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Discovery of a new Theileria sp. closely related to Theileria annulata in cattle from Sri Lanka
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Discovery of a new Theileria sp. closely related to Theileria annulata in cattle from Sri Lanka
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Journal Article
Discovery of a new Theileria sp. closely related to Theileria annulata in cattle from Sri Lanka
2019
Overview
Theileria annulata
is a haemoprotozoan parasite that causes a cancer-like illness known as tropical theileriosis in cattle. In the course of analyzing the genetic diversity of
T
.
annulata
in Sri Lanka, we observed that merozoite-piroplasm surface antigen (
tams1
) and surface protein (
tasp
)-like gene sequences obtained from bovine blood DNA samples, which were PCR-positive for
T
.
annulata
, were conserved but shared low identity with
T
.
annulata
GenBank sequences. Moreover, the 18S rRNA sequences from the Sri Lankan samples contained ten unique single-nucleotide polymorphisms compared with all known
T
.
annulata
sequences. The cytochrome b (
cob
) gene sequences isolated from the Sri Lankan samples were highly conserved and shared low identity scores with similarly conserved
T
.
annulata
sequences from GenBank. Phylogenetic analysis showed that the Sri Lankan
tams1
-like,
tasp
-like, 18S rRNA, and
cob
sequences clustered together and formed sister clades to the common ancestors of all known
T
.
annulata
and
Theileria lestoquardi
sequences. These findings demonstrated that the Sri Lankan cattle were not infected with
T
.
annulata
but with a new
Theileria
sp. (designated as
Theileria
sp. Yokoyama) closely related to
T
.
annulata
.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ 45/23
/ 45/77
/ Animals
/ Antigens
/ Cattle
/ Disease
/ Genes
/ Humanities and Social Sciences
/ Proteins
/ rRNA 18S
/ Science
/ Single-nucleotide polymorphism
/ Theileria - isolation & purification
/ Theileria annulata - classification
/ Theileria annulata - genetics
