X inactive specific transcript (XIST)

X inactive specific transcript (XIST) is a large (~19 kb in humans) nuclear long non-coding RNA that orchestrates X chromosome inactivation in female mammals to achieve dosage compensation for X-linked genes[4][1][6]. Expressed from the future inactive X chromosome, XIST coats the chromosome in cis, recruiting chromatin-modifying complexes (such as Polycomb group proteins) and altering chromatin architecture, leading to progressive gene silencing and heterochromatin formation[5][6]. Beyond its classical role in XCI, XIST has emerged as a key epigenetic regulator in numerous biological processes and diseases, notably in different cancer types, inflammation, and other sex-biased or epigenetic pathologies, often functioning as a competing endogenous RNA that regulates key signaling molecules through interaction with microRNAs or RNA-binding proteins[1][2][4]. XIST is regarded as a promising candidate for both disease biomarker applications and as a novel therapeutic target, though clinical exploitation remains experimental[1][4][2].

Other names

NCRNA00001DXS1089swd66LINC00001long intergenic non-protein coding RNA 1DXS399ESXI1X inactive specific transcript (non-protein coding)XIST

Not applicable for approved drugs since XIST is not directly targeted clinically; experimental manipulation can inhibit XIST expression or activity for therapeutic effects in models[4].