Tissue-Specific Somatic Mosaicism in Spinal and Bulbar Muscular Atrophy Is Dependent on CAG-Repeat Length and Androgen Receptor–Gene Expression Level

The factors influencing the tissue-specific pattern of somatic mosaicism in CAG-repeat diseases have not yet been fully resolved. We performed a detailed analysis of the degree of somatic mosaicism in various tissues from 20 patients with spinal and bulbar muscular atrophy (SBMA), including 4 who we...

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Veröffentlicht in:American journal of human genetics 1999-10, Vol.65 (4), p.966-973
Hauptverfasser: Tanaka, Fumiaki, Reeves, Matthew F., Ito, Yasuhiro, Matsumoto, Michiyo, Li, Mei, Miwa, Shigeru, Inukai, Akira, Yamamoto, Masahiko, Doyu, Manabu, Yoshida, Mari, Hashizume, Yoshio, Terao, Shin-ichi, Mitsuma, Terunori, Sobue, Gen
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container_end_page 973
container_issue 4
container_start_page 966
container_title American journal of human genetics
container_volume 65
creator Tanaka, Fumiaki
Reeves, Matthew F.
Ito, Yasuhiro
Matsumoto, Michiyo
Li, Mei
Miwa, Shigeru
Inukai, Akira
Yamamoto, Masahiko
Doyu, Manabu
Yoshida, Mari
Hashizume, Yoshio
Terao, Shin-ichi
Mitsuma, Terunori
Sobue, Gen
description The factors influencing the tissue-specific pattern of somatic mosaicism in CAG-repeat diseases have not yet been fully resolved. We performed a detailed analysis of the degree of somatic mosaicism in various tissues from 20 patients with spinal and bulbar muscular atrophy (SBMA), including 4 who were deceased. The most outstanding feature was the prominent somatic mosaicism observed in the cardiac and skeletal muscles, composed predominantly of postmitotic cells, and in the skin, prostate, and testis. The CNS tissues, liver, and spleen showed the least mosaicism. The tissue distribution of somatic mosaicism in patients with SBMA was markedly different from that in patients with Huntington disease (HD) and from that in patients with dentatorubral-pallidoluysian atrophy (DRPLA). The degree of somatic mosaicism correlated with the CAG-repeat number but not with age at examination. Furthermore, tissues with a higher mosaicism level corresponded well to those with a higher expression level of androgen receptor protein. The tissue-specific pattern of somatic mosaicism related not only to cell composition with different cell turnover rates but to repeat size and gene expression levels, and postnatal cell division is unlikely to be a major cause of somatic mosaicism probably because of the relative stability of CAG repeat in SBMA.
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We performed a detailed analysis of the degree of somatic mosaicism in various tissues from 20 patients with spinal and bulbar muscular atrophy (SBMA), including 4 who were deceased. The most outstanding feature was the prominent somatic mosaicism observed in the cardiac and skeletal muscles, composed predominantly of postmitotic cells, and in the skin, prostate, and testis. The CNS tissues, liver, and spleen showed the least mosaicism. The tissue distribution of somatic mosaicism in patients with SBMA was markedly different from that in patients with Huntington disease (HD) and from that in patients with dentatorubral-pallidoluysian atrophy (DRPLA). The degree of somatic mosaicism correlated with the CAG-repeat number but not with age at examination. Furthermore, tissues with a higher mosaicism level corresponded well to those with a higher expression level of androgen receptor protein. The tissue-specific pattern of somatic mosaicism related not only to cell composition with different cell turnover rates but to repeat size and gene expression levels, and postnatal cell division is unlikely to be a major cause of somatic mosaicism probably because of the relative stability of CAG repeat in SBMA.</abstract><cop>Chicago, IL</cop><pub>Elsevier Inc</pub><pmid>10486315</pmid><doi>10.1086/302578</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record>
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subjects Adult
Aged
Aging - genetics
Alleles
Androgen receptor gene expression
Biological and medical sciences
CAG repeat
Degenerative and inherited degenerative diseases of the nervous system. Leukodystrophies. Prion diseases
DRPLA
Gene Expression
Humans
Huntington disease
Huntington Disease - genetics
Male
Medical sciences
Middle Aged
Mitosis
Molecular Sequence Data
Mosaicism - genetics
Muscle, Skeletal - metabolism
Muscle, Skeletal - pathology
Muscular Disorders, Atrophic - genetics
Muscular Disorders, Atrophic - pathology
Myocardium - metabolism
Myocardium - pathology
Myoclonic Epilepsies, Progressive - genetics
Neurology
Organ Specificity
Prostate - metabolism
Prostate - pathology
Receptors, Androgen - genetics
SBMA
Skin - metabolism
Skin - pathology
Somatic mosaicism
Testis - metabolism
Testis - pathology
Trinucleotide Repeat Expansion - genetics
Trinucleotide Repeats - genetics
title Tissue-Specific Somatic Mosaicism in Spinal and Bulbar Muscular Atrophy Is Dependent on CAG-Repeat Length and Androgen Receptor–Gene Expression Level
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