What the study found
The study found that a complex paracentric inversion on chromosome 6q, a type of chromosome rearrangement confined to one chromosome arm, can lead to viable recombinant chromosomes with unbalanced gains and losses. In this family, the rearrangement was transmitted across multiple generations and was associated with five affected children.
Why the authors say this matters
The authors conclude that these findings challenge the assumption that paracentric inversions rarely produce viable recombinant chromosomes. They also say the study underscores the importance of high-resolution genomic technologies for accurate diagnosis, understanding the molecular mechanism, and reproductive risk assessment in carriers of complex chromosomal rearrangements.
What the researchers tested
The researchers examined a familial intrachromosomal rearrangement involving chromosome 6q across multiple generations. They used high-resolution optical genome mapping, because conventional cytogenetic methods such as G-banded karyotype, FISH (fluorescence in situ hybridization), and chromosomal microarray were said to lack enough resolution to determine the structure.
What worked and what didn't
High-resolution optical genome mapping revealed a roughly 75 Mb balanced complex chromosomal rearrangement in the parent. The rearrangement appeared to consist of multiple sequential paracentric inversions and included a single roughly 13 Mb segment in the correct orientation; biased meiotic recombination within that segment was associated with recurrent unbalanced products in the children.
What to keep in mind
The abstract describes one family, so the findings are based on a specific familial case rather than a broad population study. The abstract does not provide additional limitations beyond the note that standard cytogenetic methods lacked sufficient resolution.
Key points
- A complex paracentric inversion on chromosome 6q was transmitted across multiple generations.
- Five children in the family had recombinant chromosomes with reciprocal interstitial gains and losses on 6q.
- Optical genome mapping identified a roughly 75 Mb balanced complex rearrangement made of multiple sequential inversions.
- A roughly 13 Mb correctly oriented segment was linked to biased meiotic recombination.
- The authors say the case challenges the idea that paracentric inversions rarely yield viable recombinant chromosomes.
Disclosure
- Research title:
- Complex chromosome 6 inversions produced viable recombinant offspring
- Authors:
- Melanie Babcock, Marwa Daghsni, Jessica Sebastian, Emily Lancaster, Lina Ghaloul‐Gonzalez, Damara Ortiz, Evan R. Powell, Daniel B. Bellissimo, T. Sahoo, Svetlana A. Yatsenko
- Institutions:
- BioNano Genomics (United States), Magee-Womens Hospital, Magee-Womens Hospital, Magee-Womens Hospital, Magee-Womens Hospital, Stanford University, University of Pittsburgh, University of Pittsburgh, University of Pittsburgh, University of Pittsburgh, University of Pittsburgh, University of Pittsburgh, University of Pittsburgh
- Publication date:
- 2026-03-08
- DOI:
- 10.1002/ajmg.a.70108
- OpenAlex record:
- View
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