CGB2 (gene)

Chorionic gonadotropin, beta polypeptide 2
PDB rendering based on 1hcn.
Identifiers
Symbol	CGB2
External IDs	OMIM: 608824 HomoloGene: 137643 GeneCards: CGB2 Gene
Gene ontology Molecular function • hormone activity Cellular component • extracellular region Sources: Amigo / QuickGO
RNA expression pattern
More reference expression data
Orthologs
Species	Human	Mouse
Entrez	114336	n/a
Ensembl	ENSG00000104818	n/a
UniProt	F5H162	n/a
RefSeq (mRNA)	NM_033378	n/a
RefSeq (protein)	NP_203696	n/a
Location (UCSC)	Chr 19: 49.03 – 49.03 Mb	n/a
PubMed search		n/a

Choriogonadotropin subunit beta variant 2 is a protein that in humans is encoded by the CGB2 gene.^[1][2]

The beta subunit of chorionic gonadotropin (CGB) is encoded by six highly homologous and structurally similar genes that are arranged in tandem and inverted pairs on chromosome 19q13.3, and contiguous with the luteinizing hormone beta (LHB) subunit gene. The CGB genes are primarily distinguished by differences in the 5' untranscribed region. This gene was originally thought to be one of the two pseudogenes (CGB1 and CGB2) of CGB subunit, however, detection of CGB1 and CGB2 transcripts in vivo, and their presence on the polysomes, suggested that these transcripts are translated. To date, a protein product corresponding to CGB2 has not been isolated. The deduced sequence of the hypothetical protein of 132 aa does not share any similarity with that of functional CGB subunits PMID 8954017. However, a 163 aa protein, translated from a different frame, is about the same size, and shares 98% identity with other CGB subunits.^[2]

References

1. Policastro P, Ovitt CE, Hoshina M, Fukuoka H, Boothby MR, Boime I (Nov 1983). "The beta subunit of human chorionic gonadotropin is encoded by multiple genes". J Biol Chem 258 (19): 11492–9. PMID 6194155.
2. "Entrez Gene: CGB2 chorionic gonadotropin, beta polypeptide 2".

Further reading

• Bo M, Boime I (1992). "Identification of the transcriptionally active genes of the chorionic gonadotropin beta gene cluster in vivo". J. Biol. Chem. 267 (5): 3179–84. PMID 1371113.
• Policastro PF, Daniels-McQueen S, Carle G, Boime I (1986). "A map of the hCG beta-LH beta gene cluster". J. Biol. Chem. 261 (13): 5907–16. PMID 2422163.
• Julier C, Weil D, Couillin P, et al. (1984). "The beta chorionic gonadotropin-beta luteinizing gene cluster maps to human chromosome 19". Hum. Genet. 67 (2): 174–177. doi:10.1007/BF00272995. PMID 6204923.
• Talmadge K, Boorstein WR, Fiddes JC (1984). "The human genome contains seven genes for the beta-subunit of chorionic gonadotropin but only one gene for the beta-subunit of luteinizing hormone". DNA 2 (4): 281–289. doi:10.1089/dna.1983.2.281. PMID 6319099.
• Talmadge K, Vamvakopoulos NC, Fiddes JC (1984). "Evolution of the genes for the beta subunits of human chorionic gonadotropin and luteinizing hormone". Nature 307 (5946): 37–40. doi:10.1038/307037a0. PMID 6690982.
• Dirnhofer S, Hermann M, Hittmair A, et al. (1997). "Expression of the human chorionic gonadotropin-beta gene cluster in human pituitaries and alternate use of exon 1". J. Clin. Endocrinol. Metab. 81 (12): 4212–4217. doi:10.1210/jc.81.12.4212. PMID 8954017.
• Venter JC, Adams MD, Myers EW, et al. (2001). "The sequence of the human genome". Science 291 (5507): 1304–1351. doi:10.1126/science.1058040. PMID 11181995.
• Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–16903. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932.
• Hallast P, Rull K, Laan M (2007). "The evolution and genomic landscape of CGB1 and CGB2 genes". Mol. Cell. Endocrinol. 260-262: 2–11. doi:10.1016/j.mce.2005.11.049. PMC 2599907. PMID 17055150.