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【中國新聞網】青藏高原地質活動系高原鰍屬群體基因交流主要原因

文章來源:中國新聞網 羅云鵬   發布時間:2019-04-12  【字號:     】  

  記者11日從中國科學院西北高原生物研究所了解到,該所高原魚類進化與功能基因組學學科組在高原鰍屬群體遺傳學研究中發現,青藏高原地質活動系高原鰍屬群體基因交流主要原因。

  中國科學院西北高原生物研究所趙凱課題組在早期工作中注意到,生活在青藏高原東北部區域的粗壯高原鰍、酒泉高原鰍、岷縣高原鰍、黃河高原鰍和擬鯰高原鰍這五個物種有著十分混亂的群體遺傳結構。

  進一步研究顯示,這種混亂的遺傳結構僅發生在線粒體數據中,核基因的研究結果則與“物種-種群”的劃分更加吻合。溯祖模擬分析顯示基因流是引起上述線粒體與核基因遺傳結構不一致的主要原因。

  趙凱課題組結合分子鐘分析與已知的地質資料推測,中新世晚期以來青藏高原頻繁的地質活動塑造了高原鰍屬群體間復雜的演化歷史,并導致廣泛的物種(種群)間基因交流,這一研究也為現有物種的分類修訂提出了建議。

  據了解,跨物種的基因交流在自然界頻繁發生,并往往導致對物種進化歷史的錯誤推斷,基因流的發生形式及原因是進化生物學研究的重點之一。




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