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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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“…and generated whole genome phylogenies using BacSort [default parameters] (https:// github. com/ rrwick/ Bacso rt) with the combined FastANI [111] and Mash [112] approach to generate a distance matrix and tree for visualization with phyloXML [113] and Archae-opteryx (https:// www. phylo…”
MethodGenomic delineation and description of species and within-species lineages in the genus Pantoea
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“…genome sequence comparisons currently allow us to easily assign bacteria to species based on average nucleotide identity (ANI), whereby 95% ANI is the generally agreed-upon guideline for the delineation of bacteria belonging to the same species (Konstantinidis and Tiedje, 2005; Jain et al., 2018).”
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“The ANI and AF were calculated with FastANI ( v 1.33) [29], using the protocol adapted from Kauffman et al. [30] to meet the MIUViG standards.”
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“32 71 using the default parameters.”
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“Species were 120 identified by Kraken and by performing pairwise comparisons of average nucleotide identity on 121 the assembled genomes using fastANI using the many-to-many method (25).”
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“%) for species identification (Jain et al., 2018), and we propose the names “Candidatus Nitrosocaldus tengchongensis” sp. nov. and “Candidatus Nitrosocaldus schleperae” sp. nov. for clade B and clade D, respectively.”
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“The wholegenome similarity metrics of ANI was recently improved to increase its resolution in taxonomy (Jain et al. 2018).”
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“Whole-genome sequencing (WGS) data have been used for species identification using k-mer based methods [21,24,25].”
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“FastANI chops the two genomes into pieces and aligns them against each other for speedup.”
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“This method suggests firm resolution amidst closely linked genomes (80–100% ANI) [61].”
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“The similarity analysis was performed using all the complete genomes as input to the software FastANI [21], using default parameters.”
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“ANI was calculated using FastANI.(68) For the more extensive pangenomic analysis in Figure S1, the genomes of V.”
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“Those reference genomes were combined with our assembled draft genomes and compared in an all-vs-all manner using FastANI to calculate ANI between each pair of isolates (77).”
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“ANI was estimated with fastANI [36].”
Seng, R., Chomkatekaew, C., Tandhavanant, S., Saiprom, N., Phunpang, R., Thaipadungpanit, J., Batty, E. M., Day, N., Chantratita, W., West, T. E., et al. (2024) · Nature Communications · doi:10.1038/s41467-024-50067-9 · Cited by 31
Nooij, S., Plomp, N., Sanders, I. M. J. G., Schout, L., van der Meulen, A. E., Terveer, E. M., Norman, J. M., Karcher, N., Larralde, M., Vossen, R. H. A. M., et al. (2025) · Nature Communications · doi:10.1038/s41467-025-56449-x · Cited by 35
“As all R. gnavus genomes included here share at least 95% similarity with one another, which is often considered the species boundary 25,26 , we consider that these clades represent sub-species.”
InfluentialAutoMLST2: a web server for phylogeny and microbial taxonomy
Pourmohsenin, B., Wiese, A., & Ziemert, N. (2025) · Nucleic Acids Research · doi:10.1093/nar/gkaf397 · Cited by 31
“Advances in whole-genome sequencing and computational methods have enabled more robust approaches, such as Average Nucleotide Identity (ANI) analysis and Multi-Locus Sequence Analysis (MLSA) [ 5–7 ].”
InfluentialBacterial microcompartments and energy metabolism drive gut colonization by Bilophila wadsworthia
Sayavedra, L., Yasir, M., Goldson, A. J., Brion, A., Gall, G. L., Moreno‐Gonzalez, M., Altera, A., Paxhia, M. D., Warren, M. J., Savva, G. M., et al. (2025) · Nature Communications · doi:10.1038/s41467-025-60180-y · Cited by 33
“ANI values were calculated using fastANI (v.1.3.4) 82 .”
InfluentialPutative novel cps loci in a large global collection of pneumococci
van Tonder, A. J., Gladstone, R. A., Lo, S. W., Nahm, M. H., du Plessis, M., Cornick, J., Kwambana-Adams, B., Madhi, S. A., Hawkins, P. A., Benisty, R., et al. (2019) · Microbial Genomics · doi:10.1099/mgen.0.000274 · Cited by 31
Azospirillum palustre sp. nov., a methylotrophic nitrogen-fixing species isolated from raised bog
Tikhonova, E. N., Grouzdev, D. S., & Kravchenko, I. K. (2019) · INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY · doi:10.1099/ijsem.0.003560 · Cited by 31
Buse, H. Y., Morris, B. J., Gomez‐Alvarez, V., Szabo, J. G., & Hall, J. S. (2020) · Pathogens · doi:10.3390/pathogens9070567 · Cited by 31
Mao, G., Liang, J., Wang, Q., Zhao, C. N., Bai, Y., Liu, R., Liu, H., & Qu, J. (2020) · Journal of Environmental Sciences · doi:10.1016/j.jes.2020.05.014 · Cited by 31
Achtman, M., & Zhou, Z. (2020) · Philosophical Transactions of the Royal Society B Biological Sciences · doi:10.1098/rstb.2019.0573 · Cited by 32
Hu, W., Pan, J., Wang, B., Guo, J., Li, M., & Xu, M. (2020) · Environmental Microbiology · doi:10.1111/1462-2920.15349 · Cited by 33
de Campos, T. A., de Almeida, F. M., Almeida, A. P. C., Nakamura-Silva, R., Oliveira-Silva, M., de Sousa, I. F. A., Cerdeira, L., Lincopán, N., Pappas, G. J., Jr., & Pitondo‐Silva, A. (2021) · Frontiers in Microbiology · doi:10.3389/fmicb.2021.604031 · Cited by 30
Qin, J., Feng, Y., Lu, X., & Zong, Z. (2021) · mSystems · doi:10.1128/msystems.00237-21 · Cited by 31
“32 (46) and genome-to-genome distance calculator (formula 2) (47) with the recommended parameters and/or default settings, respectively.”
BackgroundMcDaniel, E., Moya‐Flores, F., Beach, N. K., Camejo, P. Y., Oyserman, B. O., Kizaric, M., Khor, E. H., Noguera, D. R., & McMahon, K. D. (2021) · mSystems · doi:10.1128/msystems.00474-21 · Cited by 31
“Pairwise genome-wide ANI was calculated among the four Accumulibacter draft genomes and all available Accumulibacter genomes in GenBank with FastANI (40).”
BackgroundMethodMatteoli, F. P., Pedrosa‐Silva, F., Silva, L. D., & Giachini, A. J. (2021) · Genomics · doi:10.1016/j.ygeno.2021.08.009 · Cited by 29
Historical, current, and emerging tools for identification and serotyping of Shigella
Halimeh, F. B., Rafei, R., Osman, M., Kassem, I. I., Diene, S. M., Dabboussi, F., Rolain, J., & Hamzé, M. (2021) · Brazilian Journal of Microbiology · doi:10.1007/s42770-021-00573-5 · Cited by 31
Yuste, A., Angulo, E. L. A., & Torras, M. D. L. Á. C. (2021) · Scientific Reports · doi:10.1038/s41598-021-98723-0 · Cited by 31
Bansal, K., Kumar, S., Kaur, A., Sharma, S., Patil, P. B., & Patil, P. (2021) · Genomics · doi:10.1016/j.ygeno.2021.09.021 · Cited by 31
Hwang, Y., Schulze‐Makuch, D., Arens, F. L., Sáenz, J. S., Adam, P. S., Sager, C., Bornemann, T. L. V., Zhao, W., Zhang, Y., Airo, A., et al. (2021) · Microbiome · doi:10.1186/s40168-021-01177-9 · Cited by 30
Bryson, S., Hunt, K. A., Stahl, D. A., & Winkler, M. K. H. (2022) · Frontiers in Microbiology · doi:10.3389/fmicb.2022.825104 · Cited by 31
“Three of these MAGs were of the order Bryobacteriales (1S_bin014, 1S_bin026, and 2S_bin014) but all pairwise comparisons of average nucleotide identity (ANI) (Jain et al., 2018) were between 77 and 79%.”
BackgroundMethodInfluentialHuang, Y. L., Yu, Z., Liu, L., Che, Y., & Zhang, T. (2022) · Environmental Science & Technology · doi:10.1021/acs.est.2c03656 · Cited by 32
Hickl, O., Queirós, P., Wilmes, P., May, P., & Heintz‐Buschart, A. (2022) · Briefings in Bioinformatics · doi:10.1093/bib/bbac431 · Cited by 30
Genomic comparisons confirm Giardia duodenalis sub-assemblage AII as a unique species
Seabolt, M. H., Roellig, D. M., & Konstantinidis, K. (2022) · Frontiers in Cellular and Infection Microbiology · doi:10.3389/fcimb.2022.1010244 · Cited by 33
“The resulting phylogenies from ASTRAL, STACEY, and FASTANI were visualized and annotated using the Interactive Tree of Life (iTOL) web portal (Letunic and Bork, 2019; URL: https://itol. embl.de).”
MethodSelf-citationKim, S.-H., Yehuala, G. A., Bang, W. Y., Yang, J., Jung, Y. H., & Park, M. (2022) · Microorganisms · doi:10.3390/microorganisms10122494 · Cited by 33
Pitfalls of genotyping microbial communities with rapidly growing genome collections
Zhao, C., Shi, Z. J., & Pollard, K. S. (2023) · Cell Systems · doi:10.1016/j.cels.2022.12.007 · Cited by 33
Ecophysiology and genomics of the brackish water adapted SAR11 subclade IIIa
Lanclos, V. C., Rasmussen, A., Kojima, C. Y., Cheng, C., Henson, M. W., Faircloth, B. C., Francis, C. A., & Thrash, J. C. (2023) · The ISME Journal · doi:10.1038/s41396-023-01376-2 · Cited by 31
The link between increased Desulfovibrio and disease severity in Parkinson’s disease
Nie, S., Jing, Z., Wang, J., Deng, Y., Zhang, Y., Ye, Z., & Ge, Y. (2023) · Applied Microbiology and Biotechnology · doi:10.1007/s00253-023-12489-1 · Cited by 32
Conte, A. L., Brunetti, F., Marazzato, M., Longhi, C., Maurizi, L., Raponi, G., Palamara, A. T., Grassi, S., & Conte, M. P. (2023) · Frontiers in Cellular and Infection Microbiology · doi:10.3389/fcimb.2023.1194254 · Cited by 31
“32 (Jain et al., 2018) and querying the PubMLST dedicated database (Jolley et al.”
Hera, M. R., Pierce‐Ward, N. T., & Koslicki, D. (2023) · Genome Research · doi:10.1101/gr.277651.123 · Cited by 31
“Mash and FastANI both have many zeroed-out values, and therefore, the least-squares fit is not shown for these two.”
InfluentialInsights into early evolutionary adaptations of the Akkermansia genus to the vertebrate gut
González, D., Morales-Olavarria, M., Vidal-Veuthey, B., & Cárdenas, J. P. (2023) · Frontiers in Microbiology · doi:10.3389/fmicb.2023.1238580 · Cited by 30
Recovery and genome reconstruction of novel magnetotactic Elusimicrobiota from bog soil
Uzun, M., Koziaeva, V. V., Dziuba, M. V., Alekseeva, L., Krutkina, M. S., Sukhacheva, M. V., Baslerov, R. V., & Grouzdev, D. S. (2022) · The ISME Journal · doi:10.1038/s41396-022-01339-z · Cited by 30
Teullet, S., Tilak, M., Magdeleine, A., Schaub, R., Weyer, N. M., Panaino, W., Fuller, A., Loughry, W. J., Avenant, N. L., de Thoisy, B., et al. (2023) · mSystems · doi:10.1128/msystems.00388-23 · Cited by 31
Dougherty, P. E., Nielsen, T. K., Riber, L., Lading, H. H., Junco, L. M. F., Kot, W., Raaijmakers, J. M., & Hansen, L. H. (2023) · The ISME Journal · doi:10.1038/s41396-023-01547-1 · Cited by 30
“3.3) [37] nucleotide similarities multiplied with the ratio of aligned fractions.”
InfluentialMicrobial Diversity in African Foods and Beverages: A Systematic Assessment
Ghosh, S. B., Bornman, C., Meskini, M., & Joghataei, M. (2023) · Current Microbiology · doi:10.1007/s00284-023-03481-z · Cited by 34
Jiao, J., Wu, J., Zhou, C., He, Z., Tan, Z., & Wang, M. (2024) · The ISME Journal · doi:10.1093/ismejo/wrae002 · Cited by 28
“Thereafter, our goat kid-specific GKGMC was aligned with RGMC and GMMC using FastANI, according to previously reported genome thresholds for species and strain delineation of ≥ 95% and ≥ 99% ANI, respectively, and ≥ 60% of the genome [36].”
Predicting microbial interactions with approaches based on flux balance analysis: an evaluation
Joseph, C., Zafeiropoulos, H., Bernaerts, K., & Faust, K. (2024) · BMC Bioinformatics · doi:10.1186/s12859-024-05651-7 · Cited by 31
“ANI scores were calculated with the FastANI tool [62].”
MethodExtracellular vesicle formation in Euryarchaeota is driven by a small GTPase
Mills, J., Mills, J., Gebhard, L., Gebhard, L., Schubotz, F., Schubotz, F., Shevchenko, A., Shevchenko, A., Speth, D., Speth, D. R., et al. (2024) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.2311321121 · Cited by 34
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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