Does the severity of the LGMD2A phenotype in compound heterozygotes depend on the combination of mutations?

Does the severity of the LGMD2A phenotype in compound heterozygotes depend on the combination of mutations?
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复合杂合子中 LGMD2A 表型的严重程度是否取决于突变的组合?

DOI:
10.1002/mus.22194
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发表时间:
2011
期刊:
影响因子:
3.4
通讯作者:
Lopez de Munain A
Lopez de Munain A
中科院分区:
医学3区
文献类型:
--
作者:
Saenz A;Ono Y;Sorimachi H;Goicoechea M;Leturcq F;Blazquez L;Garcia-Bragado F;Marina A;Poza JJ;Azpitarte M;Doi N;Urtasun M;Kaplan JC;Lopez de Munain A

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肢带型肌营养不良症2A型(LGMD 2A)是由钙蛋白酶-3/p94缺乏引起的。虽然大多数LGMD 2A患者的症状通常是同质的,但在疾病的严重程度和进展方面存在一些差异。方法:我们描述了2例携带相同复合杂合突变组合的患者。(pG 222 R/pR 748 Q),并且与具有每个错义突变的纯合子相比,其症状异常良性。与pG 222 R和pR 748 Q突变相结合观察到的良性表型表明,这可能是由于复合杂合性的补偿效应,而不是单个突变本身。我们的分析表明,这两个突变产生不同的影响的蛋白酶活性的钙蛋白酶-3,这表明“分子互补”在这些patients.Conclusion:我们提出了几个假设来解释这种特定的组合突变可能会拯救正常的蛋白水解活性的钙蛋白酶-3,导致异常良性的表型。肌肉神经,2011年
Introduction: Limb‐girdle muscular dystrophy type 2A (LGMD2A) is caused by a deficiency of calpain‐3/p94. Although the symptoms in most LGMD2A patients are generally homogeneous, some variation in the severity and progression of the disease has been reported.Methods: We describe 2 patients who carry the same combination of compound heterozygous mutations (pG222R/pR748Q) and whose symptoms are exceptionally benign compared to homozygotes with each missense mutation.Results: The benign phenotype observed in association with the combined pG222R and pR748Q mutations suggested that it may result from a compensatory effect of compound heterozygosity rather than the individual mutations themselves. Our analyses revealed that these two mutations exert different effects on the protease activity of calpain‐3, suggesting “molecular complementation” in these patients.Conclusion: We propose several hypotheses to explain how this specific combination of mutations may rescue the normal proteolytic activity of calpain‐3, resulting in an exceptionally benign phenotype. Muscle Nerve, 2011
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