Jun 1, 2012

Divergent functions through alternative splicing: the Drosophila CRMP gene in pyrimidine metabolism, brain, and behavior

Genetics
Deanna H MorrisJohn M Rawls

Abstract

DHP and CRMP proteins comprise a family of structurally similar proteins that perform divergent functions, DHP in pyrimidine catabolism in most organisms and CRMP in neuronal dynamics in animals. In vertebrates, one DHP and five CRMP proteins are products of six genes; however, Drosophila melanogaster has a single CRMP gene that encodes one DHP and one CRMP protein through tissue-specific, alternative splicing of a pair of paralogous exons. The proteins derived from the fly gene are identical over 90% of their lengths, suggesting that unique, novel functions of these proteins derive from the segment corresponding to the paralogous exons. Functional homologies of the Drosophila and mammalian CRMP proteins are revealed by several types of evidence. Loss-of-function CRMP mutation modifies both Ras and Rac misexpression phenotypes during fly eye development in a manner that is consistent with the roles of CRMP in Ras and Rac signaling pathways in mammalian neurons. In both mice and flies, CRMP mutation impairs learning and memory. CRMP mutant flies are defective in circadian activity rhythm. Thus, DHP and CRMP proteins are derived by different processes in flies (tissue-specific, alternative splicing of paralogous exons of a single...Continue Reading

Mentioned in this Paper

Vertebrates
Nested Transcripts
Biochemical Pathway
Behavior, Animal
Protein Family
Exons
Chimeric Proteins, Recombinant
Drosophila melanogaster Proteins
Transcription, Genetic
Neurons

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