ケースレポート:MARSALAベースのPGT-MによるX連鎖性網膜分離症の伝達防止
Jieliang Li1, Xiaojun Wen1, Zhanhui Ou1
1Reproductive Center, Zhongshan Boai Hospital, Zhongshan, Guangdong, China.
Frontiers in ophthalmology
|January 30, 2026
まとめ
単一遺伝子疾患を対象とした着床前遺伝子検査(PGT-M)は、X連鎖性網膜分離症(XLRS)の伝達を効果的に防止しました。この遺伝子検査は健康な胚を特定し、家族が影響を受けていない子供をもうけることを可能にし、PGT-Mの有効性を示しました。
科学分野:
- 眼科学
- 遺伝学
- 生殖医学
背景:
- X連鎖性網膜分離症(XLRS)は、RS1遺伝子の変異によって引き起こされる遺伝性の網膜疾患であり、視力障害を引き起こします。
- XLRSの病歴を持つ家族が、将来の世代への病原性RS1バリアントの伝達を防ぐことを希望しました。
- 以前の世代では、この病状により両眼の視力障害や変視症を経験していました。
研究 の 目的:
- X連鎖性網膜分離症(XLRS)の伝達を防ぐための単一遺伝子疾患を対象とした着床前遺伝子検査(PGT-M)の成功例を報告すること。
- X連鎖性遺伝性疾患を持つ家族のための統合PGT-M戦略の有効性を示すこと。
主な方法:
- 次世代シーケンシング(NGS)およびサンガーシーケンシングを用いて、家族内の特定のc.187T>C(p.Cys63Arg)RS1変異を特定しました。
- 変異アレルシーケンシングと異数性および連鎖解析(MARSALA)プラットフォームを用いて、PGT-Mを実施しました。
- MARSALAは、生検された胚盤胞の全ゲノム増幅(MALBAC)、NGS、SNPハプロタイプ解析、およびコピー数変異(CNV)スクリーニングを含みました。
主要な成果:
- 8個の胚盤胞を解析し、家族性のRS1変異を持たない3個の異数性胚を特定しました。
- 遺伝カウンセリングと質の高い異数性胚(E1、6AA)の移植により、臨床妊娠に至りました。
- 妊娠中期羊水検査により、正常な男性核型およびRS1バリアントの不在が確認され、健康な赤ちゃんの誕生につながりました。
結論:
- 統合MARSALAベースPGT-M戦略は、XLRSのようなX連鎖性疾患の世代間伝達を防ぐのに効果的です。
- このアプローチにより、遺伝的リスクを持つ家族は健康な子孫をもうけることができます。
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