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PIGT-CDG, a disorder of the glycosylphosphatidylinositol anchor: description of 13 novel patients and expansion of the clinical characteristics

Bayat, A; Knaus, A; Juul, AW; Dukic, D; Gardella, E; Charzewska, A; Clement, E; ... DDD Study Group, .; + view all (2019) PIGT-CDG, a disorder of the glycosylphosphatidylinositol anchor: description of 13 novel patients and expansion of the clinical characteristics. Genetics in Medicine 10.1038/s41436-019-0512-3. (In press). Green open access

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Bayat_PIGT manuscript.pdf - Accepted version

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PIGT Table 1 - Clinical Table (1).pdf - Accepted version

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Bayat_Supplementary S-1.pdf - Accepted version

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Supplementary S-2.pdf - Accepted version

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Figure 1 - Pedigree.pdf - Published version

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Figure 2 - Faces_final.pdf - Published version

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Figure 3 - A and B.pdf - Published version

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Figure_4 - MRI.pdf - Published version

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Figure_S1_patient1.pdf - Published version

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Figure_S2_patien2.pdf - Published version

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Abstract

PURPOSE: To provide a detailed electroclinical description and expand the phenotype of PIGT-CDG, to perform genotype-phenotype correlation, and to investigate the onset and severity of the epilepsy associated with the different genetic subtypes of this rare disorder. Furthermore, to use computer-assisted facial gestalt analysis in PIGT-CDG and to the compare findings with other glycosylphosphatidylinositol (GPI) anchor deficiencies. // METHODS: We evaluated 13 children from eight unrelated families with homozygous or compound heterozygous pathogenic variants in PIGT. // RESULTS: All patients had hypotonia, severe developmental delay, and epilepsy. Epilepsy onset ranged from first day of life to two years of age. Severity of the seizure disorder varied from treatable seizures to severe neonatal onset epileptic encephalopathies. The facial gestalt of patients resembled that of previously published PIGT patients as they were closest to the center of the PIGT cluster in the clinical face phenotype space and were distinguishable from other gene-specific phenotypes. // CONCLUSION: We expand our knowledge of PIGT. Our cases reaffirm that the use of genetic testing is essential for diagnosis in this group of disorders. Finally, we show that computer-assisted facial gestalt analysis accurately assigned PIGT cases to the multiple congenital anomalies-hypotonia-seizures syndrome phenotypic series advocating the additional use of next-generation phenotyping technology.

Type: Article
Title: PIGT-CDG, a disorder of the glycosylphosphatidylinositol anchor: description of 13 novel patients and expansion of the clinical characteristics
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/s41436-019-0512-3
Publisher version: https://doi.org/10.1038/s41436-019-0512-3
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: PIGT-CDG, computer-assisted facial gestalt analysis, congenital disorder of glycosylation, epilepsy, genotype–phenotype
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Neurodegenerative Diseases
URI: https://discovery.ucl.ac.uk/id/eprint/10077558
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