Related Experiment Video
Updated: Jul 18, 2026
09:26
Quantification and Whole Genome Characterization of SARS-CoV-2 RNA in Wastewater and Air Samples
Published on: June 30, 2023
Characterizing 56 complete SARS-CoV S-gene sequences from Hong Kong
Julian W Tang1, Jo L K Cheung, Ida M T Chu
1Department of Microbiology, School of Public Health, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong SAR, China.
Summary
Analyzing SARS-CoV spike genes revealed three distinct clusters correlating with outbreak phases. Two novel single nucleotide variations (SNVs) were identified, likely from tissue culture passage.
Area of Science:
- Virology
- Molecular Epidemiology
- Bioinformatics
Background:
- The severe acute respiratory syndrome-associated coronavirus (SARS-CoV) spike (S) gene is crucial for understanding SARS epidemiology.
- The 2003 SARS outbreaks highlighted the need for detailed molecular investigations.
Purpose of the Study:
- To characterize complete SARS-CoV S-gene sequences from Hong Kong.
- To analyze the phylogenetic relationships of SARS-CoV strains.
Main Methods:
- Analysis of 56 SARS-CoV S-gene sequences from Hong Kong patients.
- Utilized a maximum likelihood (ML) approach for phylogenetic reconstruction.
- Compared sequences with 138 human and animal S-genes from GenBank.
Main Results:
- Maximum likelihood (ML) trees indicated minimal evolution within the 56 Hong Kong sequences.
- Three distinct SARS-CoV clusters were identified, correlating with early, middle, and late phases of the 2003 outbreaks.
- Two novel single nucleotide variations (SNVs), T21615A and T21901A, were discovered.
Conclusions:
- The ML approach provides a robust method for reconstructing SARS-CoV phylogenies, confirming previous findings.
- The identified SARS-CoV clusters align with established epidemiological phases of the 2003 outbreak.
- The newly discovered SNVs are likely artifacts of tissue-culture passaging of clinical samples.
Related Concept Videos
01:29Coronavirus
Coronaviruses, including the severe acute respiratory syndrome coronavirus (SARS-CoV), are enveloped viruses characterized by their single-stranded, positive-sense RNA genome and helical nucleocapsid structure. The hallmark of these viruses is their club-shaped spike (S) glycoproteins that protrude from the viral envelope, facilitating attachment to host cells. Typically, coronaviruses infect the upper respiratory tract, often causing mild or asymptomatic disease. However, certain strains like...
01:05Single Nucleotide Polymorphisms-SNPs
A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...