Identification of a missense mutation in an adult-onset patient with glycogenosis type II expressing only one allele.
Identification of a missense mutation in an adult-onset patient with glycogenosis type II expressing only one allele.
复制标题
鉴定一名成年发病的仅表达一个等位基因的 II 型糖原增多症患者的错义突变。
DOI:
10.1089/dna.1991.10.681
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发表时间:
1991
影响因子:
3.1
通讯作者:
Hirschhorn,R
中科院分区:
文献类型:
--
作者:
Martiniuk,F;Mehler,M;Bodkin,M;Tzall,S;Hirschhorn,K;Zhong,N;Hirschhorn,R
The lysosomal enzyme acid alpha glucosidase (GAA) or acid maltase is deficient in glycogen storage disease type II. We sought to determine the molecular basis for the disease in an adult-onset patient, unusual for very low enzyme activity similar to that seen with the infantile-onset form and with a previously reported defect in phosphorylation. We constructed cDNA and genomic DNA libraries from the patient's cell line (GM 1935) and determined the nucleotide sequence of the coding region. There were three base-pair substitutions in one allele (C1935to A; G2446to A and C2780to T), all predicting amino acid changes (Asp-645 to Glu; Val-816 to Ile and Thr-927 to Ile). To determine which of the three base-pair substitutions resulted in loss of enzyme activity, we next utilized primer-directed mutagenesis and transient gene expression in an SV40-immortalized GAA-deficient fibroblast cell line. Only the construct containing the G2446to A mutation (Val-816 to Ile) lost GAA enzyme activity, while the other two substitutions (including the Thr-927 to Ile change that predicts a loss of a potential site for N-linked glycosylation and mannose phosphorylation) each resulted in enzyme activity equal to the control. Analysis of RFLPs in genomic DNA, as well as sequence analysis for the three base-pair alterations, indicated that the patient was a genetic compound. We next digested PCR-amplified cDNA (reverse-transcribed from RNA) withAatII to detect the base-pair 1935 substitution and found that virtually all of the mRNA was derived from the allele with the three base-pair substitutions. Our results provide the first identification of a disease-specific mutation in one allele of a patient with the adult onset form of glycogenosis type II.
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影响因子:
3.1
作者:
Martiniuk,F;Mehler,M;Tzall,S;Meredith,G;Hirschhorn,R
通讯作者:
Hirschhorn,R
DOI:
10.1016/0304-4165(81)90041-6
发表时间:
1981
期刊:
Biochimica et biophysica acta
影响因子:
--
作者:
J. Hilkens;J. Tager;F. Buijs;B. Brouwer;G. van Thienen;F. P. Tegelaers;J. Hilgers
通讯作者:
J. Hilgers
影响因子:
2.9
作者:
BROWN, BI;BROWN, DH;JEFFREY, PL
通讯作者:
JEFFREY, PL
DOI:
10.1002/prot.340040305
发表时间:
1988
期刊:
Proteins: Structure
影响因子:
--
作者:
Alison K. Barnes;C. Wynn
通讯作者:
C. Wynn
DOI:
10.1016/s0021-9258(17)39477-2
发表时间:
1985
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
A. Reuser;M. Kroos;R. Elferink;J. Tager
通讯作者:
J. Tager