What chromosome is Xist on?
Xist (X-inactive specific transcript) is a non-coding RNA on the X chromosome of the placental mammals that acts as a major effector of the X-inactivation process.
What is Xist chromosome therapy?
XIST is a long non-coding RNA that functions in cis to silence one X chromosome to dosage compensate X-linked genes between females (XX) and males (XY).
Where is the Xist RNA translated?
Xist RNA, required for X chromosome inactivation, is transcribed from the future inactivated X chromosome (Xi), where it spreads in cis, to initiate silencing.
What is the product of Xist?
The product of the mouse Xist gene is a 15 kb inactive X-specific transcript containing no conserved ORF and located in the nucleus. Cell. 1992 Oct 30;71(3):515-26. doi: 10.1016/0092-8674(92)90519-i.
Can you remove an extra chromosome?
WASHINGTON (US) — Scientists have successfully removed the extra copy of chromosome 21 in cell cultures derived from a person with Down syndrome. The cells of people with the condition contain three copies of chromosome 21 rather than the usual pair.
Is Xist RNA cis acting?
Xist lies within the X-inactivation center (Xic), a region on the X that is required for XCI, and is regulated in cis by elements on the X chromosome and in trans by diffusible factors.
What is the name of the other transcript that Xist counteracts?
A recently discovered lncRNA called XACT (X active coating transcript) that is unique to human PSCs, but does not reside in the XIC, may aid in maintaining transcriptional activity of the X chromosome from which it is expressed by counteracting XIST [20,28].
What is the human XIST gene?
The human XIST gene: analysis of a 17 kb inactive X-specific RNA that contains conserved repeats and is highly localized within the nucleus X chromosome inactivation in mammalian females results in the cis-limited transcriptional inactivity of most of the genes on one X chromosome.
What is the structure of the Xist RNA gene?
The Xist RNA gene consists of an A region, which contains 8 repeats separated by U-rich spacers. The A region appears to contain two long stem-loop structures that each include four repeats.
How does duplication of the Xist gene cause chromosome inactivation?
The inactive X chromosome is coated with this transcript, which is essential for the inactivation. X chromosomes lacking Xist will not be inactivated, while duplication of the Xist gene on another chromosome causes inactivation of that chromosome.
Can miRNAs mediate the Xist target gene axis in lung adenocarcinomas?
Study used a biology-driven approach to identify genes defended from miRNA-based inhibition by the lncRNA XIST in lung adenocarcinomas. Only a small subset of miRNAs predicted by sequence homology alone have the capacity to mediate the XIST-target gene axis, as they are enriched in the nucleus and able to co-localize with XIST for sponging.
