GRHL2 (grainyhead like transcription factor 2)

Alias (NCBI)	Transcription Factor CP2-Like 3 (TFCP2L3)
	Brother Of Mammalian Grainyhead (BOM)
	Grainyhead-Like Protein 2 Homolog ALIAS Deafness Autosomal Dominant 28
HGNC (Hugo)	GRHL2
HGNC Alias symb	FLJ13782
	BOM
HGNC Previous name	DFNA28
	TFCP2L3
HGNC Previous name	"deafness, autosomal dominant 28
	transcription factor CP2-like 3
	grainyhead-like 2 (Drosophila)"
LocusID (NCBI)	79977
Atlas_Id	50630
Location	8q22.3  [Link to chromosome band 8q22]
Location_base_pair	Starts at 101492439 and ends at 101669724 bp from pter ( according to GRCh38/hg38-Dec_2013)  [Mapping GRHL2.png]
	Orange arrow indicates the GRHL2 (NC_000008.11) location on chromosome 8 on positive strand shown as black line. Green arrow indicates NCALD, the closest gene to GRHL2.

Note	The GRHL2 located on chromosome 8q22.3 is on the forward strand and spans 177287 bp on the genome. It has 16 exons. The primary mRNA transcript 1 (NM_024915.3) is 5231 bp in length and contains an open reading frame of 1878 bp (NCBI ,2017).
	Exons are shown in boxes; lines indicate introns. The encoding exons are in green. The start codon ATG and stop codon TGA are shown.
Description	The human GRHL2 gene is located on chromosome 8 and contains 16 exons.
Transcription	It appears that an internal 5' splicing site within the first exon of GRHL2 generates an alternate GRHL2 mRNA (NM_001330593) with a 203-base deletion containing the first Met encoding AUG codon in its 5'-end. This results in the utilization of the second AUG within exon 2 giving rise to an amino-terminally truncated (16 residues) GRHL2 isoform (NP_001317522.1), GRHL2v (17-625) that displays a disrupted transactivation function.

Note	GRHL2 variant 1 transcript encodes a 625 amino acids (aa) long protein (NP_079191.2). Based on GHRL2 and its Drosophila homolog GRH, the protein isoform 1 contains transcription activation domain at the amino-terminus (1-93 aa) and a large CP2 Transcription Factor domain between 119-438 aa that is responsible for DNA binding as well as a dimerization domain at the carboxyl-terminus (Attardi and Tijan, 1993, Kokoszynska et al., 2017; Uv, Thompson and Bray, 1994). Resulting from the alternative splicing of GHRL2 transcript, GRHL2 isoform 2 lacks the first 16 amino-acids and is a 609 aa long protein (NP_001317522.1). GRHL2 isoform is reported to counteract the oncogenic potential of GRHL2 isoform 1 by acting as a dominant negative manner (Werner et al., 2013). Proteomic analyses also suggest that GRHL2 is a phosphoprotein in various normal and cancerous tissues as well as in cell lines (Mertins et al., 2016).
	GRHL2, composed of 625 aa, contains a transactivation domain between 1-93 aa; a CP2 domain between 119-438 aa responsible for DNA binding and a dimerization/oligomerization domain at the carboxyl-terminus.
Description	GRHL2 protein is a transcription regulator that has a conserved CP2 domain.
Expression	In human adults, GRHL2 is expressed in the placenta, brain, kidney, prostate, thymus, lung, salivary gland, mammary gland, digestive tract, and pancreas (Wilanowski et al., 2002; Peters et al., 2002). It is also reported that MIR194 and MIR217 inhibit the cellular proliferation and promote cellular differentiation by targeting the GRHL2 translation (Yu et al., 2017; Zhu et al.,2016).
Localisation	GRHL2 is localized primarily in the nucleus (Chen et al., 2010; Petrof et al., 2014). GRHL2 is also observed to be localized in the cytoplasm and at the inner cell membrane (Petrof et al., 2014).
Function	GRHL2 is a transcription factor. The GRHL2 encodes a 71 kDa protein functions as DNA binding protein that interacts with permutations of the consensus sequence 5'-AACCGGTT-3' (Werner et al., 2013). GRHL2 appears to act as transcription repressor and/or activator depending on chromatin context of target genes (Mehrazarin.et al., 2015). Observations with experimental animal models indicate that the knock-out of, or nonsense mutations in, the mouse Grhl2 gene results in embryonic lethality due to defects in neural tube closure, epithelial morphogenesis, and barrier formation by de-regulation of cell junction protein expressions (Werth et al.,2010; Pyrgaki, Liu and Niswander, 2011). This finding emphasizes the essentiality of Grhl2 for epithelial and neural morphogenesis during embryogenesis. GRHL2 is also implicated in the carcinogenesis of various tissues and organs. Consistent with its role in epithelial morphogenesis, GRHL2 is shown act as tumor-suppressor by controlling the epithelial-mesenchymal transition (EMT), an essential characteristic of tumor progression (Wellner et al., 2009). In contrast, GRHL2 is also reported to act as an oncogene by promoting cell proliferation and survival (Cieply et al., 2013). Although underlying reasons are yet unclear, de-regulation of tissue/organ specific expression of the GHRL2 gene together with tissue/organ specific gene targets of GHRL2 is suggested to underlie the dual effects of GRHL2 on carcinogenesis (Wellner et al., 2009).
Homology	GRHL2 is a conserved gene among vertebrates and in Drosophila.

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