PLOS Genetics paper proposes unified model of aneuploid karyotype dynamics

A study published in PLOS Genetics on 18 June 2026, authored by Mathieu Hénault, Lisa M. Wood, and Lydia R. Heasley, proposes a unified model to describe the population-level dynamics of aneuploid karyotypes — states in which cells carry abnormal numbers of whole chromosomes.

Aneuploidy arises from nondisjunction errors during cell division and underlies a wide range of congenital conditions as well as somatic disorders including many cancers. Unlike most disease-causing genetic variants, aneuploidies can revert to a normal chromosome complement through subsequent nondisjunction events of the same type, introducing a plasticity that complicates predictions about disease incidence, penetrance, and progression.

The authors argue that prior models have treated aneuploidy dynamics in a fragmented way that fails to account for this inherent reversibility. Their unified framework integrates rates of gain and loss for individual chromosomes, allowing more systematic assessment of how stable a given aneuploid state is likely to be across a population or tissue. The paper is relevant to researchers in cancer genomics, developmental genetics, and reproductive medicine, and offers conceptual grounding for educators teaching chromosome biology and the genetics of cell division errors. The study was published in the open-access journal PLOS Genetics.