Multi-exon genotyping of SMN gene in spinal muscular atrophy by universal fluorescent PCR and capillary electrophoresis.
In this study, we established the first method for simultaneous evaluation of nine exons in the survival motor neuron (SMN) genes for full-scale genotyping. This method was used not only to quantify the copy numbers of highly homogenous telomeric SMN (SMN1)/centromeric SMN genes in exons 7 and 8 but also to determine intragenic mutations in all nine exons for complete diagnosis of spinal muscular atrophy (SMA). Additionally, we utilized the "universal fluorescent PCR" for simultaneously fluorescent labeling of eleven gene fragments (nine exons in SMN and two internal standards). Such technique is very beneficial for multi-exon analysis due to only requirement of one universal fluorescent primer which could fluorescently amplify all gene fragments. Of all 262 detected individuals, three subjects possessing different ratios of SMN1/centromeric SMN in the two exons were determined as gene conversion, and we also detected three interesting intragenic mutations (c.1 -39A>G, c.22_23insA in exon 1, c.84C>T in exon 2a) which were associated with the SMA patients owning one copy of SMN1 including two mutations never reported previously. This high-resolved method provided better potential technique for genotyping and identifying SMA, carrier and normal controls in large population.
Wang
Chun-Chi
CC
School of Pharmacy, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan.
Chang
Jan-Gowth
JG
Chen
Yen-Ling
YL
Jong
Yuh-Jyh
YJ
Wu
Shou-Mei
SM
D001483:Base Sequence; D019075:Electrophoresis, Capillary / Q000379:methods*; D005091:Exons; D018628:Gene Dosage; D006801:Humans; D009134:Muscular Atrophy, Spinal / Q000175:diagnosis / Q000235:genetics*; D009154:Mutation; D016133:Polymerase Chain Reaction / Q000379:methods*; D055533:Survival of Motor Neuron 1 Protein / Q000235:genetics*; D055540:Survival of Motor Neuron 2 Protein / Q000235:genetics*
D055533:Survival of Motor Neuron 1 Protein; D055540:Survival of Motor Neuron 2 Protein