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- W2093663214 abstract "Because relatively little information is available about mtDNA in the euglenid protozoa, distant relatives of the kinetoplastid protozoa, we investigated mitochondrial genome structure and expression in Euglena gracilis. We found that isolated E. gracilis mtDNA comprises a heterodisperse collection of short molecules (modal size approximately 4 kbp) and that the mitochondrial large subunit (LSU) and small subunit (SSU) rRNAs are each split into two pieces. For the two halves of the SSU rRNA, we identified separate, non-contiguous coding modules that are flanked by a complex array of (primarily direct) A + T-rich repeats. The potential secondary structure of the bipartite SSU rRNA displays the expected conserved elements implicated in ribosome function. Label from [α-(32)P]GTP was incorporated in the presence of guanylyltransferase into each of the separate SSU and LSU rRNA fragments, confirming that these RNAs are primary transcripts, separately expressed from non-contiguous rRNA modules. In addition to authentic genes for SSU rRNA, we discovered numerous short fragments of protein-coding and rRNA genes dispersed throughout the E. gracilis mitochondrial genome. We propose that antisense transcripts of gene fragments of this type could have been the evolutionary precursors of the guide RNAs that mediate U insertion/deletion editing in the kinetoplastid relatives of the euglenids. To the extent that E. gracilis mtDNA is a representative euglenid mitochondrial genome, it differs radically in structure and organization from that of its kinetoplastid relatives, instead more closely resembling the mitochondrial genome of dinoflagellates in many of its features, an apparent evolutionary convergence." @default.
- W2093663214 created "2016-06-24" @default.
- W2093663214 creator A5042061779 @default.
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- W2093663214 date "2010-10-27" @default.
- W2093663214 modified "2023-10-16" @default.
- W2093663214 title "Ribosomal RNA genes in Euglena gracilis mitochondrial DNA: fragmented genes in a seemingly fragmented genome" @default.
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- W2093663214 doi "https://doi.org/10.1007/s00438-010-0585-9" @default.
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