Abstract
Contiguous microdeletions of the Norrie disease pseudoglioma (NDP) region on chromosome Xp11.3 have been widely confirmed as contributing to the typical clinical features of Norrie disease (ND). However, the precise relation between genotype and phenotype could vary. The contiguous deletion of NDP and its neighbouring genes, MAOA/B and EFHC2, reportedly leads to syndromic clinical features such as microcephaly, intellectual disability, and epilepsy. Here we report a novel contiguous microdeletion of the NDP region containing the MAOB and EFHC2 genes, which causes eye defects but no cognitive disability. We detected a deletion of 494.6 kb at Xp11.3 in both the proband and carrier mother. This deletion was then used as the molecular marker in prenatal diagnosis for two subsequent pregnancies. The deletion was absent in one of the foetuses, who remain without any abnormalities at 2 years of age. The proband shows the typical ocular clinical features of ND including bilateral retinal detachment, microphthalmia, atrophic irides, corneal opacification, and cataracts, but no symptoms of microcephaly, intellectual disability, and epilepsy. This familial study demonstrates that a deficiency in one of two MAO genes may not lead to psychomotor delay, and deletion of EFHC2 may not cause epilepsy. Our observations provide new information on the genotype–phenotype relations of \({\textit{MAOA/B}}\) and EFHC2 genes involved in the contiguous deletions of ND.
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Acknowledgements
We thank the family members who accepted to participate in this study. This work was supported by Science and Technology Programme of Guangdong Province (no. 2015B050501006), Chinese National Science Foundation (no. 81571097), The Ph.D. Start-up Fund of Natural Science Foundation of Guangdong Province (no. 2015A030310026), President Foundation of Nanfang Hospital, Southern Medical University (no. 2013C013, 2015Z004) and Academy Foundation of Nanfang Hospital, Southern Medical University (no. 2013018, 2013044).
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Bei Jia and Liping Huang contributed equally to this work.
Corresponding editor: S. Ganesh
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Jia, B., Huang, L., Chen, Y. et al. A novel contiguous deletion involving \(\varvec{NDP},\) MAOB and EFHC2 gene in a patient with familial Norrie disease: bilateral blindness and leucocoria without other deficits. J Genet 96, 1015–1020 (2017). https://doi.org/10.1007/s12041-017-0869-5
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DOI: https://doi.org/10.1007/s12041-017-0869-5