Novel ERLIN2 variant expands the phenotype of Spastic Paraplegia 18.

Autor: de Souza GC; Medical Genetics Sector, Faculty of Medicine, Federal University of Alagoas, Maceió, Alagoas, Brazil., Malta MC; Medical Genetics Sector, Faculty of Medicine, Federal University of Alagoas, Maceió, Alagoas, Brazil., Santos MRS; Medical Genetics Sector, Faculty of Medicine, Federal University of Alagoas, Maceió, Alagoas, Brazil., Fontes MÍB; Clinical Genetics Service, Medical Genetics Sector, Faculty of Medicine, University Hospital, Federal University of Alagoas, Maceió, Alagoas, Brazil.; Center of Health Sciences, Alagoas State University of Health Sciences-UNCISAL, Maceió, Alagoas, Brazil., de Sousa Anjos JL; Ophthalmology Sector, Faculty of Medicine, University Hospital, Federal University of Alagoas, Maceió, Alagoas, Brazil., Ribeiro DP; Ophthalmology Sector, Faculty of Medicine, University Hospital, Federal University of Alagoas, Maceió, Alagoas, Brazil., Kok F; Child Neurology Service, Department of Neurology, University of São Paulo School of Medicine, São Paulo, SP, Brazil.; Mendelics Genomic Analysis, São Paulo, SP, Brazil., Figueiredo T; Medical Genetics Sector, Faculty of Medicine, Federal University of Alagoas, Maceió, Alagoas, Brazil. thalita.figueiredo@famed.ufal.br.
Jazyk: angličtina
Zdroj: Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology [Neurol Sci] 2024 Jun; Vol. 45 (6), pp. 2705-2710. Date of Electronic Publication: 2023 Dec 30.
DOI: 10.1007/s10072-023-07271-0
Abstrakt: Background: The Brazilian Northeast region is notable for its high prevalence of consanguineous marriages and isolated populations, which has led to a significant prevalence of rare genetic disorders. This study describes the clinical presentation of four affected individuals from the same family, comprising two siblings and their cousins, with ages ranging from 11 to 20 years.
Methods: In a small and isolated community in Northeastern Brazil, affected individuals initially underwent a clinical assessment. Subsequently, written consent was obtained from their legal guardians, and an extensive clinical evaluation was conducted at a medical genetics center. Family data provided the basis for constructing the pedigree, and biological samples (blood or oral swabs) were collected from both affected and unaffected family members. Following informed consent from one patient, Whole Exome Sequencing (WES) was carried out, encompassing exome sequencing, assembly, genotyping, and annotation. A potentially deleterious variant was then singled out for further segregation analysis through Sanger Sequencing, involving both the proband and select family members.
Results and Conclusion: These individuals exhibit severe neurodevelopmental delays, encompassing symptoms such as spastic paraplegia, neuropathy, intellectual impairments, and language challenges. Through next-generation sequencing (NGS) techniques, a previously unreported homozygous variant within the ERLIN2 gene linked to spastic paraplegia 18 (SPG18) was identified across all four patients. Also, all patients displayed childhood cataract, expanding the known clinical spectrum of SPG18.
(© 2023. Fondazione Società Italiana di Neurologia.)
Databáze: MEDLINE
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