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High throughput ANI analysis of 90K prokaryotic genomes reveals clear species boundaries
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Abstract
A fundamental question in microbiology is whether there is continuum of genetic diversity among genomes, or clear species boundaries prevail instead. Whole-genome similarity metrics such as Average Nucleotide Identity (ANI) help address this question by facilitating high resolution taxonomic analysis of thousands of genomes from diverse phylogenetic lineages. To scale to available genomes and beyond, we present FastANI, a new method to estimate ANI using alignment-free approximate sequence mapping. FastANI is accurate for both finished and draft genomes, and is up to three orders of magnitude faster compared to alignment-based approaches. We leverage FastANI to compute pairwise ANI values among all prokaryotic genomes available in the NCBI database. Our results reveal clear genetic discontinuity, with 99.8% of the total 8 billion genome pairs analyzed conforming to >95% intra-species and <83% inter-species ANI values. This discontinuity is manifested with or without the most frequently sequenced species, and is robust to historic additions in the genome databases.
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“FastANI (v1.3.1) (https://github.com/ParBLiSS/FastANI.) was used to calculate the average nucleotide identity between the isolated strains and the original Lp082,47 ensuring isolates were evolved from Lp082”
From Gut microbiota drives structural variation of exogenous probiotics to enhance colonization (2025) · cites this paper as [47]
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“The genome of M. subterranea is currently not available; however, comparison of the strain DH-2 genome to other Methanosarcina genomes with the FastANI tool (average nucleotide identity [ANI], a measure of nucleotide-level genomic similarity between the coding regions of two genomes) (21) showed that DH-2 is most simi…”
BackgroundMethodInfluentialMethane-derived carbon flows into host–virus networks at different trophic levels in soil
Lee, S., Sieradzki, E. T., Nicolas, A. M., Walker, R. L., Firestone, M. K., Hazard, C., & Nicol, G. W. (2021) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.2105124118 · Cited by 69
A genome catalogue of lake bacterial diversity and its drivers at continental scale
Garner, R. E., Kraemer, S. A., Onana, V. E., Fradette, M., Varin, M.-P., Huot, Y., & Walsh, D. A. (2023) · Nature Microbiology · doi:10.1038/s41564-023-01435-6 · Cited by 76
Li, X., Brejnrod, A., Thorsen, J., Zachariasen, T., Trivedi, U., Russel, J., Vestergaard, G., Stokholm, J., Rasmussen, M. A., & Sørensen, S. J. (2023) · Nature Communications · doi:10.1038/s41467-023-44289-6 · Cited by 73
Lin, X., Hu, T., Wu, Z., Li, L., Wang, Y., Wen, D., Liu, X., Li, W., Liang, H., Jin, X., et al. (2024) · iMeta · doi:10.1002/imt2.174 · Cited by 71
“32) [53] to compare the genomes for different data sets, and only one of the genomes was retained when the genomes were highly similar (pairwise ANI was 100”
BackgroundGenomic changes underlying host specialization in the bee gut symbiont Lactobacillus Firm5
Ellegaard, K., Brochet, S., Bonilla‐Rosso, G., Emery, O., Glover, N., Hadadi, N., Jaroň, K. S., van der Meer, J. R., Robinson‐Rechavi, M., Sentchilo, V., et al. (2019) · Molecular Ecology · doi:10.1111/mec.15075 · Cited by 70
Marine Dadabacteria exhibit genome streamlining and phototrophy-driven niche partitioning
Graham, E. D., & Tully, B. (2020) · The ISME Journal · doi:10.1038/s41396-020-00834-5 · Cited by 70
“Ecological distribution and environmental correlations For determining the ecological distribution and environmental correlations, a non-redundant set of MAGs was determined using FastANI (Jain et al., 2018) (v1.”
Re-evaluating the evidence for a universal genetic boundary among microbial species
Murray, C. S., Gao, Y., & Wu, M. (2021) · Nature Communications · doi:10.1038/s41467-021-24128-2 · Cited by 70
Waterworth, S. C., Flórez, L. V., Rees, E. R., Hertweck, C., Kaltenpoth, M., & Kwan, J. C. (2020) · mBio · doi:10.1128/mbio.02430-19 · Cited by 71
Chen, Y., Brook, T. C., Soe, C. Z., O’Neill, I. J., Alcon-Giner, C., Leelastwattanagul, O., Phillips, S., Caim, S., Clarke, P., Hall, L. J., et al. (2020) · Microbial Genomics · doi:10.1099/mgen.0.000377 · Cited by 68
Methanotrophy by a Mycobacterium species that dominates a cave microbial ecosystem
van Spanning, R. J. M., Guan, Q., Melkonian, C., Gallant, J., Polerecký, L., Flot, J., Brandt, B. W., Braster, M., Iturbe-Espinoza, P., Aerts, J. W., et al. (2022) · Nature Microbiology · doi:10.1038/s41564-022-01252-3 · Cited by 72
APPLES: Scalable Distance-Based Phylogenetic Placement with or without Alignments
Balaban, M., Sarmashghi, S., & Mirarab, S. (2019) · Systematic Biology · doi:10.1093/sysbio/syz063 · Cited by 69
Ye, L., Mei, R., Liu, W., Ren, H., & Zhang, X.-X. (2020) · Microbiome · doi:10.1186/s40168-020-0794-3 · Cited by 69
Lachance, M., Lee, D. K., & Hsiang, T. (2020) · Antonie van Leeuwenhoek · doi:10.1007/s10482-020-01480-9 · Cited by 68
“This is at considerable variance with the large gap (83–96% ANI) separating interspecific and intraspecific values in prokaryotes (Jain et al. 2018).”
BackgroundGounot, J.-S., Chia, M., Bertrand, D., Saw, W., Ravikrishnan, A., Low, A., Ding, Y., Ng, A. H. Q., Tan, L. W. L., Teo, Y., et al. (2022) · Nature Communications · doi:10.1038/s41467-022-33782-z · Cited by 66
Sex differences in the oral microbiome, host traits, and their causal relationships
Liu, X., Tong, X., Jie, Z., Zhu, J., Tian, L., Sun, Q., Ju, Y., Zou, L., Lu, H., Qiu, X., et al. (2022) · iScience · doi:10.1016/j.isci.2022.105839 · Cited by 68
Roberts, L. W., Harris, P. N. A., Forde, B. M., Zakour, N. L. B., Catchpoole, E. M., Stanton-Cook, M. J., Phan, M., Sidjabat, H. E., Bergh, H., Heney, C., et al. (2020) · Nature Communications · doi:10.1038/s41467-019-14139-5 · Cited by 66
Reply to: “Re-evaluating the evidence for a universal genetic boundary among microbial species”
Rodriguez‐R, L. M., Jain, C., Conrad, R. E., Aluru, S., & Konstantinidis, K. T. (2021) · Nature Communications · doi:10.1038/s41467-021-24129-1 · Cited by 68
Self-citationA Genome-Based Species Taxonomy of the Lactobacillus Genus Complex
Wittouck, S., Wuyts, S., Meehan, C. J., van Noort, V., & Lebeer, S. (2019) · mSystems · doi:10.1128/msystems.00264-19 · Cited by 73
Diversity and evolution of surface polysaccharide synthesis loci in Enterobacteriales
Holt, K. E., Lassalle, F., Wyres, K. L., Wick, R. R., & Mostowy, R. J. (2020) · The ISME Journal · doi:10.1038/s41396-020-0628-0 · Cited by 61
Bernardy, E. E., Petit, R. A., Raghuram, V., Alexander, A. M., Read, T. D., & Goldberg, J. B. (2020) · mBio · doi:10.1128/mbio.00735-20 · Cited by 69
Arikawa, K., Ide, K., Kogawa, M., Saeki, T., Yoda, T., Endoh, T., Matsuhashi, A., Takeyama, H., & Hosokawa, M. (2021) · Microbiome · doi:10.1186/s40168-021-01152-4 · Cited by 72
“ANI was calculated for selected SAGs using FastANI 1.3 [42].”
MethodInfluentialFang, Y., Liu, J., Yang, J., Wu, G., Hua, Z., Dong, H., Hedlund, B. P., Baker, B. J., & Jiang, H. (2022) · mSystems · doi:10.1128/msystems.00335-22 · Cited by 67
“Average nucleotide identity (ANI) analysis demonstrated that each MAG represented a unique species based on the species demarcation threshold of 95% (24).”
BackgroundAchtman, M., Zhou, Z., Charlesworth, J., & Baxter, L. A. (2022) · Philosophical Transactions of the Royal Society B Biological Sciences · doi:10.1098/rstb.2021.0240 · Cited by 70
“Fast 71 computational methods based on k-mer searches, such as FastANI [10], can perform 72 ANI-like calculations on large numbers of genomes, and these calculations are now 73 routinely used by bioinformaticians for taxonomic assignments.”
MethodInfluentialNatural products from reconstructed bacterial genomes of the Middle and Upper Paleolithic
Klapper, M., Hübner, A., Ibrahim, A., Wasmuth, I., Borry, M., Haensch, V. G., Zhang, S., Al‐Jammal, W. K., Suma, H. R., Yates, J. A. F., et al. (2023) · Science · doi:10.1126/science.adf5300 · Cited by 67
Lactococcus lactis in Dairy Fermentation—Health-Promoting and Probiotic Properties
Kondrotienė, K., Zavistanavičiūtė, P., Aksomaitienė, J., Novoslavskij, A., & Malakauskas, M. (2023) · Fermentation · doi:10.3390/fermentation10010016 · Cited by 83
“The integration of a variety of tools, e.g., FastANI [377], mobileOG-db [378], CRISPR/Cas Finder, pLannotate [379], and CGView Builder [380], and their associated visualization capabilities facilitates the identification of genome elements of interest.”
MethodGut microbiota contributes to high-altitude hypoxia acclimatization of human populations
Su, Q., Zhuang, D., Li, Y., Chen, Y., Wang, X.-Y., Ge, M., Xue, T.-Y., Zhang, Q.-Y., Liu, X., Yin, F.-Q., et al. (2024) · Genome biology · doi:10.1186/s13059-024-03373-w · Cited by 73
“According to the 95% average nucleotide identity (ANI) threshold [13], a non-redundant genome set consisting of 4312 species-level genome bins (SGBs) was constructed based on these data and a previously published human microbial genome [14].”
MethodAnderson, C. L., & Fernando, S. C. (2021) · Communications Biology · doi:10.1038/s42003-021-02331-7 · Cited by 66
Diesel and Crude Oil Biodegradation by Cold-Adapted Microbial Communities in the Labrador Sea
Murphy, S., Bautista, M. A., Cramm, M. A., & Hubert, C. R. J. (2021) · Applied and Environmental Microbiology · doi:10.1128/aem.00800-21 · Cited by 75
“FastANI (118), with minimum fragment length set to 1,000 bp and other parameters set to default, was used to compare the percent average nucleotide identity (ANI) of select MAGs and published genomes.”
MethodHarrison, J., Nelson, K., Morcrette, H., Morcrette, C. J., Preston, J., Helmer, L., Titball, R. W., Butler, C. S., & Wagley, S. (2021) · Water Research · doi:10.1016/j.watres.2021.117942 · Cited by 69
Active anaerobic methane oxidation and sulfur disproportionation in the deep terrestrial subsurface
Bell, E., Lamminmäki, T., Alneberg, J., Chen, Q., Xiong, W., Hettich, R. L., Frutschi, M., & Bernier‐Latmani, R. (2022) · The ISME Journal · doi:10.1038/s41396-022-01207-w · Cited by 66
Hu, X., Gu, H., Liu, J., Wei, D., Zhu, P., Cui, X., Zhou, B., Chen, X., Jin, J., Liu, X., et al. (2023) · Agriculture Ecosystems & Environment · doi:10.1016/j.agee.2023.108462 · Cited by 66
Savin, C., Criscuolo, A., Guglielmini, J., Guern, A. L., Carniel, É., Pizarro‐Cerdá, J., & Brisse, S. (2019) · Microbial Genomics · doi:10.1099/mgen.0.000301 · Cited by 65
Methylobacterium ajmalii sp. nov., Isolated From the International Space Station
Bijlani, S., Singh, N. K., Eedara, V. V. R., Podile, A. R., Mason, C. E., Wang, C. C. C., & Venkateswaran, K. J. (2021) · Frontiers in Microbiology · doi:10.3389/fmicb.2021.639396 · Cited by 65
“Genomes of all other strains used in this study were downloaded from NCBI, and the genomic relatedness of ISS strains was identified based on average nucleotide identity (ANI; FastANI) calculations (Jain et al., 2018) and digital DNA-DNA hybridization (dDDH) analysis (Meier-Kolthoff et al., 2013).”
MethodMestre, M. R., Gao, L. A., Shah, S. A., López-Beltrán, A., González-Delgado, A., Martínez‐Abarca, F., Iranzo, J., Redrejo‐Rodríguez, M., Zhang, F., & Toro, N. (2022) · Nucleic Acids Research · doi:10.1093/nar/gkac467 · Cited by 65
Maire, J., Tandon, K., Collingro, A., van de Meene, A., Damjanovic, K., Gøtze, C. R., Stephenson, S., Philip, G. K., Horn, M., Cantin, N. E., et al. (2023) · Science Advances · doi:10.1126/sciadv.adg0773 · Cited by 64
Dyksma, S., & Pester, M. (2024) · Microbiome · doi:10.1186/s40168-024-01909-7 · Cited by 72
“Average nucleotide identities (ANI) between these high-quality, nearly complete genomes ranged between 82.2% and 86.6%, which is below the intra-species cut-off of 95% [57] and suggests that these MAGs represent individual species.”
BackgroundInfluentialLiu, Y., Pei, T., Du, J., Huang, H.-R., Deng, M., & Zhu, H. (2021) · Systematic and Applied Microbiology · doi:10.1016/j.syapm.2021.126202 · Cited by 64
Opposite Sides of Pantoea agglomerans and Its Associated Commercial Outlook
Lorenzi, A. S., Bonatelli, M. L., Chia, M. A., Peressim, L., & Quecine, M. C. (2022) · Microorganisms · doi:10.3390/microorganisms10102072 · Cited by 65
Metadata
- Authors
- Jain, C., Rodriguez-R, L. M., Phillippy, A. M., Konstantinidis, K. T., & Aluru, S.
- Affiliations
- National Institutes of Health (US)
- Georgia Institute of Technology (US)
- Corresponding author
- Konstantinidis, Konstantinos T.
- Aluru, Srinivas
- ORCID
- Venue
- Nature Communications
- Published
- 2018-11-30
- Volume
- 9
- Issue
- 1
- Pages
- 5114-5114
- ISSN
- 2041-1723 (ISSN-L)
- PMC
- PMC6269478
- OpenAlex
- W2951254987
- Cited by
- 5,748
- References
- 40
- Citations by year
- 2026: 1107 · 2025: 1110 · 2024: 977 · 2023: 789 · 2022: 695 · 2021: 617 · 2020: 305 · 2019: 128 · 2018: 16
- FWCI
- 96.11
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Nature Communications (publishedVersion, cc-by)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, other-oa)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- National Science Foundation (1416259, 1816027, 1356288)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
- Health Sciences › Medicine › Microbiology (medical) › Bacterial Identification and Susceptibility Testing
- Physical Sciences › Environmental Science › Ecology › Microbial Community Ecology and Physiology
- Keywords
- average nucleotide identity, prokaryotic genomes, species boundaries, taxonomic classification, draft genome sequence
- MeSH terms
- Phylogeny, Prokaryotic Cells, Genetic Variation, Databases, Factual, Genome, Bacterial, Sequence Analysis, DNA
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