ARID2

AT-rich interactive domain-containing protein 2 (ARID2) is a protein that in humans is encoded by the ARID2 gene.

Function

ARID2 is a subunit of the PBAF chromatin-remodeling complex, which facilitates ligand-dependent transcriptional activation by nuclear receptors.

Structure

The ARID2 protein contains two conserved C-terminal C2H2 zinc fingers motifs, a region rich in the amino acid residues proline and glutamine, a RFX (regulatory factor X)-type winged-helix DNA-binding domain, and a conserved N-terminal AT-rich DNA interaction domain—the last domain for which the protein is named.

Clinical significance

Mutation studies have revealed ARID2 to be a significant tumor suppressor in many cancer subtypes. ARID2 mutations are prevalent in hepatocellular carcinoma and melanoma. Mutations are present in a smaller but significant fraction in a wide range of other tumors. ARID2 mutations are enriched in hepatitis C virus-associated hepatocellular carcinoma in the US and European patient populations compared with the overall mutation frequency.

Model organisms

Arid2 knockout mouse phenotype

Characteristic	Phenotype
Homozygote viability	Abnormal
Recessive lethal study	Abnormal
Fertility	Normal
Body weight	Normal
Anxiety	Normal
Neurological assessment	Normal
Grip strength	Normal
Hot plate	Normal
Dysmorphology	Normal
Indirect calorimetry	Normal
Glucose tolerance test	Normal
Auditory brainstem response	Normal
DEXA	Normal
Radiography	Normal
Body temperature	Normal
Eye morphology	Normal
Clinical chemistry	Normal
Haematology	Normal
Peripheral blood lymphocytes	Normal
Micronucleus test	Normal
Heart weight	Normal
Skin Histopathology	Normal
Brain histopathology	Normal
Eye Histopathology	Normal
Salmonella infection	Normal
Citrobacter infection	Normal
All tests and analysis from

The ARID2 gene, located on chromosome 12q in humans, consists of 21 exons; orthologs are known from mouse, rat, cattle, chicken, and mosquito. Model organisms have been used in the study of ARID2 function. A conditional knockout mouse line, called Arid2^{tm1a(EUCOMM)Wtsi} was generated as part of the International Knockout Mouse Consortium program, a high-throughput mutagenesis project to generate and distribute animal models of disease to interested scientists.

Male and female animals underwent a standardized phenotypic screen to determine the effects of deletion. Twenty six tests were carried out on mutant adult mice and two significant abnormalities were observed. A recessive lethal study found less homozygous mutant embryos during gestation than predicted by Mendelian ratio. In a second study, no homozygous mutant animals survived until weaning. The remaining tests were carried out on heterozygous mutant adult mice; these displayed no abnormalities.

External links

• ARID2 protein, human at the US National Library of Medicine Medical Subject Headings (MeSH)

This article incorporates text from the United States National Library of Medicine, which is in the public domain.