Yeni Keşfedilen Fonksiyonlarıyla Hareketli DNA Elemanları: Transpozonlar
Özet
Transpozonlar (hareketli DNA elemanları), insan genomunun yaklaşık %45-50'sini oluşturan ve yer değiştirebilen tekrarlayan genomik dizilerdir. Genel olarak retrotranspozonlar (Sınıf I) ve DNA transpozonları (Sınıf II) olarak iki ana sınıfa ayrılırlar. Gelişim sürecinde sıkı bir şekilde epigenetik mekanizmalarla susturulan bu elemanlar, kanserleşme sürecinde sessizliklerini kaybederek aktif hale gelebilmektedir. Son çalışmalar, transpozonların uzun kodlamayan RNA'ların (lncRNA) işlevsel domainlerinde yer alarak onların lokalizasyonunu, stabilitesini ve gen düzenleme kapasitelerini hem cis hem de trans düzeyde modüle ettiğini göstermektedir. Ayrıca transpozonlar, mikroRNA'ların (miRNA) kökeni ve hedef bölgeleri olarak işlev görerek housekeeping genlerin transkripsiyonel seviyelerini tamponlamaktadır. Telomer biyolojisinde, özellikle LINE-1 elemanlarının kanser hücrelerinde telomeraz aktivitesi ve telomer korunması için kritik bir rol oynadığı keşfedilmiştir. Genetik mühendisliğinde ise Uyuyan Güzel (SB) ve PiggyBac (PB) gibi DNA transpozon sistemleri, CRISPR/Cas9 ile birlikte kanser patogenezindeki kritik genleri tanımlamak amacıyla yaygın olarak kullanılmaktadır. Son olarak, aktif kalabilen Alu, L1 ve SVA gibi transpozon ailelerinin bireyler arasında ürettiği insersiyon polimorfizmleri, gen ekspresyon modellerini değiştirerek Crohn ve Sistemik Lupus Eritematozus gibi otoimmün ve inflamatuvar hastalıkların fenotipleriyle ilişkilendirilmektedir.
Transposons (transposable elements) are repetitive mobile genomic sequences that constitute approximately 45-50% of the human genome. They are divided into two main classes: retrotransposons (Class I) and DNA transposons (Class II). Strongly silenced by epigenetic mechanisms during normal development, these elements can lose their silencing and become transcriptionally active during carcinogenesis. Recent studies demonstrate that transposons reside within the functional domains of long non-coding RNAs (lncRNAs), modulating their localization, stability, and gene regulation capacity in both cis and trans manners. Additionally, transposons serve as sources and targets for microRNAs (miRNAs), buffering the transcriptional levels of housekeeping genes. In telomere biology, LINE-1 elements have been discovered to play a critical role in hTERT induction and telomere maintenance in tumor cells. In genetic engineering, DNA transposon systems like Sleeping Beauty and PiggyBac are widely utilized alongside CRISPR/Cas9 for insertional mutagenesis screens to identify crucial oncogenes and tumor suppressors. Furthermore, ongoing transposition of Alu, L1, and SVA families generates insertion polymorphisms among individuals, leading to regulatory variations associated with complex diseases such as Crohn's disease and Systemic Lupus Erythematosus.
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