Generating and evaluating type I interferon receptor-deficient and feline TMPRSS2-expressing cells for propagating serotype I feline infectious peritonitis virus.

Abstract:

:Feline coronavirus infection can progress to a fatal infectious peritonitis, which is a widespread feline disease without an effective vaccine. Generating feline cells with reduced ability to respond to interferon (IFN) is an essential step facilitating isolation of new candidate vaccine strains. Here, we describe the use of Crispr/Cas technology to disrupt type I IFN signaling in two feline cell lines, AK-D and Fcwf-4 CU, and evaluate the replication kinetics of a serotype I feline infectious peritonitis virus (FIPV) within these cells. We report that polyclonal cell populations and a clonal isolate, termed Fcwf-4 IRN, exhibited significantly diminished IFN-responsiveness and allowed FIPV replication kinetics comparable to parental cells. Furthermore, we demonstrate that replication of FIPV is enhanced by ectopic expression of a host serine protease, TMPRSS2, in these cells. We discuss the potential of these cells for isolating new clinical strains and for propagating candidate vaccine strains of FIPV.

journal_name

Virology

journal_title

Virology

authors

Mettelman RC,O'Brien A,Whittaker GR,Baker SC

doi

10.1016/j.virol.2019.08.030

subject

Has Abstract

pub_date

2019-11-01 00:00:00

pages

226-236

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(19)30255-7

journal_volume

537

pub_type

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