NR1B1 je gen sa proteinskim proizvodom i ima hromosomsku lokaciju 17q21.2. RARA kodira receptora jedarnog hormona, receptor retinojske kiseline, podtip alfa i sam je transkripcijski faktor. Postoje još dva podtipa RAR-a, beta i gama.[7][8]
Retinoidnu signalizaciju transduciraju članovi dvije porodice jedarnih receptora, receptor retinojske kiseline (RAR) i retinoidnui X-receptor (RXR), koji formiraju RXR/RAR heterodimere. U nedostatku liganda, DNK vezani RXR/RARA potiskuje transkripciju, regrutacijom korepresora NCOR1, SMRT (NCOR2), i histon-deacetilaze. Kada se ligand veže za kompleks, inducira konformacijsku promjenu koja omogućava regrutovanje koaktivatora, histon-acetiltransferaza i osnovnog transkripcijskog mehanizma.[9]
Kada se retinoična kiselina veže za RAR, oni pokreću transkripciju i omogućavaju ekspresiju njihovog gena.[10]
Klinički značaj
RA signalizacija je u korelacijama sa nekoliko signalnih puteva u ranom embrionskom razvoju. Prvo, učestvuje u formiranju embrionske osovine, koja uspostavlja simetriju u potomstvu. RA također utiče na nervnu diferencijaciju. regulacijom ekspresije proneurvnog indukcionog faktora meurogenina 2 (neurog2). RA utiče na kardiogenezu, jer ima posebnu ulogu u formiranju srčane pretkomore. RA također ima ulogu u razvoju pankreasa, bubrega, pluća i ekstremiteta.[10]
Translokacije koje uvijek uključuju preuređivanje gena RARA su kardinalna karakteristika akutne promijelocitne leukemije (APL; MIM 612376). Najčešća translokacija je t(15,17)(q21;q22), koja spaja gen RARA sa genom PML.[11]
Interakcije
Pokazalo se da receptor alfa retinojske kiseline reaguje sa:
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.
^Anderson LA, Friedman L, Osborne-Lawrence S, Lynch E, Weissenbach J, Bowcock A, King MC (septembar 1993). "High-density genetic map of the BRCA1 region of chromosome 17q12-q21". Genomics. 17 (3): 618–23. doi:10.1006/geno.1993.1381. PMID8244378.
^Vitoux D, Nasr R, de The H (2007). "Acute promyelocytic leukemia: new issues on pathogenesis and treatment response". The International Journal of Biochemistry & Cell Biology. 39 (6): 1063–70. doi:10.1016/j.biocel.2007.01.028. PMID17468032.
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. PMID2825025. S2CID4271628.
Sirulnik A, Melnick A, Zelent A, Licht JD (septembar 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. PMID12935958.
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. PMID1652369. S2CID40272758.
de Thé H, Chomienne C, Lanotte M, Degos L, Dejean A (oktobar 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. PMID2170850. S2CID4314933.
Liu W, Hellman P, Li Q, Yu WR, Juhlin C, Nordlinder H, et al. (decembar 1996). "Biosynthesis and function of all-trans- and 9-cis-retinoic acid in parathyroid cells". Biochemical and Biophysical Research Communications. 229 (3): 922–9. doi:10.1006/bbrc.1996.1903. PMID9005841.
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