Rapid Evolutionary Turnover Underlies Conserved LncRNA-genome Interactions

Overview

Journal Genes Dev

Specialty Molecular Biology

Date 2016 Jan 17

PMID 26773003

Citations 103

Authors

Jeffrey J Quinn

Qiangfeng C Zhang

Plamen Georgiev

Ibrahim A Ilik

Asifa Akhtar

Howard Y Chang

Affiliations

Soon will be listed here.

Abstract

Many long noncoding RNAs (lncRNAs) can regulate chromatin states, but the evolutionary origin and dynamics driving lncRNA-genome interactions are unclear. We adapted an integrative strategy that identifies lncRNA orthologs in different species despite limited sequence similarity, which is applicable to mammalian and insect lncRNAs. Analysis of the roX lncRNAs, which are essential for dosage compensation of the single X chromosome in Drosophila males, revealed 47 new roX orthologs in diverse Drosophilid species across ∼40 million years of evolution. Genetic rescue by roX orthologs and engineered synthetic lncRNAs showed that altering the number of focal, repetitive RNA structures determines roX ortholog function. Genomic occupancy maps of roX RNAs in four species revealed conserved targeting of X chromosome neighborhoods but rapid turnover of individual binding sites. Many new roX-binding sites evolved from DNA encoding a pre-existing RNA splicing signal, effectively linking dosage compensation to transcribed genes. Thus, dynamic change in lncRNAs and their genomic targets underlies conserved and essential lncRNA-genome interactions.

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