Pozitif Seçilim Analizi, Böceklerde Yaşam Tarzına ve Soya Özgü Moleküler Evrimin İzlerini Ortaya Çıkarmaktadır
Böcekler, en çeşitli ve hızlı evrim geçiren organizmalar arasındadır ve bu, böceklerin neredeyse tüm ekosistemlere uyum sağlamalarına izin vermektedir. Başarılı bir adaptasyon, zorlu çevre koşullarının üstesinden gelmeyi gerektirir. Başarılı adaptasyonun altında yatan bilinen en iyi moleküler mekanizma pozitif seçilimdir. Bu mekanizma, yeni faydalı mutasyonlar kazanarak ve bu faydalı mutasyonları üreme yoluyla popülasyonlarda yeni nesillere aktararak türlerin lehine olmaktadır. Bu çalışmada 6 takım ve iki başkalaşım grubuna ait toplam 12 böcek türü kullanılmıştır. Bu böceklerde ve ortak atalarında adaptif pozitif seçilim toplam 535 bire bir tek kopya ortolog genlerin kodlayan dizileri kullanılarak incelenmiştir. En fazla pozitif seçilime maruz kalmış gen sayısı Onthaphagus taurus ve Dendroctanus ponderosae'de, en düşük pozitif seçilime uğramış gen sayısı ise bir homeopteran türü olan Acyrthosiphon pisum'da bulunmuştur. Soya dayalı analizlerde ise, en yüksek sayıda pozitif seçilime uğramış gen Lepidoptera ve Diptera takımlarının ortak atasında ve onları takiben Hymenoptera'yı Homoptera ve Isoptera takımlarının yakın zamandaki ortak atasından ayıran atada tespit edilmiştir. Sindirim, oksidatif indirgeme, transkripsiyon ve translasyon gibi temel biyolojik süreçte yer alan genler, pozitif olarak seçilen ortak genler arasındadır. Yaşam tarzı ve soya özgü genlerin pozitif seçilim altında olduğu bulunmuştur.
Analysis of Positive Selection Provides Insights into Lifestyle- and Lineage-Specific Patterns of Molecular Evolution in Insects
Insects are among the most divergent and most rapidly evolving species, which allow them to adapt to virtually all ecosystems. Successful adaptation requires overcome of challenging environmental conditions. The best-known molecular mechanism underlying successful adaptation is positive selection. This mechanism favors in species by gaining new beneficial mutations and transferring these beneficial mutations to new generations in populations via reproduction. In this study, a total of 12 insect species belonging to 6 orders and two morphogenesis groups were used to investigate positive adaptive selection in insects and their common ancestors using a total of 535 one-to-one single-copy ortholog genes. The highest number of the positively selected gene was found in Onthaphagus taurus and Dendroctanus ponderosae, and the lowest number of positively selected genes were found in a homopteran species, Acyrthosiphon pisum. The highest number of positively selected genes was detected in the common ancestor of the orders Lepidoptera and Diptera, followed by the node that separated Hymenoptera from a recent common ancestor of the orders Homoptera and Isoptera. Genes involved in the fundamental biological process digestion, oxidative reduction, transcription, and translation were among the core positively selected genes. Lifestyle and lineage-specific genes were found to be under positive selection.
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