Comparative analysis of the RED1 and RED2 A-to-I RNA editing genes from mammals, pufferfish and zebrafish - PubMed (original) (raw)
Comparative Study
. 2000 May 30;250(1-2):41-51.
doi: 10.1016/s0378-1119(00)00174-8.
Affiliations
- PMID: 10854777
- DOI: 10.1016/s0378-1119(00)00174-8
Comparative Study
Comparative analysis of the RED1 and RED2 A-to-I RNA editing genes from mammals, pufferfish and zebrafish
D Slavov et al. Gene. 2000.
Abstract
One type of RNA editing involves the deamination of adenosine (A) residues to inosines (I) at specific sites in specific pre-mRNAs. These inosines are subsequently read as guanosines by the ribosome, with potentially significant consequences for protein sequence. In mammals, two such A-to-I RNA editases are RED1, which edits some serotonin and glutamate receptors, and RED2, with unidentified substrates. To study the evolutionary conservation among these editases, we have isolated homologous genes from the Japanese pufferfish, Fugu rubripes. Fugu has two genes homologous to Red1 that are similar in size and organization and that show a fivefold compaction relative to the human gene; they differ, however, in their base compositional features. The Fugu gene for RED2 is unusually large, spanning more than 50kb; within the largest intron, there is evidence for a novel gene on the opposite strand. Because of these unusual features, the partial genomic structure was determined for the mouse RED2 gene. A partial cDNA for RED1 was also isolated from zebrafish. Comparisons between fish and between fish and mammals of the protein sequences show that the catalytic domains are highly conserved for each gene, while the RNA-binding domains vary within a single protein in their levels of conservation. Different levels of conservation among domains of different functional roles may reflect differences in editase substrate specificity and/or substrate sequence conservation.
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