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Cited by 319

The DOI matches its Crossref record; 55 of the 55 references it cites were found in a registry or an index.

Accuracy of taxonomy prediction for 16S rRNA and fungal ITS sequences

Open access
Edgar, Robert C.·2018·PeerJ

Abstract

Prediction of taxonomy for marker gene sequences such as 16S ribosomal RNA (rRNA) is a fundamental task in microbiology. Most experimentally observed sequences are diverged from reference sequences of authoritatively named organisms, creating a challenge for prediction methods. I assessed the accuracy of several algorithms using cross-validation by identity, a new benchmark strategy which explicitly models the variation in distances between query sequences and the closest entry in a reference database. When the accuracy of genus predictions was averaged over a representative range of identities with the reference database (100%, 99%, 97%, 95% and 90%), all tested methods had ≤50% accuracy on the currently-popular V4 region of 16S rRNA. Accuracy was found to fall rapidly with identity; for example, better methods were found to have V4 genus prediction accuracy of ∼100% at 100% identity but ∼50% at 97% identity. The relationship between identity and taxonomy was quantified as the probability that a rank is the lowest shared by a pair of sequences with a given pair-wise identity. With the V4 region, 95% identity was found to be a twilight zone where taxonomy is highly ambiguous because the probabilities that the lowest shared rank between pairs of sequences is genus, family, order or class are approximately equal.

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Metadata

Authors
Edgar, R. C.
Venue
PeerJ
Publisher
PeerJ
Published
2018-04-18
Volume
6
Pages
e4652
ISSN
2167-8359 (ISSN-L)
OpenAlex
W2802266517
Cited by
319
References
55
FWCI
11.22
Type
journal article
Language
en
Open access
gold

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CoChat. (2026). Citation check: Accuracy of taxonomy prediction for 16S rRNA and fungal ITS sequences. https://app.cochat.ai/papers/10.7717/peerj.4652
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Edgar, R. C. (2018). Accuracy of taxonomy prediction for 16S rRNA and fungal ITS sequences. PeerJ. https://doi.org/10.7717/peerj.4652

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