The human Y and inactive X chromosomes similarly modulate autosomal gene expression

Cell Genom. 2024 Jan 10;4(1):100462. doi: 10.1016/j.xgen.2023.100462. Epub 2023 Dec 13.

Abstract

Somatic cells of human males and females have 45 chromosomes in common, including the "active" X chromosome. In males the 46th chromosome is a Y; in females it is an "inactive" X (Xi). Through linear modeling of autosomal gene expression in cells from individuals with zero to three Xi and zero to four Y chromosomes, we found that Xi and Y impact autosomal expression broadly and with remarkably similar effects. Studying sex chromosome structural anomalies, promoters of Xi- and Y-responsive genes, and CRISPR inhibition, we traced part of this shared effect to homologous transcription factors-ZFX and ZFY-encoded by Chr X and Y. This demonstrates sex-shared mechanisms by which Xi and Y modulate autosomal expression. Combined with earlier analyses of sex-linked gene expression, our studies show that 21% of all genes expressed in lymphoblastoid cells or fibroblasts change expression significantly in response to Xi or Y chromosomes.

Keywords: CRISPR; Klinefelter syndrome; Turner syndrome; X chromosome inactivation; aneuploidy; gene expression; sex chromosomes; sex differences; transcription factors.

MeSH terms

  • Chromosomes, Human, X / genetics
  • Female
  • Gene Expression / genetics
  • Humans
  • Male
  • Sex Chromosome Aberrations
  • Transcription Factors* / genetics
  • Y Chromosome*

Substances

  • Transcription Factors