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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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Bezdíček, M., Hansliková, J., Nykrýnová, M., Dufková, K., Kocmanová, I., Kubáčková, P., Mayer, J., & Lengerová, M. (2023) · Microbiology Spectrum · doi:10.1128/spectrum.05107-22 · Cited by 27
“To ensure the accuracy of our data set, we used high-throughput average nucleotide identity (ANI) analysis (32) against a reference E.”
MethodKeresztény, T., Libisch, B., Orbe, S. C., Nagy, T., Kerényi, Z., Kocsis, R., Posta, K., Papp, P., & Olasz, F. (2023) · Probiotics and Antimicrobial Proteins · doi:10.1007/s12602-023-10113-2 · Cited by 29
“The used commands were the following for Limosilactobacillus :tree1 <- read.tree(“Limosilactobacillus.tree”); plot(tree1)and for Leuconostoc : tree2 <- read.tree(“Leuconostoc.tree”); plot(tree2) Similarity matrixes were created by using FastANI (version 1.33) [43].”
MethodInfluentialChan, C. S., Dykes, G. E., Hoover, R. L., Limmer, M. A., & Seyfferth, A. L. (2023) · Applied and Environmental Microbiology · doi:10.1128/aem.00570-23 · Cited by 30
Genomic revisitation and reclassification of the genus Providencia
Dong, X., Jia, H., Yu, Y., Xiang, Y., & Zhang, Y. (2024) · mSphere · doi:10.1128/msphere.00731-23 · Cited by 27
“33 (51) and genome-to-genome distance calculator (formula 2) (25, 52), respectively.”
The global speciation continuum of the cyanobacterium Microcoleus
Stanojković, A., Skoupý, S., Johannesson, H., & Dvořák, P. (2024) · Nature Communications · doi:10.1038/s41467-024-46459-6 · Cited by 29
Ferrihydrite-mediated methanotrophic nitrogen fixation in paddy soil under hypoxia
Yu, L., Jia, R., Liu, S., Li, S., Zhong, S., Liu, G., Zeng, R. J., Rensing, C., & Zhou, S. (2024) · ISME Communications · doi:10.1093/ismeco/ycae030 · Cited by 27
“%) demarcating different species [ 53], suggesting that it is possibly a novel Methylocystis sp. Particulate methane monooxygenase and soluble methane monooxygenase,encoded bythe pmoCAB operonand mmoXYBZDC operon, respectively, are two central enzymes for converting methane to methanol [54]. pmoC…”
BackgroundRidley, R. S., Conrad, R. E., Lindner, B. G., Woo, S., & Konstantinidis, K. T. (2024) · Scientific Reports · doi:10.1038/s41598-024-59279-x · Cited by 32
“All vs. all genome comparisons across the study were completed at the ANI and AAI level using fastANI 106 and fastAAI 121 respectively.”
MethodSelf-citationLu, K., Wang, X., Zhou, Y., & Zhu, Q. (2024) · BMC Microbiology · doi:10.1186/s12866-024-03304-6 · Cited by 27
“ANI values surpass 95% for the same species and fall below 95% for different species [50].”
BackgroundInhibition of autotrophic nitrifiers in a nitrogen-rich paddy soil by elevated CO2
Zhang, K., Lei, W., Zhang, H., Xu, C., Xiao, J., Li, S., Liang, M., He, J., Lai, Y., Li, R., et al. (2024) · Nature Geoscience · doi:10.1038/s41561-024-01583-2 · Cited by 28
“The pairwise average nucleotide identities and average amino acid identities were calculated using FastANI (v.1.33) 70 and CompareM (v.0.1.2, https://github.com/dparks1134/CompareM), respectively.”
InfluentialGrowth promotion on maize and whole-genome sequence analysis of Bacillus velezensis D103
Zhang, Y., Zhang, N., Bi, X., Bi, T., Baloch, F. B., Miao, J., Zeng, N., Li, B., & An, Y. (2024) · Microbiology Spectrum · doi:10.1128/spectrum.01147-24 · Cited by 27
Tagirdzhanova, G. M., Scharnagl, K., Sahu, N., Xia, Y., Bucknell, A., Bentham, A. R., Jégousse, C., Ament‐Velásquez, S. L., Brännström, I. O., Johannesson, H., et al. (2025) · Current Biology · doi:10.1016/j.cub.2024.12.041 · Cited by 31
Murovec, B., Deutsch, L., & Stres, B. (2019) · Molecular Biology and Evolution · doi:10.1093/molbev/msz237 · Cited by 27
“Although the tools are widely used, a number of limitations (supplementary table S1, Supplementary Material online) and their dispersed and boutique nature is limiting their integration and presents an obstacle to their reproducible use within community, their further adoption alongside the ubiquitous increases in seq…”
BackgroundMethodResultInfluentialLechuga, A., Lood, C., Salas, M., van Noort, V., Lavigne, R., & Redrejo‐Rodríguez, M. (2020) · G3 Genes Genomes Genetics · doi:10.1534/g3.120.401361 · Cited by 27
Kehlet-Delgado, H., Häse, C. C., & Mueller, R. (2020) · BMC Genomics · doi:10.1186/s12864-020-06980-6 · Cited by 27
“Average-nucleotide identity (ANI) values between all sequenced genomes and a downloaded set of reference genomes from all Vibrio species available from NCBI Genbank (date accessed: May 1st 2018) were calculated using the tool FastANI [74].”
MethodComparative genome analysis proposes three new Aureobasidium species isolated from grape juice
Onetto, C. A., Schmidt, S. A., Roach, M. J., & Borneman, A. R. (2020) · FEMS Yeast Research · doi:10.1093/femsyr/foaa052 · Cited by 27
Mancabelli, L., Mancino, W., Lugli, G. A., Milani, C., Viappiani, A., Anzalone, R., Longhi, G., van Sinderen, D., Ventura, M., & Turroni, F. (2021) · Applied and Environmental Microbiology · doi:10.1128/aem.02899-20 · Cited by 27
“crispatus genomes analyzed was calculated with fastANI software (103).”
MethodHuang, Y. L., Gu, D., Xue, H., Yu, J., Tang, Y., Huang, J., Zhang, Y., & Jiao, X. (2021) · Frontiers in Microbiology · doi:10.3389/fmicb.2021.649010 · Cited by 29
“1) or C. colitype strain NCTC 11366 (refseq ID GCF_900446355), calculated using FastANI (Jain et al., 2018), was higher than the species demarcation threshold of 95% (Richter and Rossello-Mora, 2009); and (ii) the genome harbored mapA or ceuE genes and the corresponding genes could be in silico amplified (Stucki et al…”
MethodGenomic Approaches to Plant-Pathogen Epidemiology and Diagnostics
Weisberg, A. J., Grünwald, N. J., Savory, E. A., Putnam, M. L., & Chang, J. H. (2021) · Annual Review of Phytopathology · doi:10.1146/annurev-phyto-020620-121736 · Cited by 27
Moon, S. H., Udaondo, Z., Abram, K. Z., Li, X., Xu, Y., DiCaprio, E. L., Jun, S., & Huang, E. (2021) · Food Control · doi:10.1016/j.foodcont.2021.108559 · Cited by 27
Bartonella machadoae sp. nov. isolated from wild rodents in the Pantanal wetland
do Amaral, R. B., Cardozo, M. V., Varani, A. M., Gonçalves, L. R., Furquim, M. E. C., Dias, C. M., Santana, M. D. S., de Assis, W. O., da Silva, A. R., Herrera, H. M., et al. (2022) · Acta Tropica · doi:10.1016/j.actatropica.2022.106368 · Cited by 27
Tamizi, A. A., Amin, N. M., Weaver, J. A., Olumakaiye, R., Akbar, M. A., Jin, S., Bunawan, H., & Alberti, F. (2022) · Journal of Fungi · doi:10.3390/jof8030246 · Cited by 27
Strain-Level Variation and Diverse Host Bacterial Responses in Episymbiotic Saccharibacteria
Nie, J., Utter, D., Kerns, K. A., Lamont, E., Hendrickson, E., Liu, J., Wu, T., He, X., McLean, J., & Bor, B. (2022) · mSystems · doi:10.1128/msystems.01488-21 · Cited by 29
“These ANI values stand out from typical intraspecific ANI values, which are at or above 95% or 97%, although known exceptions exist (31, 32, 40).”
BackgroundStrain-level profiling of viable microbial community by selective single-cell genome sequencing
Hosokawa, M., Endoh, T., Kamata, K., Arikawa, K., Nishikawa, Y., Kogawa, M., Saeki, T., Yoda, T., & Takeyama, H. (2022) · Scientific Reports · doi:10.1038/s41598-022-08401-y · Cited by 27
Belaouni, H. A., Compant, S., Antonielli, L., Nikolić, B., Zitouni, A., & Sessitsch, A. (2022) · Applied Microbiology and Biotechnology · doi:10.1007/s00253-022-11907-0 · Cited by 27
“3 (Jain et al. 2018) and Morpheus (https:// softw are.”
Modular evolution of secretion systems and virulence plasmids in a bacterial species complex
Chou, L., Lin, Y.-C., Haryono, M., Santos, M. N. M., Cho, S., Weisberg, A. J., Wu, C., Chang, J. H., Lai, E., & Kuo, C. (2022) · BMC Biology · doi:10.1186/s12915-021-01221-y · Cited by 27
Li, Z., Liao, F., Ding, Z., Chen, S., & Li, D. (2022) · INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY · doi:10.1099/ijsem.0.005474 · Cited by 27
Li, J., Dong, C., Lai, Q., Wang, G., & Shao, Z. (2022) · mSystems · doi:10.1128/msystems.00864-22 · Cited by 27
Tandon, K., Ricci, F., Costa, J. F., Medina, M., Kühl, M., Blackall, L. L., & Verbruggen, H. (2022) · GigaScience · doi:10.1093/gigascience/giac127 · Cited by 27
RND pumps across the genus Acinetobacter: AdeIJK is the universal efflux pump
Darby, E. M., Bavro, V. N., Dunn, S. J., McNally, A., & Blair, J. M. A. (2023) · Microbial Genomics · doi:10.1099/mgen.0.000964 · Cited by 27
“1) was confirmed to be >95 % using fastANI (v.1.31) [39].”
InfluentialYue, Y., Zheng, J., Sheng, M., Liu, X., Hao, Q., Zhang, S.-X., Xu, S., Liu, Z., Hou, X., Jing, H., et al. (2023) · Infectious Diseases of Poverty · doi:10.1186/s40249-023-01063-6 · Cited by 27
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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