Identification of putative expansin-like genes from the pine wood nematode, Bursaphelenchus xylophilus, and evolution of the expansin gene family within the Nematoda

AbstractWe report the cloning and characterisation of genes encoding expansin-like proteins from the pine wood nematodes, Bursaphelenchus xylophilus and B. mucronatus. A small family of genes is present in both species and the Bursaphelenchus genes are most similar to expansins and expansin-like pro...

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Published in:Nematology : international journal of fundamental and applied nematological research 2009-01, Vol.11 (3), p.355-364
Main Authors: Kikuchi, Taisei, Li, Hongmei, Karim, Nurul, Kennedy, Malcolm W, Moens, Maurice, Jones, John T
Format: Article
Language:English
Subjects:
Aphelenchida
Bursaphelenchus
Bursaphelenchus xylophilus
EVOLUTION
Globodera rostochiensis
HORIZONTAL GENE TRANSFER
HOST-PARASITE INTERACTIONS
MOLECULAR BIOLOGY
Nematoda
Solanum tuberosum
Tylenchida
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Summary:AbstractWe report the cloning and characterisation of genes encoding expansin-like proteins from the pine wood nematodes, Bursaphelenchus xylophilus and B. mucronatus. A small family of genes is present in both species and the Bursaphelenchus genes are most similar to expansins and expansin-like proteins from the potato cyst nematode Globodera rostochiensis and root-knot nematodes. Molecular modelling suggests that the genes could encode a protein with a structure similar to that of functionally characterised expansins. Expression analysis showed that the Bursaphelenchus expansin-like genes are expressed solely in the pharyngeal gland cells, implying a role in the host-parasite interaction, most likely in assisting migration through the plant. Some G. rostochiensis and root-knot nematode expansins are composed of a carbohydrate-binding domain coupled to an expansin domain but no carbohydrate binding domain is present on any of the Bursaphelenchus sequences. We suggest a model for evolution of the expansin gene family within the plant-parasitic nematodes of the Tylenchida and Aphelenchida.
ISSN:1388-5545
1568-5411
1388-5545
DOI:10.1163/156854109X446953