障害モデル研究部は、新たに明らかにされた遺伝性疾患のモデル動物の作製を行う障害モデル作製開発研究室と、作製されたモデル動物の障害の解析と治療法の評価を行う障害モデル解析応用研究室から構成されます。
知的障害、てんかん、自閉症スペクトラム障害などの神経疾患の症例から新たに明らかになった原因遺伝子に相当する遺伝子を改変したモデルマウスの作製や、疾患モデルマウスの詳細な病態解析と治療法探索を行い、将来患者に還元できる新しい事実や解釈を得ることを研究活動の目的としています。目的を達成するため、マウス、ラット、ウサギを用いた動物実験、動物組織の染色や診断、細胞培養、生化学的分析や遺伝子分析、電気生理学実験等を行っています。
胎児後期から新生児期に発生した異常によって脳性麻痺、精神発達遅滞、運動障害、てんかんなどの脳障害が起こることを周生期(周産期)脳障害と呼び、この疾患原因を探り治療法を開発する研究を障害モデル研究部の前身である周生期学部は行っていました。昭和47年に発達障害研究所が設立された当時、周生期脳障害害の原因の大部分は分娩に伴うものだろうと考えられてきました。
しかし近代的麻酔により帝王切開が安全に行われるようになって平成7年頃までに新生児仮死の多くを防ぐことができるようになったのに周生期脳障害は減少しませんでした。この歴史的事実は周生期脳障害のほとんどの原因は分娩より前に決まっていることを示唆しています。
近年になって安価で高速度の次世代シークエンスが患者ゲノムを網羅的に探索し始めると、出生前後の環境に原因があると長らく信じられていた脳性麻痺患者の半数程度に遺伝子変異があるという報告もされました。さらに次世代シークエンスは、両親からの遺伝だけでなく両親には無い異常が精子や卵子に新しく生じた遺伝子異常が多くの脳障害を引き起こすことも明らかにしてきました。
このような時代背景にあり、障害モデル研究部は周生期学部が行っていた周生期脳障害の研究を引き継ぐだけでなく、さらに周生期脳障害と呼ばれてきた疾患のかなりの原因を占めると思われる遺伝的な原因がどう脳障害に進展するかを特に深く調べています。
ここ数年は主に、①非症候群型の知的障害、MRD43のモデルマウスであるSchnurri-2遺伝子変異に関する研究、②ラットモデルを用いた臍帯血移植や低酸素虚血性脳症治療の研究、③少歯症原因遺伝子の神経細胞への影響の研究、④PEHO症候群のモデルマウスであるGirdin遺伝子変異に関する研究を行っています。この他、同じ棟にある中央病院と共同で重症心身障害患者に新しく見つかった遺伝子変異と症状を関連づけする努力も続けています。
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