Teladorsagia circumcincta: Molecular characterisation of the avr-14B subunit and its relatively minor role in ivermectin resistance

Teladorsagia circumcincta: Molecular characterisation of the avr-14B subunit and its relatively minor role in ivermectin resistance

8 páginas, 2 figuras.

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Main Authors: Martínez Valladares, María, Geldhof, Peter, Jonsson, Nicholas, Rojo Vázquez, Francisco Antonio, Skuce, Philip
Format: artículo biblioteca
Language:English
Published: Elsevier 2012
Subjects:Teladorsagia circumcincta, Sheep, Anthelmintic resistance, Ivermectin, GluCI channels,
Online Access:http://hdl.handle.net/10261/73209
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spelling dig-igm-es-10261-732092021-12-27T15:55:43Z Teladorsagia circumcincta: Molecular characterisation of the avr-14B subunit and its relatively minor role in ivermectin resistance Martínez Valladares, María Geldhof, Peter Jonsson, Nicholas Rojo Vázquez, Francisco Antonio Skuce, Philip Teladorsagia circumcincta Sheep Anthelmintic resistance Ivermectin GluCI channels 8 páginas, 2 figuras. Individual mutations (e.g. L256F) and polymorphisms in the avr-14B gene, a glutamate-gated chloride channel subunit, have been associated with ivermectin (IVM) resistance in Caenorhabditis elegans and Cooperia oncophora. The aim of the present study was to determine the full-length coding sequence of the avr-14B subunit homologue in Teladorsagia circumcincta and determine the presence/absence of the putative L256F SNP or any other potential SNPs of interest. Subsequently, we investigated sequence polymorphisms and transcription patterns between four different T. circumcincta isolates: two from Scotland (MTci1 susceptible and MTci5 triple resistant to benzimidazoles, levamisole and IVM) and two from Spain (S-Sp susceptible and R-Sp double resistant to levamisole and IVM). The complete amino acid sequence of the T. circumcincta avr-14B subunit comprises 438 amino acids. Pyrosequencing analysis failed to detect the presence of the L256F mutation in any of the MTci5 or Sp-R samples tested. However, we revealed significant allele frequency changes by means of SSCP analysis of a 106 bp region encompassing the L256F SNP. Allele E showed the greatest change, following IVM exposure in vitro and in vivo, although sequence analysis did not reveal any coding changes. Sequence analysis of the fulllength avr-14B coding sequence showed that two SNPs exclusively found in the resistant strain McTi5 (I270F and T305A) are situated in codons involved in the interaction of the receptor with IVM. Moreover, other potentially significant SNPs (K361E and L364M) were identified between transmembrane regions 3 and 4. However, due to the low frequency of all these SNPs, we cannot conclude they confer IVM resistance in T. circumcincta. Moreover, a modest increase in expression of the avr-14B in both resistant isolates has been shown although these differences were not sufficiently great to consider avr-14B to be the sole or even a major determinant of IVM resistance in this species. This study has been funded by the national projects INIA-MEC, RTA2006-00183-C03-02 and RTA2010-00094-C03-02. The work of María Martínez-Valladares has been supported by a postdoctoral Jae-Doc contract from the Consejo Superior de Investigaciones Científicas (CSIC) and co-funded by the European Social Fund. The authors would also like to thank Dr. Jeff Eng, McGill University, Montreal, QC for his help with the SSCP analysis and Dr Fiona Kenyon of the Moredun Research Institute, Edinburgh, for her help with the LFIA analysis. The financial support of the Scottish Government Rural and Environmental Research and Analysis Directorate (RERAD) is gratefully acknowledged. Peer reviewed 2013-04-01T08:34:51Z 2013-04-01T08:34:51Z 2012 artículo http://purl.org/coar/resource_type/c_6501 International Journal for Parasitology: Drugs and Drug Resistance 2: 154-161 (2012) 2211-3207 http://hdl.handle.net/10261/73209 10.1016/j.ijpddr.2012.03.005 24533276 en http://dx.doi.org/10.1016/j.ijpddr.2012.03.005 open Elsevier
institution IGM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-igm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del IGM España
language English
topic Teladorsagia circumcincta
Sheep
Anthelmintic resistance
Ivermectin
GluCI channels
Teladorsagia circumcincta
Sheep
Anthelmintic resistance
Ivermectin
GluCI channels
spellingShingle Teladorsagia circumcincta
Sheep
Anthelmintic resistance
Ivermectin
GluCI channels
Teladorsagia circumcincta
Sheep
Anthelmintic resistance
Ivermectin
GluCI channels
Martínez Valladares, María
Geldhof, Peter
Jonsson, Nicholas
Rojo Vázquez, Francisco Antonio
Skuce, Philip
Teladorsagia circumcincta: Molecular characterisation of the avr-14B subunit and its relatively minor role in ivermectin resistance
description 8 páginas, 2 figuras.
format artículo
topic_facet Teladorsagia circumcincta
Sheep
Anthelmintic resistance
Ivermectin
GluCI channels
author Martínez Valladares, María
Geldhof, Peter
Jonsson, Nicholas
Rojo Vázquez, Francisco Antonio
Skuce, Philip
author_facet Martínez Valladares, María
Geldhof, Peter
Jonsson, Nicholas
Rojo Vázquez, Francisco Antonio
Skuce, Philip
author_sort Martínez Valladares, María
title Teladorsagia circumcincta: Molecular characterisation of the avr-14B subunit and its relatively minor role in ivermectin resistance
title_short Teladorsagia circumcincta: Molecular characterisation of the avr-14B subunit and its relatively minor role in ivermectin resistance
title_full Teladorsagia circumcincta: Molecular characterisation of the avr-14B subunit and its relatively minor role in ivermectin resistance
title_fullStr Teladorsagia circumcincta: Molecular characterisation of the avr-14B subunit and its relatively minor role in ivermectin resistance
title_full_unstemmed Teladorsagia circumcincta: Molecular characterisation of the avr-14B subunit and its relatively minor role in ivermectin resistance
title_sort teladorsagia circumcincta: molecular characterisation of the avr-14b subunit and its relatively minor role in ivermectin resistance
publisher Elsevier
publishDate 2012
url http://hdl.handle.net/10261/73209
work_keys_str_mv AT martinezvalladaresmaria teladorsagiacircumcinctamolecularcharacterisationoftheavr14bsubunitanditsrelativelyminorroleinivermectinresistance
AT geldhofpeter teladorsagiacircumcinctamolecularcharacterisationoftheavr14bsubunitanditsrelativelyminorroleinivermectinresistance
AT jonssonnicholas teladorsagiacircumcinctamolecularcharacterisationoftheavr14bsubunitanditsrelativelyminorroleinivermectinresistance
AT rojovazquezfranciscoantonio teladorsagiacircumcinctamolecularcharacterisationoftheavr14bsubunitanditsrelativelyminorroleinivermectinresistance
AT skucephilip teladorsagiacircumcinctamolecularcharacterisationoftheavr14bsubunitanditsrelativelyminorroleinivermectinresistance
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