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Organelles in the ointment: improved detection of cryptic mitochondrial reads resolves many unknown sequences in cross-species microbiome analyses

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Názov: Organelles in the ointment: improved detection of cryptic mitochondrial reads resolves many unknown sequences in cross-species microbiome analyses
Autori: Sonett, Dylan, Brown, Tanya, Bengtsson Palme, Johan, 1985, Padilla-Gamino, Jacqueline L., Zaneveld, Jesse R.
Zdroj: Isme Communications. 4(1)
Predmety: animal microbiomes, mitochondria, mitochondrial diversity, microbiome analysis, amplicon sequencing
Popis: The genomes of mitochondria and chloroplasts contain ribosomal RNA (rRNA) genes, reflecting their ancestry as free-living bacteria. These organellar rRNAs are often amplified in microbiome studies of animals and plants. If identified, they can be discarded, merely reducing sequencing depth. However, we identify certain high-abundance organeller RNAs not identified by common pipelines, which may compromise statistical analysis of microbiome structure and diversity. We quantified this by reanalyzing 7459 samples from seven 16S rRNA studies, including microbiomes from 927 unique animal genera. We find that under-annotation of cryptic mitochondrial and chloroplast reads affects multiple of these large-scale cross-species microbiome comparisons, and varies between host species, biasing comparisons. We offer a straightforward solution: supplementing existing taxonomies with diverse organelle rRNA sequences. This resolves up to 97% of unique unclassified sequences in some entire studies as mitochondrial (14% averaged across all studies), without increasing false positive annotations in mitochondria-free mock communities. Improved annotation decreases the proportion of unknown sequences by >= 10-fold in 2262 of 7459 samples (30%), spanning five of seven major studies examined. We recommend leveraging organelle sequence diversity to better identify organelle gene sequences in microbiome studies, and provide code, data resources and tutorials that implement this approach.
Popis súboru: electronic
Prístupová URL adresa: https://research.chalmers.se/publication/544398
https://research.chalmers.se/publication/544398/file/544398_Fulltext.pdf
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  Data: Organelles in the ointment: improved detection of cryptic mitochondrial reads resolves many unknown sequences in cross-species microbiome analyses
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  Data: <searchLink fieldCode="AR" term="%22Sonett%2C+Dylan%22">Sonett, Dylan</searchLink><br /><searchLink fieldCode="AR" term="%22Brown%2C+Tanya%22">Brown, Tanya</searchLink><br /><searchLink fieldCode="AR" term="%22Bengtsson+Palme%2C+Johan%22">Bengtsson Palme, Johan</searchLink>, 1985<br /><searchLink fieldCode="AR" term="%22Padilla-Gamino%2C+Jacqueline+L%2E%22">Padilla-Gamino, Jacqueline L.</searchLink><br /><searchLink fieldCode="AR" term="%22Zaneveld%2C+Jesse+R%2E%22">Zaneveld, Jesse R.</searchLink>
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  Data: <i>Isme Communications</i>. 4(1)
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  Data: <searchLink fieldCode="DE" term="%22animal+microbiomes%22">animal microbiomes</searchLink><br /><searchLink fieldCode="DE" term="%22mitochondria%22">mitochondria</searchLink><br /><searchLink fieldCode="DE" term="%22mitochondrial+diversity%22">mitochondrial diversity</searchLink><br /><searchLink fieldCode="DE" term="%22microbiome+analysis%22">microbiome analysis</searchLink><br /><searchLink fieldCode="DE" term="%22amplicon+sequencing%22">amplicon sequencing</searchLink>
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  Label: Description
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  Data: The genomes of mitochondria and chloroplasts contain ribosomal RNA (rRNA) genes, reflecting their ancestry as free-living bacteria. These organellar rRNAs are often amplified in microbiome studies of animals and plants. If identified, they can be discarded, merely reducing sequencing depth. However, we identify certain high-abundance organeller RNAs not identified by common pipelines, which may compromise statistical analysis of microbiome structure and diversity. We quantified this by reanalyzing 7459 samples from seven 16S rRNA studies, including microbiomes from 927 unique animal genera. We find that under-annotation of cryptic mitochondrial and chloroplast reads affects multiple of these large-scale cross-species microbiome comparisons, and varies between host species, biasing comparisons. We offer a straightforward solution: supplementing existing taxonomies with diverse organelle rRNA sequences. This resolves up to 97% of unique unclassified sequences in some entire studies as mitochondrial (14% averaged across all studies), without increasing false positive annotations in mitochondria-free mock communities. Improved annotation decreases the proportion of unknown sequences by >= 10-fold in 2262 of 7459 samples (30%), spanning five of seven major studies examined. We recommend leveraging organelle sequence diversity to better identify organelle gene sequences in microbiome studies, and provide code, data resources and tutorials that implement this approach.
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        Value: 10.1093/ismeco/ycae114
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              Y: 2024
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