Precise annotation of Drosophila mitochondrial genomes leads to insights into AT-rich regions

Guangcai Liang, Dong Mi, Jia Chang, Tung On Yau, Guofeng Xu, Jishou Ruan, Wenjun Bu*, Shan Gao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In the present study, we performed precise annotation of Drosophila melanogaster, D. simulans, D. grimshawi, Bactrocera oleae mitochondrial (mt) genomes using pan RNA-seq analysis. Using PacBio cDNA-seq data from D. simulans, we precisely annotated the Transcription Initiation Sites (TISs) of the mt Heavy and Light strands in Drosophila mt genomes and reported that the polyA(+) and polyA(-) motifs in the CRs are associated with TISs. The discovery of the conserved polyA(+) and polyA(-) motifs provides insights into many polyA and polyT sequences in CRs of insect mt genomes, leading to reveal the mt transcription and its regulation in invertebrates. Notably, we propose that: (1) polyA/polyT motifs in CRs function as signals to initiate mtDNA transcription; (2) the duplication, recombination or mutation of these polyA/polyT sequences formed the AT-rich regions during evolution; and (3) since CRs of many invertebrate species still contain many polyA/polyT sequences, there is a high probability that several TISs and TTSs exist in invertebrate mt genomes.

Original languageEnglish
Pages (from-to)145-149
Number of pages5
JournalMitochondrion
Volume65
Early online date30 Jun 2022
DOIs
Publication statusPrint publication - Jul 2022

Bibliographical note

Copyright © 2022. Published by Elsevier B.V.

Keywords

  • Control region
  • Pan RNA-seq
  • TIS
  • TTS
  • Uninterrupted transcription

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