RGD Reference Report - Cloning and characterization of granulosa cell high-mobility group (HMG)-box protein-1, a novel HMG-box transcriptional regulator strongly expressed in rat ovarian granulosa cells.

General

Cloning and characterization of granulosa cell high-mobility group (HMG)-box protein-1, a novel HMG-box transcriptional regulator strongly expressed in rat ovarian granulosa cells.
Authors:	Kajitani, T Mizutani, T Yamada, K Yazawa, T Sekiguchi, T Yoshino, M Kawata, H Miyamoto, K
Citation:	Kajitani T, etal., Endocrinology 2004 May;145(5):2307-18. Epub 2004 Feb 05.
RGD ID:	1302820
Pubmed:	PMID:14764631 (View Abstract at PubMed)
DOI:	DOI:10.1210/en.2003-1343 (Journal Full-text)
Specific events in the ovary are dependent on gene expression in the tissue. By screening a rat ovarian granulosa cell cDNA library, a cDNA clone encoding a novel transcription factor-like protein containing a high-mobility group-box, referred to as granulosa cell high-mobility group-box protein-1 (GCX-1), was identified. The expression of GCX-1 is restricted to the hypothalamus, pituitary, testis, uterus, and ovary but was not detected in the adrenal gland. An in situ hybridization study revealed that the expression of GCX-1 was restricted to granulosa cell layers in early-stage follicles, and the expression was very low in large antral follicles and the corpus luteum, but localized expression in the testis or pituitary was not clear. Endogenous GCX-1 protein in the granulosa cells was identified by a Western blot analysis, and an analysis using the green fluorescence protein-GCX-1 fusion protein revealed that the GCX-1 protein was localized in the cell nucleus. GAL4 fusion protein-based assays demonstrated that GCX-1 is a potent transcriptional activator, and its putative transactivation domain was mapped to the region between amino acid residues 25 and 63 from the N terminus. These data strongly suggest that GCX-1 is likely a novel transcriptional activator that is exclusively expressed in reproductive tissues involving the hypothalamo-pituitary-gonadal axis, and functions as a specific regulator of follicular development, and may also participate in other specific events related to reproduction, particularly in the female.

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Biological Process

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Term	Qualifier	Evidence	With	Reference	Notes	Source	Original Reference(s)
female gonad development		IEP		1302820		RGD
positive regulation of transcription by RNA polymerase II		IDA		1302820		RGD
response to gonadotropin		IEP		1302820		RGD

Molecular Function

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Term	Qualifier	Evidence	With	Reference	Notes	Source	Original Reference(s)
RNA polymerase II-specific DNA-binding transcription factor binding		IPI	Giot1 (Rattus norvegicus)	1302820		RGD

Objects Annotated

Genes (Rattus norvegicus)

Tox2 (TOX high mobility group box family member 2)

Additional Information

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Cloning and characterization of granulosa cell high-mobility group (HMG)-box protein-1, a novel HMG-box transcriptional regulator strongly expressed in rat ovarian granulosa cells.