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Updated: Jul 13, 2026

FISH for Pre-implantation Genetic Diagnosis
Published on: February 23, 2011
The origin of trisomy 22: evidence for acrocentric chromosome-specific patterns of nondisjunction
Heather E Hall1, Urvashi Surti, Lori Hoffner
1Center for Reproductive Biology and School of Molecular Biosciences, Washington State University, Pullman, Washington 99164-4660, USA.
Abstract:
Trisomy 22 is one of the most common trisomies in clinically recognized pregnancies, yet relatively little is known about the origin of nondisjunction for chromosome 22. Accordingly, we initiated studies to investigate the origin of the extra chromosome in 130 trisomy 22 cases. Our results indicate that the majority of trisomy 22 errors (>96%) arise during oogenesis with most of these errors ( approximately 90%) occurring during the first meiotic division. As with other trisomies, failure to recombine contributed to nondisjunction of chromosome 22. Taken together with data available for other trisomies, our results suggest patterns of nondisjunction that are shared among the acrocentric, but not all nonacrocentric, chromosomes.
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