胚性熱操作が神経発達に影響を与え、耐熱性を誘導する
Zixuan Fan1,2, Yuchen Jie1,2, Bowen Niu1,2
1Frontier Science Center for Molecular Design Breeding, State Key Laboratory of Animal Biotech Breeding, China Agricultural University, Beijing 100193, China.
Genes
|January 28, 2026
まとめ
胚性熱操作（ETM）は、家禽の耐熱性を高めるが、孵化率と脳の発達に悪影響を与える。この研究はETMを明らかにする
科学分野:
- 動物科学;発生生物学;ゲノミクス
背景:
- 家禽産業は、動物福祉と経済的持続可能性に影響を与える重大な熱ストレスの問題に直面している。;胚性熱操作（ETM）は、ひよこの熱耐性を向上させるための戦略として提案されているが、採卵鶏への影響についてはさらなる調査が必要である。;ETMが成長成績と神経発達に及ぼす影響は、ほとんど解明されていない。
研究 の 目的:
- 採卵鶏の熱耐性を高めるETMの有効性を検証すること。;ETMが孵化成績、成長、神経発達に及ぼす影響を調査すること。;ETMの脳および視床下部への影響の分子メカニズムを解明すること。
主な方法:
- 白色レグホン胚を胚発生13〜18日目に39.5℃でETMに供した。;孵化特性、熱耐性、形態計測、脳切片の組織病理学検査を評価した。;全脳および視床下部の転写プロファイリングにより、差次的発現遺伝子（DEG）を同定し、主要な遺伝子はRT-qPCRによって検証した。
主要な成果:
- ETMは孵化率を低下させ、奇形を増加させ、成長率を低下させた。;ETM処理されたひよこは、熱ストレス下で換羽の遅延と低い総排出腔温度を示し、改善された熱耐性を示した。;組織病理学検査により神経発達の障害が明らかになり、転写解析により視床下部における神経発達、恒常性、ストレス応答経路の変化が示され、HSP70、GPX1、IL-6、アポトーピック、DCX、AGRP遺伝子の発現変化が含まれた。
結論:
- ETMは採卵鶏の熱耐性を高めるが、孵化成績と脳の発達を犠牲にする。;視床下部のストレス応答と神経発達遺伝子ネットワークにおける広範な摂動が観察された。;本研究の結果は、ETMのメカニズム的洞察を提供し、家禽の熱耐性を向上させるための参照となる。
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