ABSTRACT
Objective To analyze the clinical data and TUBB4A mutation of hypomyelination with atrophy of the basal ganglia and cerebellum (HABC)in a family,thus to provide accurate genetic counseling and prenatal diagno-sis for this family with HABC,and also to provide clinical experience for the diagnosis of HABC in China.Methods The clinical data of the proband and her family members were collected at the Department of Pediatrics,Peking Univer-sity First Hospital,December 201 4,including medical history,physical signs,and brain MRI,biochemical tests and metabolic disease screening.The associated gene of hereditary leukoencephalopathy was screened for the proband and her family members were screened by targeting -high -throughput sequencing technology,and then the genetic varia-tions were verified by Sanger sequencing.With those detection methods,the gene mutation was confirmed,and then ge-netic features were analyzed.Results Clinical features were as follows:nystagmus as the first symptom,and motor and mental retardation,dystonia and ataxia followed.Brain MRI indicated hypomyelination of white matter and atrophy of the basal ganglia and cerebellum.The clinical diagnosis of HABC was established based on the clinical features and brain MRI features above.Genetics features showed that one novel TUBB4A c.974G >T heterozygous missense muta-tion was found from the proband,which caused an amino acid change from the Trp into Leu (p.Trp325Leu).Both of her parents with normal phenotype were of wild -type in this site.Conclusions The proband from this family was diagnosed clinically based on her clinical data.One novel TUBB4Ac.974G > T (p.Trp325Leu)was founded in this study.Therefore,the spectrum of TUBB4A mutation will be expanded.In addition,this study elucidated clinical and genetic characteristics in this family with HABC,which may lay a solid foundation for the accurate genetic counseling and prenatal diagnosis.This study reported the first case of HABC caused by TUBB4A mutation in China.
ABSTRACT
Childhood ataxia with diffuse central nervous system hypomyelination(CACH) syndrome is a recently described leukodystrophy of unknown etiology. The patients show normal development until the age from 1.5 to 5 years, and sudden deterioration of all motor abilities with irritability is presented after a viral infection or minor head trauma. Brain magnetic resonance imaging(MRI) shows generalized hypointensity of the white matter in T1-weighted image, which turns hyperintense in T2-weighted image, and Proton Magnetic Resonance Spectroscopic Imaging(1H-MRSI) shows reduced signal of N- acetylaspartate, choline, and creatine only in white matter. Dementia is not present and peripheral nerves are normal. We report a case of CACH syndrome who was born with no perinatal problem, and showed normal development until the age of 16 months. She suddenly lost all motor abilities after exanthem subitum who recovered fully over two months. At the age of 18 months she experienced similar attack after chicken pox, and developed seizures at age of 18 months.
Subject(s)
Humans , Ataxia , Brain , Central Nervous System , Chickenpox , Choline , Craniocerebral Trauma , Creatine , Dementia , Exanthema , Leukoencephalopathies , Peripheral Nerves , Protons , SeizuresABSTRACT
Due to unknown underlying biochemical disorders, the delineation of Dejerine-sottas disease has been subject to recent controversy. This is a case of a 9 year-old Korean female with the clinical manifestations of sporadic occurence, chronic severe and symmetrical motor sensory polyneuropathy, thickened palpable peripheral nerves, facial diplegia, areflexia and abnormal pupillary reactivity to light. The electrophysiological studies are indicative of chronic demyelination neuropathy showing markedly slowed motor NCV, low and dispersed CMAPs and extreme dispersion of a SNAP. The pathology of the sural nerve reveals prominant hypomyelination and onion bulbs characterized by whorling concentric proliferations of the cytoplasmic processes of Schwann cells. The nosological problems of hypertrophic neuropathy in childhood are discussed.