Identification of a distinct family of genes encoding atypical odorant-binding proteins in the malaria vector mosquito, Anopheles gambiae.
We performed a genome-wide analysis for candidate odorant-binding protein (OBP) genes in the malaria vector Anopheles gambiae (Ag). We identified fifty-seven putative genes including sixteen genes predicted to encode distinct, higher molecular weight proteins that lack orthologues in Drosophila. Expression analysis indicates that several of these atypical AgOBPs are transcribed in chemosensory organs in adult and immature stages. Phylogenetic analysis of the Anopheles and Drosophila OBP families reveals these proteins fall into several clusters based on sequence similarity and suggests the atypical AgOBP genes arose in the mosquito lineage after the divergence of mosquitoes and flies. The identification of these AgOBP genes is the first step towards determining their biological roles in this economically and medically important insect.
Department of Pharmacology, Center for Basic Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX 75390-9111, USA.
P X
PX
Xu
L J
LJ
Zwiebel
D P
DP
Smith
D000595:Amino Acid Sequence; D000818:Animals; D000852:Anopheles / Q000235:genetics*; D002874:Chromosome Mapping; D016000:Cluster Analysis; D017931:DNA Primers; D004331:Drosophila melanogaster / Q000235:genetics*; D015870:Gene Expression; D015698:Genomic Library; D008969:Molecular Sequence Data; D010802:Phylogeny; D018035:Receptors, Odorant / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment
D017931:DNA Primers; D018035:Receptors, Odorant; C045648:odorant-binding protein