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KMID : 0191120000150010093
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Journal of Korean Medical Science
2000 Volume.15 No. 1 p.93 ~ p.98
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Deletion of SMN and NAIP genes in Korean patients with spinal muscular atrophy
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Shin S
Park SS/Hwang YS/Lee KW/Chung SG/Lee YJ/Park MH
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Abstract
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Childhood-onset proximal spinal muscular atrophies (SMAs) are an autosomal recessive, clinically heterogeneous group of neuronopathies characterized by selective degeneration of anterior horn cells. The causative genes to be reported are survival motor neuron (SMN) and neuronal apoptosis inhibitory protein (NAIP) genes. The deletion of telomeric copy of SMN (SMNT) gene was observed in over 95% of SMAs. The deletion rate of NAIP gene is 20-50% according to disease severity. The objective of this article is to genetically characterize the childhood-onset spinal muscular atrophy in Koreans. Five Korean families (14 constituents containing 5 probands) with SMA were included in this study. Polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP) were used for the deletion analysis of SMNT. Multiplex PCR method was used for NAIP analysis. Four probands showed deletion of SMNT gene. Deletion of SMNC (centromeric SMN) gene was found in one proband who did not show the deletion of SMNT gene and in the father of one proband who showed the deletion of SMNT gene. The deletion of NAIP gene was not found among all the studied individuals. The extent of deletion in Koreans was smaller than that in other studied population. PCR-RFLP deletion analysis can be applied to diagnose SMA and make a prenatal diagnosis.
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KEYWORD
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