RARA plays an important role in the establishment of the immune system by inducing T-regulatory cells, promoting tolerance, and controlling the differentiation of immature immune cells in the bone marrow called promyelocytes into mature white blood cells. The prevalence of this gene in the developing immune system leaves it subject to possible defects, the most common of which is a condition known as acute promyeloid leukemia (APL), caused by a somatic mutation described by the fusion of RARA and the PML gene located on chromosome 15. This fusion results in the formation of the protein complex PML-RARα. Under normal circumstances, PML produces a tumor suppressing protein that works by inhibiting uncontrolled rapid cell growth. When the two proteins fuse together, their normal functions are hindered, resulting in the accumulation of promyelocytes in the bone marrow unable to differentiate past this immature phase. This fusion makes up for the cause of 98% of APL cases, with some other rare mutations and fusions making up the other 2%.6 Current treatment approaches include all-trans-retinoic acid (ATRA) which works by targeting and degrading the PML-RARα protein complex, in addition to chemotherapy and platelet transfusions.
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 shows symptoms similar to that of vitamin A deficiency. This proved that all three subtypes of RARs work redundantly.
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