 1460-2083

Publisher: Oxford University Press


DOI: 10.1093/hmg/8.6.959


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