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8th World Congress on Epigenetics and Chromosome

Zurich, Switzerland

Irene Cantone

Irene Cantone

University of Naples Federico II, Italy

Title: Understanding epigenetic reprogramming by X chromosome reactivation

Biography

Biography: Irene Cantone

Abstract

Erasure of epigenetic memory is required to convert somatic cells towards pluripotency.
Reactivation of the inactive X chromosome (Xi) has been used to model epigenetic reprogramming in
mouse, but human studies are hampered by Xi epigenetic instability and difficulties in tracking partially
reprogrammed iPSCs. Recently, I have established a cell fusion reprogramming system that recapitulates
features of human naïve pluripotency and enables tracing early chromatin changes. This system revealed
that loss of XIST and H3K27me3 from the human Xi precedes and is required for Xi transcriptional reactivation
ahead of cell division (Cantone et al., Nature Comm 2016). Interestingly, single-cell RNA-FISH and allelespecific
RNA sequencing analyses revealed that reprogramming-mediated human Xi reactivation was partial
and selective for a specific subset of genes. Selective Xi reactivation was not limited to gene loci residing
within specific chromatin domains (e.g. H3K27me3 or H3K9me3 domains) neither influenced by proximity
to XIST locus.
Reactivation was instead associated with stochastic Xi expression ahead of reprogramming, as shown by
single cells and isogenic fibroblast clones (Cantone et al., Genome Biology 2017). Notably, stochastic Xi
transcription is stabilized in some clonal lineages suggesting that single-cell transcriptional variability might
underlie heritable gene reactivation even in heterochromatic contexts. Implications for targeted Xi gene
reactivation during human pluripotent reprogramming and in somatic cells will be discussed as a concept
for modelling and therapy of human X-linked diseases