{"id":22200,"date":"2018-03-23T00:05:00","date_gmt":"2018-03-22T21:05:00","guid":{"rendered":"https:\/\/bilimvegelecek.com.tr\/?p=22200"},"modified":"2018-03-22T22:45:30","modified_gmt":"2018-03-22T19:45:30","slug":"olumsuzluk-enzimi-telomerazin-gizli-sirri-aciga-cikarildi","status":"publish","type":"post","link":"https:\/\/bilimvegelecek.com.tr\/index.php\/2018\/03\/23\/olumsuzluk-enzimi-telomerazin-gizli-sirri-aciga-cikarildi","title":{"rendered":"\u00d6l\u00fcms\u00fczl\u00fck enzimi telomeraz\u0131n gizli s\u0131rr\u0131 a\u00e7\u0131\u011fa \u00e7\u0131kar\u0131ld\u0131!"},"content":{"rendered":"<p>Sonsuza kadar gen\u00e7 kalabilir miyiz, ya da kaybetti\u011fimiz gen\u00e7li\u011fi yeniden kazanabilir miyiz?<\/p>\n<p>Yeni bir ara\u015ft\u0131rma telomeraz enziminin katalitik d\u00f6ng\u00fcs\u00fcnde \u00f6nemli bir ad\u0131m\u0131 ortaya \u00e7\u0131karm\u0131\u015ft\u0131r. Bu katalitik d\u00f6ng\u00fc, insan telomeraz enziminin DNA sentezleme yetene\u011fini belirler.<\/p>\n<p>Arizona Devlet \u00dcniversitesi\u2019ndeki Molek\u00fcler Bilimler Okulu\u2019ndan Prof. Julian Chen\u2019in laboratuvar\u0131nda yap\u0131lan yeni bir ara\u015ft\u0131rma, telomeraz enzimi katalitik d\u00f6ng\u00fcs\u00fcnde \u00f6nemli bir a\u015famay\u0131 ortaya \u00e7\u0131kard\u0131. Bu katalitik d\u00f6ng\u00fc, insan telomeraz enziminin, DNA \u201ctekrarlar\u0131n\u0131\u201d (alt\u0131 n\u00fckleotidin spesifik DNA par\u00e7as\u0131n\u0131) kromozom u\u00e7lar\u0131na sentezleme kabiliyetini belirler ve b\u00f6ylece h\u00fccrelerdeki \u00f6l\u00fcms\u00fczl\u00fc\u011f\u00fc sa\u011flar. Telomeraz hareketinin alt\u0131nda yatan mekanizmay\u0131 anlamak, etkili ya\u015flanma kar\u015f\u0131t\u0131 tedaviler i\u00e7in yeni yollar sunacakt\u0131r.<\/p>\n<p>Tipik insan h\u00fccreleri \u00f6l\u00fcml\u00fcd\u00fcr ve sonsuza kadar kendilerini yenileyemez. Leonard Hayflick\u2019in yar\u0131m as\u0131r \u00f6nce g\u00f6sterdi\u011fi gibi, insan h\u00fccreleri s\u0131n\u0131rl\u0131 bir replikasyon \u00f6mr\u00fcne sahiptir ve ya\u015fl\u0131 h\u00fccreler bu s\u0131n\u0131ra gen\u00e7 h\u00fccrelerden daha \u00e7abuk ula\u015f\u0131r. H\u00fccresel \u00f6mr\u00fcn bu \u201cHayflick s\u0131n\u0131r\u0131\u201d genetik materyal ta\u015f\u0131yan kromozomlar\u0131n u\u00e7lar\u0131nda bulunan benzersiz DNA tekrarlar\u0131n\u0131n say\u0131s\u0131 ile do\u011frudan ili\u015fkilidir. Bu DNA tekrarlar\u0131, kromozomlar\u0131n u\u00e7lar\u0131n\u0131, genomu destabilize eden istenmeyen ve yersiz DNA d\u00fczenlemelerinden koruyan \u201ctelomer\u201d olarak adland\u0131r\u0131lan koruyucu ba\u015fl\u0131k yap\u0131lar\u0131n\u0131n bir par\u00e7as\u0131d\u0131r.<\/p>\n<p>H\u00fccre her b\u00f6l\u00fcnd\u00fc\u011f\u00fc zaman, telomerik DNA k\u0131sal\u0131r ve sonu\u00e7ta kromozom u\u00e7lar\u0131n\u0131 sabit kalmaz. Telomer uzunlu\u011funun bu s\u00fcrekli k\u0131salmas\u0131, h\u00fccre b\u00fcy\u00fcmesinin sonuna kadar uzanan bir \u201cmolek\u00fcler saat\u201d olarak i\u015flev g\u00f6r\u00fcr. H\u00fccrelerin b\u00fcy\u00fcme yetene\u011finin azalmas\u0131, zay\u0131fl\u0131k, hastal\u0131k ve organ yetmezli\u011fine do\u011frudan katk\u0131da bulunan azalm\u0131\u015f h\u00fccre pop\u00fclasyonu ve ya\u015flanma s\u00fcreciyle g\u00fc\u00e7l\u00fc bir \u015fekilde ili\u015fkilidir.<\/p>\n<p><strong>Molek\u00fcler d\u00fczeyde gen\u00e7lik \u00e7e\u015fmesi<\/strong><\/p>\n<p>Telomerin k\u0131salmas\u0131 i\u015flemine kar\u015f\u0131 koymak, h\u00fccresel ya\u015flanma s\u00fcrecini geciktirmek ve hatta tersine \u00e7evirmek i\u00e7in anahtar\u0131 elinde tutan enzim ise telomerazd\u0131r. Telomeraz, telomerleri uzatarak h\u00fccresel ya\u015flanmay\u0131 dengeler; kaybedilen DNA tekrarlar\u0131n\u0131 yeniden ekleyerek, molek\u00fcler saatteki gerisay\u0131ma zaman kazand\u0131r\u0131r ve bu \u015fekilde h\u00fccrenin \u00f6mr\u00fcn\u00fc etkili bir \u015fekilde uzat\u0131r. Telomeraz, enzimin kendisinde bulunan bir RNA \u015fablonunun kromozom u\u00e7lar\u0131ndaki \u00a0\u201cGGTTAG\u201d dizilimiyle, DNA\u2019n\u0131n yap\u0131ta\u015f\u0131 olan alt\u0131 n\u00fckleotidden olu\u015fan \u00e7ok k\u0131sa DNA tekrar\u0131n\u0131 yeniden sentezleyerek telomerleri uzat\u0131r. Bununla birlikte, telomeraz enziminin aktivitesi, kay\u0131p telomerik DNA tekrarlar\u0131n\u0131 tamamen geri y\u00fcklemek ya da h\u00fccresel ya\u015flanmay\u0131 durdurmak i\u00e7in yetersizdir.<\/p>\n<p>Telomerlerin kademeli olarak k\u0131salmas\u0131, hasarl\u0131 dokular\u0131 onaran h\u00fccreler ve\/veya v\u00fccudumuzdaki ya\u015flanan organlar\u0131 yenileyen insan yeti\u015fkin k\u00f6k h\u00fccrelerinin \u00e7o\u011falma kapasitesini etkilemektedir. Telomeraz\u0131n yeti\u015fkin k\u00f6k h\u00fccrelerindeki aktivitesi sadece molek\u00fcler saatin gerisay\u0131m\u0131n\u0131 yava\u015flat\u0131r ve bu h\u00fccreleri tamamen \u00f6l\u00fcms\u00fczle\u015ftirmez. Bu nedenle yeti\u015fkin k\u00f6k h\u00fccreler, telomer k\u0131salmas\u0131 nedeniyle ya\u015fl\u0131 bireylerde t\u00fckenir, bu da iyile\u015fme s\u00fcrelerinin uzamas\u0131na ve h\u00fccre pop\u00fclasyonlar\u0131n\u0131n yetersiz kalmas\u0131ndan kaynaklanan organ dokular\u0131ndaki bozulmalara neden olur.<\/p>\n<p><strong>Telomeraz\u0131n t\u00fcm potansiyeline dokunmak<\/strong><\/p>\n<p>Telomeraz enziminin d\u00fczenlenmesinin ve s\u0131n\u0131rland\u0131r\u0131lmas\u0131n\u0131n anla\u015f\u0131lmas\u0131, telomer k\u0131salmas\u0131n\u0131 ve h\u00fccresel ya\u015flanmay\u0131 tersine \u00e7evirerek insan \u00f6mr\u00fcn\u00fc uzatma ve ya\u015fl\u0131 bireylerin sa\u011fl\u0131\u011f\u0131n\u0131 iyile\u015ftirme potansiyeline sahiptir. Chen Laboratuvar\u0131\u2019n\u0131n ara\u015ft\u0131rmas\u0131nda, Yinnan Chen, Joshua Podlevsky ve Dhenugen Logeswaran\u2019\u0131n \u00e7al\u0131\u015fmalar\u0131yla, kromozom u\u00e7lar\u0131ndaki DNA tekrarlar\u0131n\u0131n telomerik sentezi i\u00e7in telomeraz\u0131n beceresini s\u0131n\u0131rlayan katalitik d\u00f6ng\u00fcdeki \u00f6nemli bir ad\u0131m ortaya \u00e7\u0131kar\u0131ld\u0131.<\/p>\n<p>Prof. Chen, \u201cTelomeraz\u0131n do\u011fru telomerik DNA tekrarlar\u0131n\u0131n tam sentezini sa\u011flamak i\u00e7in yerle\u015fik bir fren sistemi vard\u0131r. Bu emniyetli fren de telomeraz enziminin genel aktivitesini s\u0131n\u0131rl\u0131yor. Telomeraz enzimi \u00fczerindeki frenleri d\u00fczg\u00fcn bir \u015fekilde serbest b\u0131rakman\u0131n bir yolunu bulmak, yeti\u015fkin k\u00f6k h\u00fccrelerinin kay\u0131p telomer uzunlu\u011funu geri y\u00fckleme ve hatta h\u00fccresel ya\u015flanmay\u0131 tersine \u00e7evirme potansiyeline sahiptir\u201d diyor.<\/p>\n<p>Telomeraz\u0131n bu i\u00e7sel freni, enzimin, \u201cGGTTAG\u201d dizisinin sonundaki DNA sentezini durdurmas\u0131 i\u00e7in, telomeraz\u0131n kendi RNA \u015fablonunda kodlanm\u0131\u015f bir duraklama sinyalini i\u015faret ediyor. Telomeraz bir sonraki DNA tekrar\u0131 i\u00e7in DNA sentezini yeniden ba\u015flatt\u0131\u011f\u0131nda, bu duraklama sinyali h\u00e2l\u00e2 aktiftir ve DNA sentezini s\u0131n\u0131rlar. \u00d6zellikle, DNA tekrar sentezinin yeniden ba\u015flat\u0131lmas\u0131n\u0131 \u00f6nleyen duraklama sinyali hedeflenirse, telomeraz enzimatik fonksiyonu, telomer uzunlu\u011funun k\u0131salt\u0131lmas\u0131n\u0131n daha iyi bertaraf\u0131yla, ya\u015flanan insan yeti\u015fkin k\u00f6k h\u00fccrelerini canland\u0131rma potansiyelini g\u00fc\u00e7lendirebilir.<\/p>\n<p>Diskeratozis congenita, aplastik anemi ve idiyopatik pulmoner fibroz i\u00e7eren insan hastal\u0131klar\u0131, genetik olarak, telomeraz aktivitesini olumsuz y\u00f6nde etkileyen ve\/veya telomer uzunlu\u011funun kayb\u0131n\u0131 h\u0131zland\u0131ran mutasyonlara ba\u011flanm\u0131\u015ft\u0131r. Bu h\u0131zlanan telomer k\u0131salmas\u0131, artm\u0131\u015f organ bozulmas\u0131yla erken ya\u015flanmaya ve kritik derecede yetersiz h\u00fccre pop\u00fclasyonlar\u0131n\u0131n hasta \u00f6mr\u00fcn\u00fc k\u0131saltmas\u0131na \u00e7ok benzer. Telomeraz aktivitesinin artt\u0131r\u0131lmas\u0131, bu hastal\u0131klar\u0131n tedavisinde g\u00f6r\u00fcn\u00fc\u015fte en umut verici ara\u00e7t\u0131r.<\/p>\n<p>Telomeraz aktivitesinin artmas\u0131, ya\u015flanan h\u00fccrelere gen\u00e7li\u011fi verebilir ve erken ya\u015flanma benzeri hastal\u0131klar\u0131n tedavisini sa\u011flayabilir; ama bu iyi aktivitenin \u00e7ok fazlas\u0131 da bireye zarar verebilir. Gen\u00e7 k\u00f6k h\u00fccreler telomer uzunlu\u011fu kayb\u0131n\u0131 telafi etmek i\u00e7in telomeraz\u0131 kullan\u0131rken, kanser h\u00fccreleri de anormal ve tahrip edici b\u00fcy\u00fcmelerini s\u00fcrd\u00fcrmek i\u00e7in telomeraz\u0131 kullanmaktad\u0131r. Telomeraz i\u015flevinin artt\u0131r\u0131lmas\u0131 ve d\u00fczenlenmesi, h\u00fccre yenilenmesi ile kanser geli\u015fimi i\u00e7in y\u00fcksek bir risk aras\u0131nda dar bir \u00e7izgide y\u00fcr\u00fcnmesi gereken, hassas bir uygulamad\u0131r.<\/p>\n<p>\u0130nsan k\u00f6k h\u00fccrelerinden farkl\u0131 olarak, somatik h\u00fccreler insan v\u00fccudundaki h\u00fccrelerin b\u00fcy\u00fck \u00e7o\u011funlu\u011funu olu\u015fturur ve telomeraz aktivitesinden yoksundurlar. \u0130nsan somatik h\u00fccrelerinin telomeraz eksikli\u011fi, telomeraz kontrols\u00fcz kanser h\u00fccresi b\u00fcy\u00fcmesini tetikledi\u011fi i\u00e7in kanser geli\u015fim riskini azalt\u0131r. Bu nedenle, t\u00fcm h\u00fccre tiplerinde telomeraz aktivitesini ayr\u0131m g\u00f6zetmeden art\u0131racak ila\u00e7lar arzu edilmez. Yeni ke\u015fif, telomeraz katalitik d\u00f6ng\u00fcs\u00fc a\u00e7\u0131s\u0131ndan \u00f6nemli bir yeni ila\u00e7 hedefi ortaya koymaktad\u0131r. K\u00fc\u00e7\u00fck molek\u00fcll\u00fc ila\u00e7lar, kanser riskini artt\u0131rmadan ya\u015flanma kar\u015f\u0131t\u0131 tedavilerin yap\u0131labilmesinin yan\u0131 s\u0131ra, hastal\u0131k tedavisi i\u00e7in sadece k\u00f6k h\u00fccreler i\u00e7inde telomeraz etkinli\u011fini art\u0131rmak i\u00e7in tasarlanabilir.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sonsuza kadar gen\u00e7 kalabilir miyiz, ya da kaybetti\u011fimiz gen\u00e7li\u011fi yeniden kazanabilir miyiz? Yeni bir ara\u015ft\u0131rma telomeraz enziminin katalitik d\u00f6ng\u00fcs\u00fcnde \u00f6nemli bir ad\u0131m\u0131 ortaya \u00e7\u0131karm\u0131\u015ft\u0131r. Bu katalitik d\u00f6ng\u00fc, insan telomeraz enziminin DNA sentezleme yetene\u011fini belirler. Arizona Devlet \u00dcniversitesi\u2019ndeki Molek\u00fcler Bilimler Okulu\u2019ndan Prof. Julian Chen\u2019in laboratuvar\u0131nda yap\u0131lan yeni bir ara\u015ft\u0131rma, telomeraz enzimi katalitik d\u00f6ng\u00fcs\u00fcnde \u00f6nemli bir a\u015famay\u0131 [&hellip;]<\/p>\n","protected":false},"author":871,"featured_media":22201,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19,21,231],"tags":[272,2696,1766,2697],"class_list":["post-22200","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bilim-gundemi","category-biyoloji","category-molekuler-biyoloji-ve-genetik","tag-dna","tag-enzimler","tag-genclik","tag-telomeraz"],"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=\"Sedef 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