Research press release




タツノオトシゴには、他の魚類や動物とは大きく異なる数々の注目すべき特徴がある。例えば、前方に突き出た長い管状の吻と歯のない小さな口があり、雄の育児嚢の中では卵から孵化した胚が稚魚に成長するまで過ごす。今回、Byrappa Venkateshの研究チームは、タイガーテールシーホース(Hippocampus comes)のゲノムを解読、解析して、こうしたユニークな特徴に寄与するゲノムの配列要素を解明した。


Analysis of the seahorse genome provides insights into the genetic basis of the unique traits of these creatures, such as their equine body shape and male pregnancy. The study, published in Nature this week, highlights the evolution of the seahorse genome, suggesting a higher evolutionary rate compared with the genomes of its close relatives (such as pipefish or seadragons).

Seahorses have a number of remarkable features that distinguish them from other fish and animals. For example, they have a long tube-shaped snout with a small mouth and no teeth, and it is the males that carry developing embryos in a brood pouch. Byrappa Venkatesh and colleagues sequence and analyse the genome of the tiger tail seahorse, Hippocampus comes, to understand the components of the genome that contribute to these unique features.

Five genes that have been associated with hatching of embryos in other fish are highly expressed within the male brood pouch, the authors report. They also observe altered expression of some regulatory elements that they think might have had a role in the evolution of the seahorse’s body shape. In addition, lack of genes that may be responsible for producing mineralized teeth are thought to contribute to the snout that makes the head of H. comes resemble that of a horse. They also find that the absence of a gene called tbx4, a known regulator of limb development, in the seahorse lineage may have had a role in the loss of pelvic fins.

doi: 10.1038/nature20595

「Nature 関連誌注目のハイライト」は、ネイチャー広報部門が報道関係者向けに作成したリリースを翻訳したものです。より正確かつ詳細な情報が必要な場合には、必ず原著論文をご覧ください。

メールマガジンリストの「Nature 関連誌今週のハイライト」にチェックをいれていただきますと、毎週最新のNature 関連誌のハイライトを皆様にお届けいたします。