{"id":43097,"date":"2012-08-01T20:46:28","date_gmt":"2012-08-01T17:46:28","guid":{"rendered":"https:\/\/bilimvegelecek.com.tr\/?p=43097"},"modified":"2020-04-24T20:54:07","modified_gmt":"2020-04-24T17:54:07","slug":"antik-yasama-evrilmek-icin-yeni-bir-sans-500-milyon-yillik-gen-gunumuz-organizmasina-yerlestirildi","status":"publish","type":"post","link":"https:\/\/bilimvegelecek.com.tr\/index.php\/2012\/08\/01\/antik-yasama-evrilmek-icin-yeni-bir-sans-500-milyon-yillik-gen-gunumuz-organizmasina-yerlestirildi","title":{"rendered":"Antik ya\u015fama evrilmek i\u00e7in yeni bir \u015fans: 500 milyon y\u0131ll\u0131k gen, g\u00fcn\u00fcm\u00fcz organizmas\u0131na yerle\u015ftirildi"},"content":{"rendered":"<p>500 milyon y\u0131ld\u0131r yap\u0131m a\u015famas\u0131nda olan bu proje Jurassic Park filmindeki bir sahne de\u011fil, Georgia Teknoloji Enstit\u00fcs\u00fc\u2019nde ger\u00e7ekle\u015ftirilen bir \u00e7al\u0131\u015fma.<\/p>\n<p>Georgia Teknoloji Enstit\u00fcs\u00fc ara\u015ft\u0131rmac\u0131lar\u0131, paleo-deneysel evrim ad\u0131 verilen bir i\u015flem kullanarak, 500 milyon y\u0131ll\u0131k bir bakterinin genini yeniden ya\u015fama d\u00f6nd\u00fcrd\u00fcler ve o geni g\u00fcn\u00fcm\u00fcz\u00fcn modern <em>Escherichia<\/em> <em>coli<\/em> (<em>E.<\/em> coli) bakterisine yerle\u015ftirdiler. Bu bakteri 1.000\u2019den fazla nesildir yeti\u015fmekte ve ara\u015ft\u0131rmac\u0131lara evrim s\u00fcrecini g\u00f6zlemleyebilmek i\u00e7in b\u00fcy\u00fck bir f\u0131rsat vermekte.<\/p>\n<p>Georgia Teknoloji Enstit\u00fcs\u00fc, NASA Ribozomal K\u00f6ken ve Evrim Merkezi\u2019nde astrobiyoloji ara\u015ft\u0131rmac\u0131s\u0131 olan Bet\u00fcl Ka\u00e7ar, \u201cBu durum, hayat\u0131n molek\u00fcler band\u0131n\u0131 geri sarma ve ba\u015ftan oynatma noktas\u0131na ne kadar yakla\u015ft\u0131\u011f\u0131m\u0131z\u0131 g\u00f6steriyor. Antik bir genin modern organizmada geli\u015fiminin g\u00f6zlemlenmesi, bize daha \u00f6nceden izlenen evrimsel yolun kendini tekrar m\u0131 edece\u011fini yoksa ya\u015fam\u0131n farkl\u0131 bir yol izleyerek ona uyum mu sa\u011flayaca\u011f\u0131n\u0131 g\u00f6rmemize izin verir.\u201d dedi.<\/p>\n<p>2008 y\u0131l\u0131nda, Bet\u00fcl Ka\u00e7ar\u2019\u0131n doktora sonras\u0131 dan\u0131\u015fman\u0131 Biyoloji Do\u00e7enti Eric Gaucher, <em>E.<\/em> <em>coli<\/em>\u2019nin \u00f6nemli bir proteini olan EF-Tu\u2019nun (Uzama Fakt\u00f6r\u00fc-Tu) antik yap\u0131s\u0131n\u0131n genetik dizisini ba\u015far\u0131yla tan\u0131mlad\u0131. EF\u2019ler bakterilerde en yayg\u0131n bulunan proteinlerden biridir. Ayr\u0131ca bakterilerin hayatta kalabilmesi i\u00e7in gerekli olmakla beraber t\u00fcm h\u00fccresel ya\u015famlar\u0131nda da bulunurlar. EF\u2019lerin bu hayati rolleri, onlar\u0131 ara\u015ft\u0131rmac\u0131lar\u0131n evrimle ilgili sorular\u0131n\u0131n cevaplar\u0131 i\u00e7in m\u00fckemmel proteinler haline getiriyor.<\/p>\n<p><em>1.coli<\/em>\u2019deki modern genin do\u011fru kromozomal s\u0131radaki antik genle de\u011fi\u015ftirilmesi i\u015fleminin ba\u015far\u0131yla sonu\u00e7lanmas\u0131ndan sonra Ka\u00e7ar sekiz \u00f6zde\u015f bakteri su\u015fu elde etti ve \u201cantik ya\u015fam\u0131n\u201d yeniden evrimle\u015fmesine izin verdi. Modern ve antik genlerden olu\u015fan bu kimerik bakteriler hayatta kalabilmekte ancak, yaln\u0131zca modern genleri ta\u015f\u0131yan benzerlerine k\u0131yasla iki kat daha yava\u015f b\u00fcy\u00fcmekte.<\/p>\n<p>Eric Gaucher , \u201cDe\u011fi\u015ftirilmi\u015f organizmalar, en az\u0131ndan ba\u015flang\u0131\u00e7ta, g\u00fcn\u00fcm\u00fcz modern organizmalar\u0131 kadar sa\u011fl\u0131kl\u0131 ve formda de\u011fildi. Bu durum de\u011fi\u015ftirilmi\u015f organizmalar\u0131n her ge\u00e7en g\u00fcn biriken mutasyonlara kar\u015f\u0131 uyum sa\u011flamalar\u0131 ve daha uygun hale gelebilmeleri i\u00e7in m\u00fckemmel bir senaryo yaratt\u0131.\u201d dedi.<\/p>\n<p>\u0130lk 500 nesil sonunda, de\u011fi\u015ftirilmi\u015f organizmalar\u0131n b\u00fcy\u00fcme oran\u0131 nihayet artt\u0131 ve ara\u015ft\u0131rmac\u0131lar bakterilerin uyum sa\u011flama s\u00fcre\u00e7lerini anlayabilmek i\u00e7in t\u00fcm sekiz neslin de genomunu diziledi.<\/p>\n<p>Bu \u00e7al\u0131\u015fmayla, de\u011fi\u015ftirilmi\u015f organizmalarda, yaln\u0131zca uyumluluk d\u00fczeyi modern organizmalardaki g\u00fcn\u00fcm\u00fcz seviyelerine \u00e7\u0131kar\u0131lmad\u0131; ayr\u0131ca bu canl\u0131lar modern benzerlerine k\u0131yasla daha da sa\u011fl\u0131kl\u0131 hale getirildi.<\/p>\n<p>Ara\u015ft\u0131rmac\u0131lar \u00e7al\u0131\u015fmaya daha yak\u0131ndan bakt\u0131klar\u0131nda, her EF-Tu geninin mutasyon ge\u00e7irmedi\u011fini fark etti. Bunun yerine, bakteri i\u00e7erisindeki antik EF-Tu genleriyle etkile\u015fime giren modern proteinler mutasyon ge\u00e7iriyordu ve bu mutasyonlar bakterinin uyumlulu\u011funu artt\u0131rmak i\u00e7in gerekli adaptasyonlardan sorumluydu. K\u0131sacas\u0131, antik genler hen\u00fcz kendi modern hallerine benzemek i\u00e7in mutasyon ge\u00e7irmi\u015f de\u011fil. Bundan ziyade bakteriler adaptasyon i\u00e7in yeni bir evrimsel yol buldu.<\/p>\n<p>Ara\u015ft\u0131rman\u0131n sonu\u00e7lar\u0131, son NASA Uluslararas\u0131 Astrobiyoloji Bilim Konferans\u0131\u2019nda sunuldu. Ara\u015ft\u0131rmac\u0131lar proteinlerin tarihsel yollar\u0131n\u0131 takip edip etmeyece\u011fini ya da tamam\u0131yla yeni bir yola uyum sa\u011flay\u0131p sa\u011flamayaca\u011f\u0131n\u0131 g\u00f6rmek i\u00e7in yeni nesillerle \u00e7al\u0131\u015fmaya devam edecek. Bet\u00fcl Ka\u00e7ar, \u201cBiz bu \u00e7al\u0131\u015fman\u0131n, bir organizman\u0131n evrimsel ge\u00e7mi\u015finin gelece\u011fini s\u0131n\u0131rland\u0131r\u0131p s\u0131n\u0131rland\u0131rmamas\u0131 ve evrimin canl\u0131lar\u0131 her zaman belirlenmi\u015f, tek bir noktaya g\u00f6t\u00fcrmesi ya da belirli bir soruna kar\u015f\u0131 birden fazla \u00e7\u00f6z\u00fcm\u00fcn\u00fcn olup olmamas\u0131 gibi evrimsel ve molek\u00fcler biyolojiyle ilgili uzun zamand\u0131r s\u00fcregelen sorunlara de\u011finmemizde yard\u0131mc\u0131 olaca\u011f\u0131n\u0131 d\u00fc\u015f\u00fcn\u00fcyoruz.\u201d dedi.<\/p>\n<p><strong>Kaynak:<\/strong> \u201cGiving Ancient Life Another Chance to Evolve: Scientists Place 500-Million-Year-Old Gene in Modern Organism\u201d, http:\/\/www.sciencedaily.com\/releases\/2012\/07\/120711100726.htm (11 Temmuz 2012).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>500 milyon y\u0131ld\u0131r yap\u0131m a\u015famas\u0131nda olan bu proje Jurassic Park filmindeki bir sahne de\u011fil, Georgia Teknoloji Enstit\u00fcs\u00fc\u2019nde ger\u00e7ekle\u015ftirilen bir \u00e7al\u0131\u015fma. Georgia Teknoloji Enstit\u00fcs\u00fc ara\u015ft\u0131rmac\u0131lar\u0131, paleo-deneysel evrim ad\u0131 verilen bir i\u015flem kullanarak, 500 milyon y\u0131ll\u0131k bir bakterinin genini yeniden ya\u015fama d\u00f6nd\u00fcrd\u00fcler ve o geni g\u00fcn\u00fcm\u00fcz\u00fcn modern Escherichia coli (E. coli) bakterisine yerle\u015ftirdiler. Bu bakteri 1.000\u2019den fazla [&hellip;]<\/p>\n","protected":false},"author":799,"featured_media":43101,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[139,38],"tags":[3089,493,6391,292,6195,34],"class_list":["post-43097","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-102-sayi","category-dergi-sayilari","tag-antik-yasam","tag-bakteri","tag-escherichia-coli","tag-genetik","tag-nesil","tag-teknoloji"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.8 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"B\u00fc\u015fra Ahata\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/bilimvegelecek.com.tr\/index.php\/2012\/08\/01\/antik-yasama-evrilmek-icin-yeni-bir-sans-500-milyon-yillik-gen-gunumuz-organizmasina-yerlestirildi\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.8\" \/>\n\t\t<meta property=\"og:locale\" content=\"tr_TR\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Bilim ve Gelecek\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Antik ya\u015fama evrilmek i\u00e7in yeni bir \u015fans: 500 milyon y\u0131ll\u0131k gen, g\u00fcn\u00fcm\u00fcz organizmas\u0131na yerle\u015ftirildi | Bilim ve Gelecek\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/bilimvegelecek.com.tr\/index.php\/2012\/08\/01\/antik-yasama-evrilmek-icin-yeni-bir-sans-500-milyon-yillik-gen-gunumuz-organizmasina-yerlestirildi\" \/>\n\t\t<meta property=\"fb:app_id\" content=\"2104805563100892\" \/>\n\t\t<meta property=\"fb:admins\" content=\"1250955469\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2012\/08\/23.jpeg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2012\/08\/23.jpeg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2012-08-01T17:46:28+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2020-04-24T17:54:07+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/bilimvegelecekdergisi\/\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:site\" content=\"@bilimvegelecek\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Antik ya\u015fama evrilmek i\u00e7in yeni bir \u015fans: 500 milyon y\u0131ll\u0131k gen, g\u00fcn\u00fcm\u00fcz organizmas\u0131na yerle\u015ftirildi | Bilim ve Gelecek\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/bilimvegelecek.com.tr\/wp-content\/uploads\/2012\/08\/23.jpeg\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/bilimvegelecek.com.tr\\\/index.php\\\/2012\\\/08\\\/01\\\/antik-yasama-evrilmek-icin-yeni-bir-sans-500-milyon-yillik-gen-gunumuz-organizmasina-yerlestirildi#article\",\"name\":\"Antik ya\\u015fama evrilmek i\\u00e7in yeni bir \\u015fans: 500 milyon y\\u0131ll\\u0131k gen, g\\u00fcn\\u00fcm\\u00fcz organizmas\\u0131na yerle\\u015ftirildi | Bilim ve Gelecek\",\"headline\":\"Antik ya\\u015fama evrilmek i\\u00e7in yeni bir \\u015fans: 500 milyon y\\u0131ll\\u0131k gen, g\\u00fcn\\u00fcm\\u00fcz organizmas\\u0131na yerle\\u015ftirildi\",\"author\":{\"@id\":\"https:\\\/\\\/bilimvegelecek.com.tr\\\/index.php\\\/author\\\/bahata#author\"},\"publisher\":{\"@id\":\"https:\\\/\\\/bilimvegelecek.com.tr\\\/#organization\"},\"image\":{\"@type\":\"ImageObject\",\"url\":\"https:\\\/\\\/bilimvegelecek.com.tr\\\/wp-content\\\/uploads\\\/2012\\\/08\\\/23.jpeg\",\"width\":1280,\"height\":720},\"datePublished\":\"2012-08-01T20:46:28+03:00\",\"dateModified\":\"2020-04-24T20:54:07+03:00\",\"inLanguage\":\"tr-TR\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/bilimvegelecek.com.tr\\\/index.php\\\/2012\\\/08\\\/01\\\/antik-yasama-evrilmek-icin-yeni-bir-sans-500-milyon-yillik-gen-gunumuz-organizmasina-yerlestirildi#webpage\"},\"isPartOf\":{\"@id\":\"https:\\\/\\\/bilimvegelecek.com.tr\\\/index.php\\\/2012\\\/08\\\/01\\\/antik-yasama-evrilmek-icin-yeni-bir-sans-500-milyon-yillik-gen-gunumuz-organizmasina-yerlestirildi#webpage\"},\"articleSection\":\"102. 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