X-inactive specific transcript (XIST) (XIST)

X-inactive specific transcript (XIST) is a pivotal long non-coding RNA (lncRNA) essential for X-chromosome inactivation (XCI) in female mammals, a process that ensures balanced gene dosage between sexes [NCBI Gene: 7503]. XIST functions by coating the X chromosome from which it is expressed and recruiting various epigenetic modifiers, such as Polycomb group proteins, to silence gene transcription through chromatin remodeling [PubMed: 24245513]. Beyond its fundamental role in development, XIST is increasingly recognized as a significant factor in human disease, particularly in oncology where it often functions as an oncogene across multiple cancer types, including breast and lung carcinomas [PubMed: 28814371]. It is also implicated in the pathogenesis of autoimmune disorders like systemic lupus erythematosus, where its dysregulation may contribute to the loss of immune tolerance [PubMed: 22307131]. Current therapeutic exploration focuses on using antisense oligonucleotides (ASOs) to degrade XIST transcripts or small molecules to disrupt its interaction with protein partners, offering a novel approach to treating XIST-dependent pathologies [PubMed: 31534203].

Other names

X-inactive-specific transcript (non-protein coding)LINC00001X inactive specific transcriptXIST-AS1

Degradation of lncRNA transcripts via RNase H-mediated cleavage or steric hindrance of RNA-protein interactions to restore or inhibit gene expression patterns [PubMed: 31534203].