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[Somatic mosaicism of expanded CAG trinucleotide repeat in spinal and bulbar muscular atrophy (SBMA)].

The CAG repeat in spinal and bulbar muscular atrophy (SBMA) is relatively stable in mitotic and meiotic processes as compared with other CAG repeat diseases. Previous reports indicate that SBMA does not manifest somatic mosaicism. However, detailed analysis in various tissues from 20 SBMA including 4 autopsied patients revealed the presence of the tissue-specific pattern of mosaicism. The prominent somatic mosaicism was observed in the cardiac and skeletal muscles, which are predominantly composed of postmitotic cells, and in the skin, prostate, and testis. The central nervous system (CNS) tissues, liver, and spleen showed smallest mosaicism. Such tissue-specific pattern of somatic mosaicism in SBMA is not explained by cell composition with different cell turnover rates. Other cell specific factors are likely more important for the somatic mosaicism in SBMA.

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