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Autosomal Allelic Inactivation: Variable Replication and Dosage Sensitivity.

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Summary
This summary is machine-generated.

New autosomal loci, called Inactivation/Stability Centers (I/SCs), show stable, allele-specific gene expression and replication timing, creating cellular mosaicism impacting human diseases.

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Area of Science:

  • Genetics
  • Epigenetics
  • Genomic Regulation

Background:

  • Autosomal genes exhibit monoallelic expression and asynchronous replication, similar to imprinted genes and those regulated by allelic exclusion.
  • Inactivation/Stability Centers (I/SCs) are autosomal loci with epigenetic regulation of allelic expression and replication timing.
  • These epigenetic differences can be as significant as those between active and inactive X chromosomes.

Purpose of the Study:

  • To characterize hundreds of autosomal loci exhibiting allele-specific epigenetic regulation of replication timing and gene expression.
  • To define these loci as Inactivation/Stability Centers (I/SCs).
  • To investigate the characteristics and implications of I/SCs.

Main Methods:

  • Characterization of hundreds of autosomal loci.
  • Analysis of allele-specific epigenetic regulation of replication timing and gene expression.
  • Comparative analysis with mouse genomes to identify conserved synteny.

Main Results:

  • Identified and defined hundreds of I/SCs, approximately 1 megabase in size, containing protein-coding and noncoding genes.
  • Observed stochastic yet mitotically stable allele-specific gene expression patterns, independent of parent of origin or other alleles.
  • Found allele-specific replication timing variations, independent of the other allele, and conserved I/SCs in mouse genomes.

Conclusions:

  • I/SCs demonstrate allele-restricted regulation, leading to extensive cellular mosaicism via stable epigenetic mechanisms.
  • This mosaicism affects numerous dosage-sensitive genes implicated in diseases like Parkinson's, epilepsy, deafness, and intellectual disabilities.