物質使用障害は、外在化および内在化精神病理と特異的かつ障害特異的な遺伝的関連を示す
medRxiv : the preprint server for health sciences
|February 6, 2026
まとめ
遺伝的要因は、物質使用障害(SUD)と外在化および内在化行動を結び付けます。内在化遺伝的リスクを組み込むことは、SUDの予防と特定努力にとって重要です。
科学分野:
- 精神医学的遺伝学
- 行動遺伝学
- 神経科学
背景:
- 物質使用障害(SUD)は遺伝率が高く、外在化および内在化精神病理との遺伝的影響を共有しています。
- 以前の研究では、SUDと外在化障害との間の遺伝的重複に焦点が当てられていましたが、内在化障害の寄与はしばしば無視されていました。
研究 の 目的:
- SUD、外在化精神病理、および内在化精神病理との間の遺伝的関係を包括的に特徴付けること。
- 外在化特性とは独立して、SUDの遺伝的構造に対する内在化特性の寄与の程度を調査すること。
主な方法:
- ヨーロッパおよびアフリカ系祖先の集団からのゲノムワイド関連研究(GWAS)の要約統計量を利用しました。
- 遺伝的相関分析(オムニバス、部分、局所)、遺伝的因果モデル、および多因子スコア(PGS)分析を採用しました。
- ゲノムSEMを使用して、外在化および内在化精神病理との共有遺伝的影響を考慮した後のSUDの残差分散を調べました。
主要な成果:
- 外在化精神病理とすべてのSUDとの間に有意な遺伝的重複が見られ、内在化精神病理との重複はそれほど大きくないものの認められました。
- 内在化特性は、外在化遺伝的影響を制御した後でも、ほとんどのSUDの有意な遺伝的相関として残りました。
- タバコ使用障害(TUD)は、両方の精神病理スペクトルとの遺伝的関連が最も弱く、オピオイド使用障害(OUD)は内在化特性と最も強く関連していました。
結論:
- 共有遺伝的要因が、SUDと内在化障害との併存に寄与しています。
- 内在化障害の遺伝的リスクは、SUDの特定と予防戦略に統合されるべきです。
- SUDの将来の遺伝的研究では、その遺伝的構造を完全に解明するために、外在化および内在化精神病理の両方を考慮する必要があります。
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