PMID- 1849271 OWN - NLM STAT- MEDLINE DCOM- 19910506 LR - 20190501 IS - 0027-8424 (Print) IS - 1091-6490 (Electronic) IS - 0027-8424 (Linking) VI - 88 IP - 7 DP - 1991 Apr 1 TI - Cloning of the gamma-aminobutyric acid (GABA) rho 1 cDNA: a GABA receptor subunit highly expressed in the retina. PG - 2673-7 AB - Type A gamma-aminobutyric acid (GABAA) receptors are a family of ligand-gated chloride channels that are the major inhibitory neurotransmitter receptors in the nervous system. Molecular cloning has revealed diversity in the subunits that compose this heterooligomeric receptor, but each previously elucidated subunit displays amino acid similarity in conserved structural elements. We have used these highly conserved regions to identify additional members of this family by using the polymerase chain reaction (PCR). One PCR product was used to isolate a full-length cDNA from a human retina cDNA library. The mature protein predicted from this cDNA sequence in 458 amino acids long and displays between 30 and 38% amino acid similarity to the previously identified GABAA subunits. This gene is expressed primarily in the retina but transcripts are also detected in the brain, lung, and thymus. Injection of Xenopus oocytes with RNA transcribed in vitro produces a GABA-responsive chloride conductance and expression of the cDNA in COS cells yields GABA-displaceable muscimol binding. These features are consistent with our identification of a GABA subunit, GABA rho 1, with prominent retinal expression that increases the diversity and tissue specificity of this ligand-gated ion-channel receptor family. FAU - Cutting, G R AU - Cutting GR AD - Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD 21205. FAU - Lu, L AU - Lu L FAU - O'Hara, B F AU - O'Hara BF FAU - Kasch, L M AU - Kasch LM FAU - Montrose-Rafizadeh, C AU - Montrose-Rafizadeh C FAU - Donovan, D M AU - Donovan DM FAU - Shimada, S AU - Shimada S FAU - Antonarakis, S E AU - Antonarakis SE FAU - Guggino, W B AU - Guggino WB FAU - Uhl, G R AU - Uhl GR AU - et al. LA - eng SI - GENBANK/D90291 SI - GENBANK/D90292 SI - GENBANK/D90293 SI - GENBANK/D90294 SI - GENBANK/D90295 SI - GENBANK/D90296 SI - GENBANK/D90297 SI - GENBANK/D90298 SI - GENBANK/M62321 SI - GENBANK/M62323 SI - GENBANK/M62400 PT - Comparative Study PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - Proc Natl Acad Sci U S A JT - Proceedings of the National Academy of Sciences of the United States of America JID - 7505876 RN - 0 (Macromolecular Substances) RN - 0 (Oligonucleotide Probes) RN - 0 (RNA, Messenger) RN - 0 (Receptors, GABA-A) RN - 124-87-8 (Picrotoxin) RN - 56-12-2 (gamma-Aminobutyric Acid) SB - IM MH - Amino Acid Sequence MH - Animals MH - Base Sequence MH - Cell Line MH - Cloning, Molecular MH - Female MH - Gene Library MH - Humans MH - Macromolecular Substances MH - Membrane Potentials/drug effects MH - Molecular Sequence Data MH - Oligonucleotide Probes MH - Oocytes/drug effects/physiology MH - Organ Specificity MH - Picrotoxin/pharmacology MH - Polymerase Chain Reaction MH - RNA, Messenger/genetics MH - Receptors, GABA-A/drug effects/*genetics/physiology MH - Retina/*physiology MH - Sequence Homology, Nucleic Acid MH - Transfection MH - Xenopus MH - gamma-Aminobutyric Acid/metabolism/pharmacology PMC - PMC51300 EDAT- 1991/04/01 00:00 MHDA- 1991/04/01 00:01 PMCR- 1991/10/01 CRDT- 1991/04/01 00:00 PHST- 1991/04/01 00:00 [pubmed] PHST- 1991/04/01 00:01 [medline] PHST- 1991/04/01 00:00 [entrez] PHST- 1991/10/01 00:00 [pmc-release] AID - 10.1073/pnas.88.7.2673 [doi] PST - ppublish SO - Proc Natl Acad Sci U S A. 1991 Apr 1;88(7):2673-7. doi: 10.1073/pnas.88.7.2673.