Study of a case of Juvenile neuronal ceroid lipofuscinosis due to compound heterozygous variants of PPT1 gene
10.3760/cma.j.cn511374-20240927-00510
- VernacularTitle:PPT1基因复合杂合变异致青少年型神经元蜡样脂褐质沉积症1例患儿的研究
- Author:
Dan ZHANG
1
;
Fang XU
1
;
Yi BAO
1
;
Yanming XU
1
Author Information
1. 四川大学华西医院神经内科，成都 610041
- Publication Type:Journal Article
- Keywords:
Neuronal ceroid lipofusein;
PPT1 gene;
Juvenile;
Compound heterozygous variants
- From:
Chinese Journal of Medical Genetics
2024;41(12):1469-1472
- CountryChina
- Language:Chinese
-
Abstract:
objective:To report and analyze a case of Juvenile neuronal ceroid lipofuscinosis (NCL) due to compound heterozygous variants of PPT1 gene. Methods:A child who was admitted to the Department of Neurology of West China Hospital of Sichuan University in April 2021 due to " intellectual decline and behavioral abnormalities for more than 5 years and movement disorder for more than 1 year" was selected as the study subject. Clinical data of the child was collected. Trio-whole exome sequencing was carried out for the child and his parents, and clinical follow-up was conducted. This study has been approved by the Medical Ethics Committee of West China Hospital of Sichuan University (Ethic No. 2024-2286).Results:The patient, a 13-year-old male, showed progressive mental decline, behavioral abnormalities, and movement disorders from the age of 8. Electroencephalogram showed abnormal background activities, and magnetic resonance imaging showed brain atrophy. Trio-whole exome sequencing revealed that he had harbored a paternally derived heterozygous c. 272(exon3)A>C variant and a maternally derived heterozygous c. 176(exon2)A>G variant of the PPT1 gene. His presentation was in keeping with previously reported juvenile NCL due to variants of the PPT1 gene. Conclusion:The c. 272(exon3)A>C and c. 176(exon2)A>G compound heterozygous variants of the PPT1 gene probably underlay the Juvenile NCL in this child. Discovery of the c. 176(exon2)A>G variant has expanded the mutational spectrum of this disease.
