SARS-CoV-2 genome analysis of strains in Pakistan reveals GH, S and L clade strains at the start of the pandemic

Ghanchi, Najia Karim; Masood, Kiran Iqbal; Nasir, Asghar; Khan, Waqasuddin; Abidi, Syed Hani; Shahid, Saba; Mahmood, Syed Faisal; Kanji, Akbar; Razzak, Safina; Ansar, Zeeshan; Islam, Nazneen; Dharejo, M. B.; Hasan, Zahra; Hasan, Rumina

Objectives Pakistan has a high infectious disease burden with about 265,000 reported cases of COVID-19. We investigated the genomic diversity of SARS-CoV-2 strains and present the first data on viruses circulating in the country. Methods We performed whole-genome sequencing and data analysis of SARS-CoV-2 eleven strains isolated in March and May. Results Strains from travelers clustered with those from China, Saudi Arabia, India, USA and Australia. Five of eight SARS-CoV-2 strains were GH clade with Spike glycoprotein D614G, Ns3 gene Q57H, and RNA dependent RNA polymerase (RdRp) P4715L mutations. Two were S (ORF8 L84S and N S202N) and three were L clade and one was an I clade strain. One GH and one L strain each displayed Orf1ab L3606F indicating further evolutionary transitions. Conclusions This data reveals SARS-CoV-2 strains of L, G, S and I have been circulating in Pakistan from March, at the start of the pandemic. It indicates viral diversity regarding infection in this populous region. Continuing molecular genomic surveillance of SARS-CoV-2 in the context of disease severity will be important to understand virus transmission patterns and host related determinants of COVID-19 in Pakistan.