[Phylogenetic analysis of the rapidly evolving SuUR gene in insects].
Different genome regions differ in replication timing during the S phase. Late-replicating sequences are often underreplicated in the Drosophila salivary-gland polytene chromosomes. The SuUR gene, whose mutation changes the replication time of late-replicating regions in salivary-gland cells, has been identified in Drosophila melanogaster. The SUUR protein lacks homologs by a BLAST search, and only moderate homology is observed between its N-terminal end and chromatin-remodeling proteins of the SWI2/SNF2 family. The gene and the protein were analyzed in insects. Orthologs of the SuUR gene were found in all annotated Drosophila species. The number of amino acid substitutions in the SUUR protein proved to be extremely high, corresponding to that of rapidly evolving genes. Orthologs with low homology were found in mosquitoes Anopheles gambiae, Aedes aegypti, and Culex quinquefasciatus. No orthologs of the SuUR gene were detected beyond Diptera.
A A
AA
Iurlova
I V
IV
Makunin
I F
IF
Zhimulev
D000330:Aedes / Q000235:genetics; D000595:Amino Acid Sequence; D000818:Animals; D000852:Anopheles / Q000235:genetics; D003465:Culex / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics*; D004330:Drosophila / Q000235:genetics; D029721:Drosophila Proteins / Q000235:genetics*; D019476:Insect Proteins / Q000235:genetics*; D008969:Molecular Sequence Data; D010802:Phylogeny; D017386:Sequence Homology, Amino Acid
D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D019476:Insect Proteins; C464850:SuUR protein, Drosophila