The SR protein B52/SRp55 is essential for Drosophila development - PubMed (original) (raw)
The SR protein B52/SRp55 is essential for Drosophila development
H Z Ring et al. Mol Cell Biol. 1994 Nov.
Abstract
B52, also called SRp55, is a 52-kDa member of the Drosophila SR protein family of general splicing factors. Escherichia coli-produced B52 is capable of both activating splicing and affecting the alternative splice site choice in human in vitro splicing reactions. Here we report the isolation of a B52 null mutant generated by remobilizing a P element residing near the B52 gene. The resulting deletion, B52(28), is confined to the B52 gene and its neighbor the Hrb87F gene. Second-instar larvae homozygous for the deletion are deficient in both B52 mRNA and protein. The B52 null mutant is lethal at the first- and second-instar larval stages. Germ line transformation of Drosophila flies with B52 genomic DNA rescues this lethality. Thus, B52 is an essential gene and has a critical role in Drosophila development. Larvae deficient in B52 are still capable of splicing the five endogenous pre-mRNAs tested here, including both constitutively and alternatively spliced genes. Therefore, B52 is not required for all splicing in vivo. This is the first in vivo deficiency analysis of a member of the SR protein family.
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