Phenotypic and genotypic characteristics of fever?induced paroxysmal weakness and encephalopathy caused by ATP1A3 pathogenic variants
10.3760/cma.j.issn.0578‐1310.2019.07.010
- VernacularTitle:ATP1A3基因变异相关发热诱导阵发性无力及脑病表型和基因型特征研究
- Author:
Weihua ZHANG
1
;
Xiaotun REN
;
Weixing FENG
;
Chunhong CHEN
;
Changhong DING
;
Junlan LYU
;
Tongli HAN
Author Information
1. 首都医科大学附属北京儿童医院神经内科100045
- Keywords:
Sodium‐Potassium‐exchanging ATPase;
Fever;
Encephalopathy;
Genes,ATP1A3
- From:
Chinese Journal of Pediatrics
2019;57(7):543-547
- CountryChina
- Language:Chinese
-
Abstract:
Objective To characterize fever‐induced paroxysmal weakness and encephalopathy (FIPWE) caused by ATP1A3 gene pathogenic variant. Methods Phenotypic and genotypic characteristics of 4 FIPWE patients(3 boys and 1 girl), who were ascertained from October 2016 to March 2018 in Beijing Children′s Hospital due to ATP1A3 heterozygous variants, were retrospectively analyzed. The whole exsome sequencing was used for genetic testing. Results The onset ages of 4 patients were 2 years and 9 months, 2 years and 4 months, 8 months, 2 years and 5 months respectively. The episode ranged from 1 to 3 times, and at 3 months to 2 years and 10 months intervals. All 4 patients had symptoms of limb weakness and encephalopathy, accompanied with mild to severe ataxia or athetosis. The tendon reflex was absent in all patients, and the Babinski′s sign was positive. Three patients had dysphagia and 3 patients had slurred speech. Three patients had abnormal eye movements, including strabismus and opsoclonus. None of the 4 patients exhibited visual impairment, auditory impairment or talipes cavus. The duration of acute phase ranged from 1 week to 3 months. In 3 relapsing patients, symptoms became progressively worse, with relapses occurring frequently and recovery being more difficult, and various sequelae were found after the last relapse. All patients carried heterozygous variant in ATP1A3 gene. The missense variants result in the substitution of an arginine residue at position 756. Three variants were identified, including C. 2267G>T (p. R756L) (1 case), C. 2266C>T (p. R756C) (2 cases), and C. 2267G>A (p. R756H) (1 case). Three were de novo and one inherited from his father, but the grandparents did not carry the variant. All variants were reported as pathogenic. Conclusions FIPWE is one of new clinical phenotypes of ATP1A3 spectrum disease and most cases are sporadic. The missense variants result in the substitution of an arginine residue at position 756. This report provided insights into the phenotype‐genotype association in patients with FIPWE caused by pathogenic variants of ATP1A3.
