Clinical and genetic study of SPG6 mutation in a Chinese family with hereditary spastic paraplegia.
Mutations in the NIPA1 gene cause autosomal dominant hereditary spastic paraplegia (ADHSP). To date, little is known about the relationship between genotype-phenotype correlation. In order to examine the gene mutation associated with the genotype-phenotype of Chinese kindred with ADHSP, linkage analysis and mutation detection were performed. For affected family members, clinical analysis, electrophysiological examination and MRI of the brain and spinal cord were also performed. Every effected patient had a c316 (G106R) mutation in the NIPA1 gene. Neurophysiological examination revealed decreased amplitude of compound muscle action potentials (CMAP) from the tibial and peroneal motor nerves in most patients. Sensory nerve action potential (SNAP) from the tibialis nerve was not elicited in most patients. Central motor conduction time (CMCT) to the abductor pollicis brevis muscle (APB), first metatarsal interosseus muscle (FMI) and anterior tibial muscle (AT) were either absent or clearly prolonged in all patients. Spinal cord MRI showed different levels of atrophy in every affected individual. These lesions present an increased spot or patch signal on transverse axis T2WI and an intense signal of continual longitudinal strip on the anteroposterior axis. Our study supports that mutations in the NIPA1 gene cause ADHSP and further demonstrates genotype-phenotype correlations in SPG6.
Liu
Shi Guo
SG
Graduate School of Peking Union Medical College, Beijing, China.
Zhao
Jian Jun
JJ
Zhuang
Mao You
MY
Li
Fei Feng
FF
Zhang
Qing Jun
QJ
Huang
Shang Zhi
SZ
Che
Feng Yuan
FY
Lu
De Guo
DG
Liu
Shi En
SE
Teng
Ji Jun
JJ
Ma
Xu
X
D000200:Action Potentials / Q000502:physiology; D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D000368:Aged; D002681:China; D004247:DNA / Q000235:genetics; D004576:Electromyography; D004594:Electrophysiology; D019054:Evoked Potentials, Motor / Q000502:physiology; D005260:Female; D005838:Genotype; D006801:Humans; D008126:Lod Score; D008279:Magnetic Resonance Imaging; D008297:Male; D008565:Membrane Proteins / Q000235:genetics*; D008875:Middle Aged; D009154:Mutation / Q000235:genetics / Q000502:physiology; D009431:Neural Conduction / Q000502:physiology; D010375:Pedigree; D010641:Phenotype; D015419:Spastic Paraplegia, Hereditary / Q000235:genetics* / Q000473:pathology*; D013116:Spinal Cord / Q000473:pathology
D008565:Membrane Proteins; C478824:NIPA1 protein, human; D004247:DNA