片側性多小脳回症の多様な遺伝的原因
Abbe Lai1, Jennifer E Neil1, Shyam K Akula1
1Division of Genetics and Genomics, and Howard Hughes Medical Institute, Boston Children's Hospital, Boston, MA.
Annals of neurology
|February 11, 2026
まとめ
遺伝子検査により、過剰26%の個人で片側性多小脳回症(uPMG)の原因が特定された。一部の遺伝的原因は両側性PMGと重複するが、他は uPMG に特有であり、さらなる調査が保証される。
科学分野:
- 神経科学
- 遺伝学
- 発生生物学
背景:
- 多小脳回症(PMG)は一般的な皮質形成異常であり、その分布によって分類されることが多い。
- 片側性多小脳回症(uPMG)は、より一般的な両側性病変とは異なり、一方の脳半球に影響を及ぼす。
- 両側性PMGと比較した場合のuPMGの遺伝的基盤は、十分に探求されていない。
研究 の 目的:
- 片側性多小脳回症(uPMG)の遺伝的原因を調査すること。
- uPMGに対する遺伝子検査の診断的収率を評価すること。
- uPMGが両側性PMGと遺伝的原因を共有するのか、あるいは独自の遺伝的プロファイルを持つのかを判断すること。
主な方法:
- uPMGを有する35例の臨床データの後向き解析。
- 全参加者に対して遺伝子検査を実施。
- ボストン小児病院の脳発達遺伝科およびウォルシュ研究所からデータを収集。
主要な成果:
- 片側性多小脳回症(uPMG)の非血縁者において26.7%、全35例中10例で、原因となりうる遺伝子異常が特定された。
- 常染色体劣性遺伝の原因としてASPM、WDR62、TMEM216が特定された。
- 常染色体優性遺伝の原因として、22q欠失症候群、DYNC1H1、SCN3A、ACVRL1、ENGが特定された。
- DYNC1H1、TMEM216、ACVRL1のバリアントがuPMGで初めて報告された。
結論:
- uPMGと両側性PMGの遺伝的原因は重複する可能性があるが、一部はuPMGに特有である。
- uPMGの原因は、両側性PMGと同程度の頻度で見出される。
- uPMGを有する個人には、生殖細胞系列の遺伝子検査を推奨する。
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