クリーンルームの微生物に対する空間環境シミュレーションの影響
Chelsi D Cassilly1, Atul M Chander2, Jason A Vaughn1
1NASA Marshall Space Flight Center, Materials and Processes Laboratory, Huntsville, AL, United States.
Frontiers in microbiology
|September 4, 2025
まとめ
NASAのクリーンルームには 宇宙環境に耐える 耐久性の高い細菌がいます これらの発見は,現在の胞子に焦点を当てた汚染評価に挑戦し,将来の宇宙ミッションのための惑星保護戦略を参考にします.
科学分野:
- 天体生物学と宇宙微生物学
- 惑星 保護
- ゲノミクスと微生物生態学
背景:
- 微生物汚染はNASAのミッションに重大なリスクをもたらし 材料の完全性,環境保護,科学的データの信頼性,乗組員の健康に影響を与えます
- 既存の浄化・滅菌プロトコルは 微生物が宇宙探査に与える影響を最小限に抑えるために 強化する必要があります
- 微生物のレジリエンスを理解することは 生物学的負担の制御戦略を 開発する上で極めて重要です
研究 の 目的:
- NASAのクリーンルームの 耐久性の高い微生物を特定し 特徴づけること
- これらの微生物が宇宙環境のストレス要因に 耐えるかを評価する.
- 惑星保護の改善のための微生物の回復力のゲノム基盤を分析する.
主な方法:
- マーシャル宇宙飛行センターのクリーンルームや 制御されていない空間の空気と表面のサンプル採取
- 82の微生物株の分離,特徴化,ストレス試験 (乾燥,真空,陽子,紫外線)
- 4つの高耐性非胞子形成種の全ゲノム配列と比較ゲノム分析
主要な成果:
- 胞子形成しない4種 (Arthrobacter koreensis PPS68, Paenarthrobacter sp. PPS72 ミセトコーラ sp PPS117 エルウィニア sp. PPS120) は,空間ストレッサーに対する高い耐性を示した.
- ゲノム解析により,アミノ酸の生物合成,炭水化物の代謝,酸化ストレス,DNA修復などのストレス反応に関する遺伝子が明らかになった.
- Arthrobacter koreensis PPS68は DNA修復およびオスモプロテクション遺伝子を含め,乾燥と放射線耐性に関するユニークなゲノム特性を示した.
結論:
- クリーンルームの耐久性のある 胞子形成しないバクテリアは 極端な宇宙環境で生き残るための適応を 備えています
- 現在の胞子中心の生物負担測定は,包括的な惑星保護には不十分かもしれません.
- ゲノムデータとストレスアッセイは,宇宙ミッションの微生物リスク評価と浄化設計のための貴重なリソースを提供します.
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