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    受精卵或非“生命起始”?網友:教材是不是要改了……

    來源:神馬作文http://www.sxsrhm1.com

      一直以來,科學家們都認為,精卵結合受精以后就是生命。但是,最近中美胚胎學家的一項最新聯合研究成果表明,人類受精卵存在兩套獨立紡錘體,即從精卵結合到發生第一次有絲分裂期間,雙親染色體并沒有相互融合,而是各自保持空間上的獨立。這意味著處于此階段的受精卵,并不能稱之為真正意義上的“生命”。

      這一顛覆生物學經典理論的新發現,于近日作為期刊封面文章發表在該領域知名國際期刊《輔助生殖與遺傳學期刊》(JournalofAssistedReproductionandGenetics)上。

      對此,網友紛紛表示震驚……

      部分理科生、生物和醫學等相關專業師生,更是擔心教材要改了:

      還有一些網友表示,雙親染色體要先“相處”一下再成為生命,也沒毛病:

      另外,有網友提出了問題:那什么時候才算生命起源?

      還有一幫網友,說著說著畫風就不對了……

      抖機靈歸抖機靈,但這項研究還是很嚴肅的。自2015年起,中國知名胚胎學家徐小明博士與美國加州洛杉磯生殖中心實驗室主任孟勵教授等人,開始了對人類胚胎第一次細胞有絲分裂過程的探索性研究。

      “從精卵結合到發生第一次有絲分裂期間,雙親染色體并沒有相互融合,而是各自保持空間上的獨立。”徐小明博士指出,“只要兩套紡錘體之間出現時間或空間上的不同步,就會造成染色體的分離錯誤,這也更好地解釋了人類早期胚胎染色體異常比例高的原因。”

      同時,這一發現也引發了對人類“生命”定義的再思考。精卵結合后,人類父本和母本染色體并沒有立即相互融合,如同我們將藍色和黃色兩種顏料混合之初,兩種顏料仍維持著本來面目,只有經過充分混合之后,才會出現一種新的顏色——綠色。所以處于此階段的受精卵,并不能稱之為真正意義上的“生命”。

      此外,本發現對倫理學也有積極意義。目前在信奉天主教的國家,如意大利等國,是不允許一次對很多卵子進行受精的,因為之前觀點認為一旦精卵結合就是生命,所以這些國家禁止冷凍胚胎。每一對接受輔助生殖技術治療的夫婦一次只能受精1-2個卵子,如有剩余卵子,只能選擇冷凍。但是,冷凍卵子效率大大低于冷凍受精卵,而在本發現之后,未來在這些國家,或可直接冷凍受精卵。

      人類受精卵存在兩套獨立紡錘體這一最新發現,對輔助生殖醫學領域提出了新的挑戰與研究方向。徐小明表示,目前該研究尚處于初步探索階段,未來期待能夠取得更大的進展,為推動全世界輔助生殖技術安全、快速、高效的發展提供動力。

      對此,你怎么看?

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