Seven evolutionarily conserved human rhodopsin G protein-coupled receptors lacking close relatives.
We report seven new members of the superfamily of human G protein-coupled receptors (GPCRs) found by searches in the human genome databases, termed GPR100, GPR119, GPR120, GPR135, GPR136, GPR141, and GPR142. We also report 16 orthologues of these receptors in mouse, rat, fugu (pufferfish) and zebrafish. Phylogenetic analysis shows that these are additional members of the family of rhodopsin-type GPCRs. GPR100 shows similarity with the orphan receptor SALPR. Remarkably, the other receptors do not have any close relative among other known human rhodopsin-like GPCRs. Most of these orphan receptors are highly conserved through several vertebrate species and are present in single copies. Analysis of expressed sequence tag (EST) sequences indicated individual expression patterns, such as for GPR135, which was found in a wide variety of tissues including eye, brain, cervix, stomach and testis. Several ESTs for GPR141 were found in marrow and cancer cells, while the other receptors seem to have more restricted expression patterns.
Fredriksson
Robert
R
Department of Neuroscience, Uppsala University, BMC, Box 593, 751 24 Uppsala, Sweden.
Höglund
Pär J
PJ
Gloriam
David E I
DE
Lagerström
Malin C
MC
Schiöth
Helgi B
HB
D000595:Amino Acid Sequence; D000818:Animals; D030562:Databases, Protein; D019143:Evolution, Molecular; D020224:Expressed Sequence Tags; D015870:Gene Expression / Q000235:genetics; D015894:Genome, Human; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D009928:Organ Specificity; D010802:Phylogeny; D051381:Rats; D043562:Receptors, G-Protein-Coupled / Q000235:genetics* / Q000378:metabolism; D012243:Rhodopsin / Q000235:genetics* / Q000378:metabolism; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D023741:Takifugu; D015027:Zebrafish
C519853:FFAR4 protein, human; D043562:Receptors, G-Protein-Coupled; D012243:Rhodopsin