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A germline chromothripsis event stably segregating in 11 individuals through three generations

Item Type:Article
Title:A germline chromothripsis event stably segregating in 11 individuals through three generations
Creators Name:Bertelsen, B. and Nazaryan-Petersen, L. and Sun, W. and Mehrjouy, M.M. and Xie, G. and Chen, W. and Hjermind, L.E. and Taschner, P.E.M. and Tuemer, Z.
Abstract:Purpose: Parentally transmitted germ-line chromothripsis (G-CTH) has been identified in only a few cases. Most of these rearrangements were stably transmitted, in an unbalanced form, from a healthy mother to her child with congenital abnormalities probably caused by de novo copy-number changes of dosage sensitive genes. We describe a G-CTH transmitted through three generations in 11 healthy carriers. Methods: Conventional cytogenetic analysis, mate-pair sequencing, and polymerase chain reaction (PCR) were used to identify the chromosome rearrangement and characterize the breakpoints in all three generations. Results: We identified an apparently balanced translocation t(3;5), later shown to be a G-CTH, in all individuals of a three-generation family. The G-CTH stably segregated without occurrence of additional rearrangements; however, several spontaneous abortions were reported, possibly due to unbalanced transmission. Although seven protein-coding genes are interrupted, no clinical features can be definitively attributed to the affected genes. However, it can be speculated that truncation of one of these genes, encoding ataxia-telangiectasia and Rad3-related protein kinase (ATR), a key component of the DNA damage response, may be related to G-CTH formation. Conclusion: G-CTH rearrangements are not always associated with abnormal phenotypes and may be misinterpreted as balanced two-way translocations, suggesting that G-CTH is an underdiagnosed phenomenon.
Keywords:Ataxia-Telangiectasia and Rad3-Related Protein Kinase, Chromothripsis, Nomenclature, Single Event, Stable Segregation
Source:Genetics in Medicine
Publisher:Nature Publishing Group
Page Range:494-500
Date:May 2016
Official Publication:https://doi.org/10.1038/gim.2015.112
PubMed:View item in PubMed

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