BabAの機能的適応は,H. pyloriのABO血型抗原に結合するアデシンである
Marina Aspholm-Hurtig1, Giedrius Dailide, Martina Lahmann
1Department of Odontology, section of Oral Microbiology, Umeå University, SE-901 87 Umeå, Sweden.
まとめ
ヘリコバクター・パイロリ菌株は,南米のインディアンの血液群O抗原に結合し,胃疾患のリスクを増やすことに特化しています. この細菌の適応は,宿主血液型Oの流行により進化した可能性が高い.
科学分野:
- 微生物学 微生物学とは
- 人間の遺伝学 人間の遺伝学
- 進化生物学の進化生物学について
背景:
- ヘリコバクター・パイロリ感染症は,胃疾患の主要な原因です.
- 宿主組織への細菌の粘着は,コロニー化と病原性にとって極めて重要です.
- フクソシル化血型抗原は,H. pylori. の主要結合標的である.
研究 の 目的:
- ヘリコバクター・パイロリ菌株の結合特性を,フクソシル化血型抗原に調べる.
- H. pyloriの結合パターンと宿主血液型抗原の流行の間の進化的関係を調査する.
主な方法:
- 様々な血液型アンチゲン (A,B,O) に対するH. pylori菌株の粘着性の分析.
- バクテリアの結合親和性の定量化.
- ババA遺伝子の配列を解析して,多様性の選択を特定する.
主要な成果:
- ほとんどのH. pylori菌株 (一般型) は,複数の血液型抗原 (A,B,O) に結合する.
- 南米のインディアン系株 (専門家) の有意な割合は,血型Oに優先的に結合する.
- バクテリアの結合親和性は1500倍まで変化し,babA配列の多様化選択の証拠があった.
結論:
- H. pyloriは,ホストの血液型抗原,特にインディアン集団の血液型Oに特殊な結合を示す.
- 宿主血型抗原の流行は,細菌の結合特異性の進化を促す可能性が高い.
- 選択のサイクルにより,O-支配的な集団では,一般的結合が専門的結合に取って代わられる可能性があります.
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