DNA sequence of ref(2)Pp and ref(2)Po1 have been compared, revealing numerous point mutations all along the sequence. Four main variations are (i) In exon 1, ref(2)Po1 encodes glutamine-asparagine (nucleotides 453-458 read CAGAAT), ref(2)Pp encodes glycine (nucleotides GGA), (ii) In exon 2, ref(2)Pp has a 21bp deletion between positions 1556 and 1578, (iii) In exon 2, ref(2)Pp has a 24bp deletion between positions 2196 and 2221, (iv) In intron 1 of ref(2)Pp a 7bp insertion is a perfect repeat of a motif that may be important in secondary structure and is present 23bp upstream.
Replaced with "GGA" in ref(2)Pp strain which is restrictive for sigma virus replication. One of several differences between permissive ref(2)Po and restrictive ref(2)Pp strains.
A19538839G
I32V | ref(2)P-PA; I32V | ref(2)P-PB
One of several differences between permissive ref(2)Po and restrictive ref(2)Pp strains.
A19538873T
Q43L | ref(2)P-PA; Q43L | ref(2)P-PB
One of several differences between permissive ref(2)Po and restrictive ref(2)Pp strains.
Insertion of "TGTTTGC" in ref(2)Pp strain which is restrictive for sigma virus replication. One of several differences between permissive ref(2)Po and restrictive ref(2)Pp strains.
Deletion of 21bp in ref(2)Pp strain which is restrictive for sigma virus replication. One of several differences between permissive ref(2)Po and restrictive ref(2)Pp strains.
A19540067T
T231S | ref(2)P-PA; T231S | ref(2)P-PB
One of several differences between permissive ref(2)Po and restrictive ref(2)Pp strains.
A19540367C
S331R | ref(2)P-PA; S331R | ref(2)P-PB
One of several differences between permissive ref(2)Po and restrictive ref(2)Pp strains.
Deletion of 24bp in ref(2)Pp strain which is restrictive for sigma virus replication. One of several differences between permissive ref(2)Po and restrictive ref(2)Pp strains.
C19541002G
D542E | ref(2)P-PA; D542E | ref(2)P-PB
One of several differences between permissive ref(2)Po and restrictive ref(2)Pp strains.
Restrictive for sigma virus multiplication. CO2 resistant.
Restrictive for rhabovirus sigma infection.
RK1. No known morphological effect. Growth of CO2-sensitivity virus is inhibited when in homozygous state.
restrictive allele
Isolated from: Paris stock.
Frequency of ref(2)Pp allele compared to that of ref(2)Po did not change during time course of study of sigma virus Type I and Type II frequencies.
Restrictive (resistant) line to the sigma virus, determined by a CO2 sensitivity assay.
Reduces the possibility of infection and prevents hereditary transmission. Found in Paris strain.