マイオグルビン純表面積によって追跡された哺乳類の潜水能力の進化
Scott Mirceta1, Anthony V Signore, Jennifer M Burns
1Institute of Integrative Biology, University of Liverpool, Liverpool L69 7ZB, UK.
まとめ
ダイビングする哺乳類は,ミオグロビンにおける適応的変化によって,より高い筋肉ミオグロビン濃度を発達させた.
科学分野:
- 進化生物学の進化生物学について
- 分子進化は分子進化である.
- 哺乳類生理学 哺乳類生理学
背景:
- ダイビング哺乳類は,水中ニッチの利用に不可欠な,呼吸を止める耐久性を長持ちしています.
- これは,酸素の貯蔵量を増やし,効率的な酸素利用によって達成されます.
- ダイバーの筋肉ミオグルビン濃度の高さの分子基礎は,ほとんど不明のままです.
研究 の 目的:
- ダイビング哺乳類における高筋ミオグロビン濃度の分子および進化的基礎を調査する.
- 哺乳類の系統にわたるミオグルビン進化史を追跡する.
主な方法:
- 祖先のシーケンスの再構築が採用されました.
- 130種の哺乳類の系統を分析した.
- マイオグロービンの進化的変化を調査した.
主要な成果:
- ダイビング種において,マイオグロビンの表面積の上昇による適応性分子シグネチャーが特定されました.
- この電荷の変化は,最大マイオグルビン濃度とメカニズム的に関連しています.
- この研究は,ダイビング能力の進化についての洞察を提供します.
結論:
- この発見は,哺乳類の潜水能力を高める進化の経路を明らかにしている.
- 両生類の祖先は,エキドナ,モール,ヒラクス,ゾウに推論されている.
- この研究は,呼吸器の重要な色素であるミオグルビン (myoglobin) の進化に関する新しい視点を提供しています.
関連する概念動画
Gene Duplication and Divergence
The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
Gene Families
Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
Evolution of New Traits in Microbes
Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
Convergent Evolution
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
Speciation Rates
Overview
What is Evolutionary History?
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.


