Retinoic acid receptor alpha
Retinoic acid receptor alpha (RAR-α), also known as NR1B1 (nuclear receptor subfamily 1, group B, member 1) is a nuclear receptor that in humans is encoded by the RARA gene.[5][6]
NR1B1 is a gene with a protein product and has a chromosomal location of 17q21.2. RARA codes for the nuclear hormone receptor Retinoic Acid Receptor, Alpha subtype, and are themselves transcription factors. There are another 2 subtypes of RARs, Beta subtype, and Gamma subtype.[7][8]
Function[]
Retinoid signaling is transduced by 2 families of nuclear receptors, retinoic acid receptor (RAR) and retinoid X receptor (RXR), which form RXR/RAR heterodimers. In the absence of ligand, DNA-bound RXR/RARA represses transcription by recruiting the corepressors NCOR1, SMRT (NCOR2), and histone deacetylase. When ligand binds to the complex, it induces a conformational change allowing the recruitment of coactivators, histone acetyltransferases, and the basic transcription machinery.[9]
Retinoic Acid Receptor Alpha, the protein, interacts with retinoic acid, a derivative of Vitamin A, which plays an important role in cell growth, differentiation, and the formation of organs in embryonic development.[8][10]
Once Retinoic Acid binds to the RAR, they initiate transcription and allow for their respective gene to be expressed. [10]
Clinical significance[]
RA signaling has been correlated with several signaling pathways in early embryonic development. First, it participates in the formation of the , which establishes symmetry in the offspring. RA also influences neural differentiation by regulating the expression of pro-neural induction factor Neurogenin 2 (Neurog2). RA affects cardiogenesis, as it plays a role specifically in the formation of the atrial chambers of the heart. RA also plays a role in the development of the pancreas, kidneys, lungs, and extremities. [10]
Translocations that always involve rearrangement of the RARA gene are a cardinal feature of acute promyelocytic leukemia (APL; MIM 612376). The most frequent translocation is t(15,17)(q21;q22), which fuses the RARA gene with the PML gene.[11]
Interactions[]
Retinoic acid receptor alpha has been shown to interact with:
Genetic Studies[]
Knock-out mice studies showed that a deletion in one of the copies of the RARA gene did not create any observable defect, while deletion of both copies shoes symptoms similar to that of Vitamin A deficiency. This proved that all 3 subtypes of RARs work redundantly.
See also[]
- Retinoic acid receptor
- Retinoic X Receptor
- Acute promyelocytic leukemia
References[]
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Further reading[]
- Petkovich M, Brand NJ, Krust A, Chambon P (1988). "A human retinoic acid receptor which belongs to the family of nuclear receptors". Nature. 330 (6147): 444–50. doi:10.1038/330444a0. PMID 2825025. S2CID 4271628.
- Sirulnik A, Melnick A, Zelent A, Licht JD (September 2003). "Molecular pathogenesis of acute promyelocytic leukaemia and APL variants". Best Practice & Research. Clinical Haematology. 16 (3): 387–408. doi:10.1016/S1521-6926(03)00062-8. PMID 12935958.
- Kliewer SA, Umesono K, Mangelsdorf DJ, Evans RM (January 1992). "Retinoid X receptor interacts with nuclear receptors in retinoic acid, thyroid hormone and vitamin D3 signalling". Nature. 355 (6359): 446–9. Bibcode:1992Natur.355..446K. doi:10.1038/355446a0. PMC 6159885. PMID 1310351.
- Kastner P, Perez A, Lutz Y, Rochette-Egly C, Gaub MP, Durand B, et al. (February 1992). "Structure, localization and transcriptional properties of two classes of retinoic acid receptor alpha fusion proteins in acute promyelocytic leukemia (APL): structural similarities with a new family of oncoproteins". The EMBO Journal. 11 (2): 629–42. doi:10.1002/j.1460-2075.1992.tb05095.x. PMC 556495. PMID 1311253.
- Baniahmad A, Köhne AC, Renkawitz R (March 1992). "A transferable silencing domain is present in the thyroid hormone receptor, in the v-erbA oncogene product and in the retinoic acid receptor". The EMBO Journal. 11 (3): 1015–23. doi:10.1002/j.1460-2075.1992.tb05140.x. PMC 556542. PMID 1347744.
- de Thé H, Lavau C, Marchio A, Chomienne C, Degos L, Dejean A (August 1991). "The PML-RAR alpha fusion mRNA generated by the t(15;17) translocation in acute promyelocytic leukemia encodes a functionally altered RAR". Cell. 66 (4): 675–84. doi:10.1016/0092-8674(91)90113-D. PMID 1652369. S2CID 40272758.
- de Thé H, Chomienne C, Lanotte M, Degos L, Dejean A (October 1990). "The t(15;17) translocation of acute promyelocytic leukaemia fuses the retinoic acid receptor alpha gene to a novel transcribed locus". Nature. 347 (6293): 558–61. Bibcode:1990Natur.347..558D. doi:10.1038/347558a0. PMID 2170850. S2CID 4314933.
- Brand NJ, Petkovich M, Chambon P (December 1990). "Characterization of a functional promoter for the human retinoic acid receptor-alpha (hRAR-alpha)". Nucleic Acids Research. 18 (23): 6799–806. doi:10.1093/nar/18.23.6799. PMC 332734. PMID 2175878.
- Borrow J, Goddard AD, Sheer D, Solomon E (September 1990). "Molecular analysis of acute promyelocytic leukemia breakpoint cluster region on chromosome 17". Science. 249 (4976): 1577–80. Bibcode:1990Sci...249.1577B. doi:10.1126/science.2218500. PMID 2218500.
- Arveiler B, Petkovich M, Mandel JL, Chambon P (July 1988). "A PstI RFLP for the human retinoic acid receptor in 17q21". Nucleic Acids Research. 16 (13): 6252. doi:10.1093/nar/16.13.6252. PMC 336887. PMID 2899875.
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- Chen Z, Guidez F, Rousselot P, Agadir A, Chen SJ, Wang ZY, et al. (February 1994). "PLZF-RAR alpha fusion proteins generated from the variant t(11;17)(q23;q21) translocation in acute promyelocytic leukemia inhibit ligand-dependent transactivation of wild-type retinoic acid receptors". Proceedings of the National Academy of Sciences of the United States of America. 91 (3): 1178–82. Bibcode:1994PNAS...91.1178C. doi:10.1073/pnas.91.3.1178. PMC 521477. PMID 8302850.
- Redner RL, Rush EA, Faas S, Rudert WA, Corey SJ (February 1996). "The t(5;17) variant of acute promyelocytic leukemia expresses a nucleophosmin-retinoic acid receptor fusion". Blood. 87 (3): 882–6. doi:10.1182/blood.V87.3.882.bloodjournal873882. PMID 8562957.
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This article incorporates text from the United States National Library of Medicine, which is in the public domain.
- Genes on human chromosome 17
- Intracellular receptors
- Transcription factors