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The expression status and integration of these short RNAs into ribosomes remains unclear and direct evidence for active ribosomes within apicomplexan mitochondria is still lacking. In this study, we conducted small RNA sequencing on the apicomplexan\n                    <jats:italic>Toxoplasma gondii<\/jats:italic>\n                    to investigate the occurrence and function of mitochondrial sRNAs. To enhance the analysis of sRNA sequencing outcomes, we also re-sequenced the\n                    <jats:italic>T. gondii<\/jats:italic>\n                    mitochondrial genome using an improved organelle enrichment protocol and Nanopore sequencing. It has been established previously that the\n                    <jats:italic>T. gondii<\/jats:italic>\n                    genome comprises 21 sequence blocks that undergo recombination among themselves but that their order is not entirely random. The enhanced coverage of the mitochondrial genome allowed us to characterize block combinations at increased resolution. Employing this refined genome for sRNA mapping, we find that many small RNAs originated from the junction sites between protein-coding blocks and rRNA sequence blocks. Surprisingly, such block border sRNAs were incorporated into polysomes together with canonical rRNA fragments and mRNAs. In conclusion, apicomplexan ribosomes are active within polysomes and are indeed assembled through the integration of sRNAs, including previously undetected sRNAs with merged mRNA-rRNA sequences. Our findings lead to the hypothesis that\n                    <jats:italic>T. gondii\u2019s<\/jats:italic>\n                    block-based genome organization enables the dual utilization of mitochondrial sequences as both messenger RNAs and ribosomal RNAs, potentially establishing a link between the regulation of rRNA and mRNA expression.\n                  <\/jats:p>","DOI":"10.7554\/elife.95407","type":"journal-article","created":{"date-parts":[[2024,2,16]],"date-time":"2024-02-16T08:05:05Z","timestamp":1708070705000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.95407","source":"Crossref","is-referenced-by-count":10,"title":["Small RNAs from mitochondrial genome recombination sites are incorporated into T. gondii 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