Neuroscience bulletin · 2007
Intergeneration CAG expansion in a Wuhan juvenile-onset Huntington disease family.
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Liu Yuan, Shen Yan, Li He, Wang Hui, Yang Zhen-Rong, Chen Yan, Tang Yan-Ping
Аннотация
OBJECTIVE: To make early diagnosis of IT15 gene mutation in a Wuhan juvenile-onset Huntington disease (HD) family, for providing them with genetic counseling, and making preparation for the further research on pathogenesis and experimental therapy of HD.
METHODS: According to the principle of informed consent, we extracted genomic DNA from peripheral blood samples and carried genetic diagnosis of pathogenic exon 1 of IT15 gene by modified touchdown PCR and DNA sequencing methods.
RESULTS: Eight of twenty-five family members carried abnormal allele: III(10), III(12), III(14), IV(3), and V(2) carried (CAG) (48), IV(11) and IV(12) carried (CAG) (67), and IV(14) carried (CAG) (63), in contrast with the 8-25 CAG trinucleotides in the members of control group. IV(14) carried 15 more CAG trinucleotides than her father III(10).
CONCLUSION: The results definitely confirm the diagnosis of HD and indicate the CAG trinucleotide repeat expansion of IT15 gene in this HD family. In addition, CAG expansion results in juvenile-onset and anticipation (characterized by earlier age of onset and increasing severity) of the patient IV(12).
METHODS: According to the principle of informed consent, we extracted genomic DNA from peripheral blood samples and carried genetic diagnosis of pathogenic exon 1 of IT15 gene by modified touchdown PCR and DNA sequencing methods.
RESULTS: Eight of twenty-five family members carried abnormal allele: III(10), III(12), III(14), IV(3), and V(2) carried (CAG) (48), IV(11) and IV(12) carried (CAG) (67), and IV(14) carried (CAG) (63), in contrast with the 8-25 CAG trinucleotides in the members of control group. IV(14) carried 15 more CAG trinucleotides than her father III(10).
CONCLUSION: The results definitely confirm the diagnosis of HD and indicate the CAG trinucleotide repeat expansion of IT15 gene in this HD family. In addition, CAG expansion results in juvenile-onset and anticipation (characterized by earlier age of onset and increasing severity) of the patient IV(12).