The genome polishing tool POLCA makes fast and accurate corrections in genome assemblies

2024-06-01 08:44:50

The genome polishing tool POLCA makes fast and accurate corrections in genome assemblies 基因组抛光工具POLCA可以在基因组组装中进行快速和准确的校正

Aleksey V Zimin 1 2, Steven L Salzberg 1 2 3 4

Affiliations expand

PMID: 32589667
PMCID: PMC7347232
DOI: 10.1371/journal.pcbi.1007981

Free PMC article

Abstract

The introduction of third-generation DNA sequencing technologies in recent years has allowed scientists to generate dramatically longer sequence reads, which when used in whole-genome sequencing projects have yielded better repeat resolution and far more contiguous genome assemblies. While the promise of better contiguity has held true, the relatively high error rate of long reads, averaging 8-15%, has made it challenging to generate a highly accurate final sequence. Current long-read sequencing technologies display a tendency toward systematic errors, in particular in homopolymer regions, which present additional challenges. A cost-effective strategy to generate highly contiguous assemblies with a very low overall error rate is to combine long reads with low-cost short-read data, which currently have an error rate below 0.5%. This hybrid strategy can be pursued either by incorporating the short-read data into the early phase of assembly, during the read correction step, or by using short reads to "polish" the consensus built from long reads. In this report, we present the assembly polishing tool POLCA (POLishing by Calling Alternatives) and compare its performance with two other popular polishing programs, Pilon and Racon. We show that on simulated data POLCA is more accurate than Pilon, and comparable in accuracy to Racon. On real data, all three programs show similar performance, but POLCA is consistently much faster than either of the other polishing programs.

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