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As genome wide techniques become more common, an increasing proportion of patients with intellectual disability (ID) are found to have genetic defects allowing genotype-phenotype correlations. Previously, AKT3 deletion was suggested to be responsible for microcephaly in patients with 1q43-q44 deletion syndrome, but this does not correspond to all cases. We report a case of a de novo 1q44 deletion in an 8-year-old boy with microcephaly in whom AKT3 is not deleted. We used a systematic review of the literature, our patient, and network analysis to gain a better understanding of the genetic basis of microcephaly in 1q deletion patients. Our analysis showed that while AKT3 deletion is associated with more severe (≤3 SD) microcephaly in 1q43-q44 deletion patients, other genes may contribute to microcephaly in AKT3 intact patients with microcephaly and 1q43-44 deletion syndrome. We identified a potential role for HNRNPU, SMYD3, NLRP3, and KIF26B in microcephaly. Overall, our study highlights the need for network analysis and quantitative measures reporting in the phenotypic analysis of a complex genetic syndrome related to copy number variation. © 2017 Wiley Periodicals, Inc.

Citation

Nicholas Raun, Janette Mailo, Egidio Spinelli, Xu He, Sarah McAvena, Logan Brand, Julia O'Sullivan, John Andersen, Lawrence Richer, Richard Tang-Wai, Francois V Bolduc. Quantitative phenotypic and network analysis of 1q44 microdeletion for microcephaly. American journal of medical genetics. Part A. 2017 Apr;173(4):972-977

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PMID: 28328126

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