Learning novel SARS-CoV-2 lineages from wastewater sequencing data

Author:

Ellmen Isaac1,Overton Alyssa K.1,Knapp Jennifer J.1,Nash Delaney1,Ho Hannifer1,Hungwe Yemurayi1,Prasla Samran1,Nissimov Jozef I.1,Charles Trevor C.1

Affiliation:

1. University of Waterloo

Abstract

Abstract Background: Wastewater surveillance of SARS-CoV-2 has emerged as a critical tool for tracking the spread of COVID-19.In addition to estimating the relative case numbers using quantitative PCR, SARS-CoV-2 genomic RNA can be extracted from wastewater and sequenced.There are many existing techniques for using the sequenced RNA to determine the relative abundance of known lineages in a sample.However, it is very challenging to predict novel lineages from wastewater data due to its mixed composition and unreliable genomic coverage. Results: In this work, we present a novel technique based on non-negative matrix factorization which is able to extract novel lineage definitions by analyzing data from across different samples.We test the method both on synthetic and real wastewater sequencing data.We show that the technique is able to determine major lineages such as Omicron and Delta as well as sub-lineages such as BA.5.2.1. Conclusions: We provide a method for determining emerging lineages in wastewater without the need for genomic data from clinical samples. This could be used for routine monitoring of SARS-CoV-2 as well as other emerging viral pathogens in wastewater. Additionally, it may be used to derive more sequences for viruses with fewer complete genomes.

Publisher

Research Square Platform LLC

Reference48 articles.

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