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Abdel-Salam, G. M. H., M. S. Abdel-Hamid, S. N. Saleem, M. K. H. Ahmed, M. Issa, L. K. Effat, H. F. Kayed, M. S. Zaki, and K. R. Gaber, "Profound microcephaly, primordial dwarfism with developmental brain malformations: A new syndrome", American Journal of Medical Genetics Part A: Wiley Subscription Services, Inc., A Wiley Company, 2012. Abstract
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Abdel-Salam, G. M. H., M. S. Zaki, S. N. Saleem, and K. R. Gaber, "Microcephaly, malformation of brain development and intracranial calcification in sibs: Pseudo-TORCH or a new syndrome", American Journal of Medical Genetics Part A, vol. 146, no. 22: Wiley Online Library, pp. 2929–2936, 2008. Abstract
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Abdel-Salam, G. M. H., H. H. Afifi, S. N. Saleem, M. I. Gadelhak, M. A. El-Serafy, I. S. M. Sayed, and M. S. Abdel-Hamid, "Further Evidence of a Continuum in the Clinical Spectrum of Dominant -Related Disorders and Implications in Cerebellar Anomalies.", Molecular syndromology, vol. 13, issue 5, pp. 389-396, 2022. Abstract

INTRODUCTION: Pathogenic variants in the PIEZO family member 2 () gene are known to cause Gordon syndrome (GS), Marden-Walker syndrome (MWS), and distal arthrogryposis type 5 (DA5). Out of these, MWS has a recognizable phenotype that can be discerned easily, but the distinction between GS and DA5 is less evident. Few children with pathogenic variants have been reported to show posterior fossa anomalies.

METHODS AND RESULTS: By candidate gene targeting guided by proper clinical evaluation and neuroimaging findings, a patient with classic MWS harboring a de novo novel variant (c.8237G>A, p.W2746*) in the C-terminal region of PIEZO2 was identified. In addition, another girl with the typical clinical features of GS is also described carrying the most prevalent reported variant (c.8057G>A, p.R2686H) in . The brain MRI of the 2 patients showed Dandy-Walker malformation (DWM). Diffusion tensor imaging visualized anteroposterior and downward aligned thin middle cerebellar peduncle. The association of DWM with arthrogryposis in the presence of variants remains quite interesting and provides more evidence that PIEZO2 plays a role in the development of hindbrain although the underlying mechanism remains unclear. Moreover, the 2 girls had distinct foot patterning in the form of shortening of the first and fifth toes.

CONCLUSION: Phenotype analysis and a comprehensive review of the literature strongly support the previously published data and corroborate the evidence that heterozygous related disorders represent a continuum with overlapping phenotypic features.

Abdel‐Salam, G. M. H., M. S. Abdel‐Hamid, H. A. El‐Khayat, O. M. Eid, S. Saba, M. K. Farag, S. N. Saleem, and K. Gaber, "Fetal brain disruption sequence versus fetal brain arrest: A distinct autosomal recessive developmental brain malformation phenotype", American Journal of Medical Genetics Part A, vol. 167, issue 5, pp. 1089-1099, 2015.
Aglan, M. S., A. K. Abdel-Aleem, A. I. S. EL-Katoury, M. H. Hafez, S. N. Saleem, G. A. Otaify, and S. A. Temtamy, "Clinical, anthropometric, radiological and molecular characteristics of Egyptian achondroplasia patients", Egyptian Journal of Medical Human Genetics, vol. 10, no. 1, 2009. Abstract
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Aglan, M. S., A. K. Abdel-Aleem, A. I. S. EL-Katoury, M. H. Hafez, S. N. Saleem, G. A. Otaify, and S. A. Temtamy, "Clinical, anthropometric, radiological and molecular characteristics of Egyptian achondroplasia patients", Egyptian Journal of Medical Human Genetics, vol. 10, no. 1, 2009. Abstract
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