X-chromosome inactivation equalizes the dosage of X-linked genes in XX females with that in XY males. Recent findings reveal that the BRCA1 breast cancer susceptibility gene has an important function in this epigenetic phenomenon.
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An X-tra role for NFκB in gene regulation?
Immunol Cell Biol
January 2025
The Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, Australia.
In this Research Highlight, we discuss recent research which shows that TCR-mediated activation and NF-κB signalling play an indispensable role in localising Xist RNA and its interactors to the inactive X chromosome (Xi) in T cells (left and middle). Inhibition of NF-κB disrupts this process, impairing the recruitment of silencing factors and jeopardizing the maintenance of X chromosome inactivation (right).
View Article and Find Full Text PDFClinical management of female patients with Fabry disease based on expert consensus.
Orphanet J Rare Dis
January 2025
Department of Nephrology and Endocrinology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark.
Fabry disease is an X-linked lysosomal storage disorder that causes accumulation of glycosphingolipids in body tissues and fluids, leading to progressive organ damage and life-threatening complications. It can affect both males and females and can be classified into classic or later-onset phenotypes. The disease severity in females ranges from asymptomatic to the more severe, classic phenotype.
View Article and Find Full Text PDFIn mammals, X-linked dosage compensation involves two processes: X-chromosome inactivation (XCI) to balance X chromosome dosage between males and females, and hyperactivation of the remaining X chromosome (Xa-hyperactivation) to achieve X-autosome balance in both sexes. Studies of both processes have largely focused on coding genes and have not accounted for transposable elements (TEs) which comprise 50% of the X-chromosome, despite TEs being suspected to have numerous epigenetic functions. This oversight is due in part to the technical challenge of capturing repeat RNAs, bioinformatically aligning them, and determining allelic origin.
View Article and Find Full Text PDFKDM6A facilitates Xist upregulation at the onset of X inactivation.
Biol Sex Differ
January 2025
Department of Laboratory Medicine and Pathology, School of Medicine, University of Washington, Seattle, WA, 98195, USA.
Background: X chromosome inactivation (XCI) is a female-specific process in which one X chromosome is silenced to balance X-linked gene expression between the sexes. XCI is initiated in early development by upregulation of the lncRNA Xist on the future inactive X (Xi). A subset of X-linked genes escape silencing and thus have higher expression in females, suggesting female-specific functions.
View Article and Find Full Text PDFEscape of Kdm6a from X Chromosome Is Detrimental to Ischemic Brains via IRF5 Signaling.
Transl Stroke Res
January 2025
Department of Neurology, McGovern Medical School, The University of Texas Health Science Center at Houston, 6431 Fannin Street, Houston, TX, 77030, USA.
The role of chromatin biology and epigenetics in disease progression is gaining increasing recognition. Genes that escape X chromosome inactivation (XCI) can impact neuroinflammation through epigenetic mechanisms. Our previous study has suggested that the X escapee genes Kdm6a and Kdm5c are involved in microglial activation after stroke in aged mice.
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