Human chromosome-specific aneuploidy is influenced by DNA-dependent centromeric features

Area of Science:

• Genetics
• Cell Biology
• Genomics

Background:

• Centromeres are crucial for chromosome segregation fidelity.
• Centromeres contain specialized chromatin (CENP-A) and repetitive DNA, varying in length across human chromosomes.
• Chromosome-specific aneuploidy is linked to intrinsic genomic features.

Purpose of the Study:

• To investigate if centromere length heterogeneity influences centromeric DNA-dependent features.
• To determine if centromere length impacts chromosome-specific aneuploidy genesis.
• To explore the relationship between centromere features and chromosome segregation fidelity.

Main Methods:

• Genetic inactivation of CENP-A in human cells.
• Whole-genome sequencing and centromere mapping.
• Cytogenetic analysis, small molecule inhibitors, and genetic manipulation.

Main Results:

• Mis-segregation rates differ among chromosomes when centromere function is compromised.
• Inter-chromosomal heterogeneity of centromeric features, not length, affects chromosome segregation fidelity.
• Centromeres with higher abundance of DNA-dependent components favor faithful segregation.

Conclusions:

• Faithful chromosome segregation is biased by centromere composition.
• Inter-chromosomal differences in centromere features contribute to non-random aneuploidy.
• Non-random aneuploidy is a hallmark of cancer and genetic diseases.