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A point mutation in which a purine is replaced by a pyrimidine, or a pyrimidine is replaced by a purine.

[Probably trans- + (in)version.]


1. a turning across, or into, something else
2. (Microbiology) (in nucleic acid) the substitution of a purine for a pyrimidine, or vice versa, by mutation
References in periodicals archive ?
130G>A transversion had altered the Ala/A-44 codon (GCA) to Thr/T-44 codon (ACA), designated p.
4, 12) Between 70% and 90% of BRAF mutations involve a single base transversion (T>A) in exon 15, which results in the substitution of glutamic acid for valine at amino acid position 600 (BRAF V600E) (Figure 3).
The research carried out in many centers in the world, it was found that the most common mutation in codons 12 and 13 is a transition of guanine to adenine and guanine to thymine transversion (except for residents of the former Yugoslavia, who had dominated transversion of guanine to thymine).
Sequencing results confirmed the presence of a novel SNP with G to T transversion in the 5' UTR of PBD-1 gene (Figure 1c).
Among the major mutations in HBV that have been associated with the development of HCC, those found in the region of the basal core promoter (BCP), which involve a transversion of adenine for thymine at nucleotide 1762 (A1762T) and a transition of guanine to adenine at nucleotide 1764 (G1764A), have been widely studied and associated with an increased severity of infection (13).
While transversions are the least common type of point mutation responsible for the diversity of the mitochondrial genome, transversion-based SNPs appear to be reliable markers for the differentiation of a number of domestic animals, as well as some endangered mammals such as manatees (Ferreira et al.
ND2 gene based homology analysis showed 22 transitions and 1 transversion but not a single indel.