Novel NDE1 homozygous mutation resulting in microhydranencephaly and not microlyssencephaly
Lissencephaly is characterized by deficient cortical lamination. Recently homozygous NDE1 mutations were reported in three kindred afflicted with extreme microcephaly with lissencephaly or microlissencephaly. Another severe developmental defect that involves the brain is microhydranencephaly which manifests with microcephaly, motor and mental retardation and brain malformations that include gross dilation of the ventricles with complete absence of the cerebral hemispheres or severe delay in their development. In the three related patients with microhydranencephaly that we had reported previously, we identified a homozygous deletion that encompasses NDE1 exon 2 containing the initiation codon. The mutation is predicted to result in a null allele. Herein we compare the clinical phenotypes of our research patients to those reported as microlissencephaly. The clinical findings in our patients having the fourth NDE1 mutation reported so far widen the spectrum of brain malformations resulting from mutations in NDE1.
KeywordsMicrohydranencephaly Microlissencephaly NDE1 MHAC
We thank the family for participating in the study. This work was supported by the Turkish Academy of Sciences.
All experiments comply with the laws of the Republic of Turkey, the country in which they were performed. The authors declare that they have no conflict of interests.
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