A Burst of miRNA Innovation in the Early Evolution of Butterflies and Moths
Publication in refereed journal



摘要MicroRNAs (miRNAs) are involved in posttranscriptional regulation of gene expression. Because several miRNAs are known to affect the stability or translation of developmental regulatory genes, the origin of novel miRNAs may have contributed to the evolution of developmental processes and morphology. Lepidoptera (butterflies and moths) is a species-rich clade with a well-established phylogeny and abundant genomic resources, thereby representing an ideal system in which to study miRNA evolution. We sequenced small RNA libraries from developmental stages of two divergent lepidopterans, Cameraria ohridella (Horse chestnut Leafminer) and Pararge aegeria (Speckled Wood butterfly), discovering 90 and 81 conserved miRNAs, respectively, and many species-specific miRNA sequences. Mapping miRNAs onto the lepidopteran phylogeny reveals rapid miRNA turnover and an episode of miRNA fixation early in lepidopteran evolution, implying that miRNA acquisition accompanied the early radiation of the Lepidoptera. One lepidopteran-specific miRNA gene, miR-2768, is located within an intron of the homeobox gene invected, involved in insect segmental and wing patterning. We identified cubitus interruptus (ci) as a likely direct target of miR-2768, and validated this suppression using a luciferase assay system. We propose a model by which miR-2768 modulates expression of ci in the segmentation pathway and in patterning of lepidopteran wing primordia.
著者Quah S, Hui JHL, Holland PWH
期刊名稱Molecular Biology and Evolution
出版社Oxford University Press (OUP): Molecular Biology and Evolution
頁次1161 - 1174
關鍵詞Gli; homeobox; Lepidoptera; microRNA; segmentation; wing patterning
Web of Science 學科類別Biochemistry & Molecular Biology; Evolutionary Biology; Genetics & Heredity

上次更新時間 2021-16-01 於 23:35