Abstract
We describe a female subject (DGAP100) with a 46,X,t(X;5)(p11.3;q35.3)inv(5)(q35.3q35.1)dn, severe psychomotor retardation with hypotonia, global postnatal growth restriction, microcephaly, globally reduced cerebral volume, seizures, facial dysmorphia and cleft palate. Fluorescence in situ hybridization and whole-genome sequencing demonstrated that the X chromosome breakpoint disrupts KDM6A in the second intron. No genes were directly disrupted on chromosome 5. KDM6A is a histone 3 lysine 27 demethylase and a histone 3 lysine 4 methyltransferase. Expression of KDM6A is significantly reduced in DGAP100 lymphoblastoid cells compared to control samples. We identified nine additional cases with neurodevelopmental delay and various other features consistent with the DGAP100 phenotype with copy number variation encompassing KDM6A from microarray databases. We evaluated haploinsufficiency of kdm6a in a zebrafish model. kdm6a is expressed in the pharyngeal arches and ethmoid plate of the developing zebrafish, while a kdm6a morpholino knockdown exhibited craniofacial defects. We conclude KDM6A dosage regulation is associated with severe and diverse structural defects and developmental abnormalities.
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We would like to thank DGAP100 and her family for participating in our research study and all of the healthcare professionals that contributed to this effort. We would also like to thank Mary Anne Anderson for her technical assistance at the Massachusetts General Hospital Genomics Core Facility in the Center for Human Genetic Research, Tammy Gillis and the MGH NextGen Sequencing Core, and the Cytogenetics Core of Dana Farber Harvard Cancer Center (P30 CA006516). This work was supported by PO1GM061354 (CCM), HD065286 (JFG) and MH095867 (MET) from the National Institutes of Health and the National Institute of General Medical Sciences, and March of Dimes and Shriners Hospitals for Children (ECL).
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Lindgren, A.M., Hoyos, T., Talkowski, M.E. et al. Haploinsufficiency of KDM6A is associated with severe psychomotor retardation, global growth restriction, seizures and cleft palate. Hum Genet 132, 537–552 (2013). https://doi.org/10.1007/s00439-013-1263-x
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DOI: https://doi.org/10.1007/s00439-013-1263-x