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29th May 2008

DNA’nın üstüne imzasını atmış

KategoriGenetik Bilim, Yeni Haberler |

GENETİĞİ DEĞİŞTİRİLMİŞ DEĞİL, İNSAN TARAFINDAN YENİDEN YARATILMIŞ CANLININ DNA’SINA İMZA ATILDIĞI ORTAYA ÇIKTI

genetikharita1.jpgİlk kez bir bakterinin sentetik genomunu (DNA dizilimi) oluşturup bunu yakında canlı bir hücreye yerleştirerek tarihteki “ilk yapay organizma”yı yaratmaya hazırlanan Amerikalı biyolog ve girişimci Craig Venter’ın, söz konusu DNA’nın genetik koduna kendi ismini yazdığı ortaya çıktı.

ALTMIŞ bir yaşındaki bilim adamı ve girişimci Craig Venter, ilk sentetik genomu nasıl yarattığını Science Dergisi’nde geçen hafta yayınlanan makalesinde anlatmıştı. Dergi, deneyle ilgili ayrıntıları internet sitesine eklenen belgelerde açıkladı. Bu eklere göre öncü bilim adamı Venter, kimyasal maddeler kullanarak yarattığı ilk sentetik genomun “filigran” olarak bilinen genetik kod dizilerinden birine, açılımı “Craig Venter” olan “TTAACTAGCTA ATGTCGTGCAATTGGAGTAG AGAACACAGAACG ATTAACTAGCTAA” şifresini yerleştirdi.

Diğer dört şifre ise, Venter’ın başında bulunduğu enstitünün ve deneyde emeği geçen çalışma arkadaşlarının isimlerinden oluşuyor. Genetik alfabede, amino asit dizilişlerini simgeleyen dört “harf” var ve bunları kullanarak bir yazı oluşturmak mümkün. Yapay bir bakterinin dairesel genetik şifresini oluşturan bu yapı, “insan yapımı en büyük DNA” olarak tarihe geçti.

Canlı bir hücreye yerleştirildikten sonra hücrenin kontrolünü ele geçirecek olan sentetik kromozom, ilk yapay organizmanın doğmasını sağlayacak. Ancak uzmanlar, Venter’ın “imza attığı” kromozomun yapay yaşam yolundaki son deneyde kullanılmayacağını düşünüyor.

Bu aşamada kullanılacak yeni DNA’ya da aynı şekilde isim yazılıp yazılmayacağı ise henüz bilinmiyor. Venter, daha önce de, insanın genetik şifresini çözmek için başladığı çalışmada kendi DNA’sını kullanarak tartışma yaratmıştı.

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