Journal Article

Transgenic Mice Harboring a Full-Length Human Mutant <i>DRPLA</i> Gene Exhibit Age-Dependent Intergenerational and Somatic Instabilities of CAG repeats Comparable with Those in DRPLA patients

Toshiya Sato, Mutsuo Oyake, Kenji Nakamura, Kazuki Nakao, Yoshimitsu Fukusima, Osamu Onodera, Shuichi Igarashi, Hiroki Takano, Koki Kikugawa, Yoshinori Ishida, Takayoshi Shimohata, Reiji Koide, Takeshi Ikeuchi, Hajime Tanaka, Naonobu Futamura, Ryusuke Matsumura, Tetsuya Takayanagi, Fumiaki Tanaka, Gen Sobue, Osamu Komure, Mie Takahashi, Akira Sano, Yaeko Ichikawa, Jun Goto, Ichiro Kanazawa, Motoya Katsuki and Shoji Tsuji

in Human Molecular Genetics

Volume 8, issue 1, pages 99-106
Published in print January 1999 | ISSN: 0964-6906
Published online January 1999 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/8.1.99
Transgenic Mice Harboring a Full-Length Human Mutant DRPLA Gene Exhibit Age-Dependent Intergenerational and Somatic Instabilities of CAG repeats Comparable with Those in DRPLA patients

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Dentatorubral-pallidoluysian atrophy (DRPLA) is one among an increasing number of hereditary neurodegenerative diseases determined as being caused by unstable expansion of CAG repeats coding for polyglutamine stretches. To investigate the molecular mechanisms underlying CAG repeat instability, we established three transgenic lines each harboring a single copy of a full-length human mutant DRPLA gene carrying a CAG repeat expansion. These transgenic mice exhibited an age-dependent increase (+0.31 per year) in male transmission and an age-dependent contraction (−1.21 per year) in female transmission. Similar tendencies in intergenerational instabilities were also observed in human DRPLA parent-offspring pairs. The intergenerational instabilities of the CAG repeats may be interpreted as being derived from the instability occurring during continuous cell division of spermatogonia in the male, and that occurring during the period of meiotic arrest in the female. The transgenic mice also exhibited an age-dependent increase in the degree of somatic mosaicism which occurred in a cell lineage-dependent manner, with the size range of CAG repeats being smaller in the cerebellum than in other tissues including the cerebrum, consistent with observations in autopsied tissues of DRPLA patients. Thus, the transgenic mice described in this study exhibited age-dependent intergenerational as well as somatic instabilities of expanded CAG repeats comparable with those observed in human DRPLA patients, and are therefore expected to serve as good models for investigating the molecular mechanisms of instabilities of CAG repeats.

Journal Article.  6160 words.  Illustrated.

Subjects: Genetics and Genomics

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