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Identification of some heat-induced genes of Trichinella spiralis

  • C. H. MAK (a1), K. W. SUN (a1) and R. C. KO (a1)


Three heat-induced genes of the infective-stage larvae of Trichinella spiralis were successfully identified by the suppression subtractive hybridization (SSH) technique. As indicated by reverse Northern blotting, 19 of 25 clones were scored as differentially transcribed in the heat-shocked infective-stage larvae. The sequencing data showed the presence of 12 different genes. Three were homologous to histone H3, histone H2B and translationally controlled tumour protein (TCTP). A 0.6 kb cDNA of histone H3 was generated by the RACE method and sequenced. It contained an open reading frame of 136 amino acids that demonstrated 94% identity with genes from Drosophila hydei. Semi-quantitative RT-PCR indicated that after heat-shock treatment, the expression levels of histone H3, histone H2B and TCTP increased 4.8, 27 and 5.7-fold, respectively. Northern analysis confirmed the upregulation of histone H3, histone H2B and TCTP transcripts. The upregulation of these genes during stress conditions has not been reported in parasitic organisms. The stress proteins may play an active role to sustain the parasite after exposure to hostile host factors.


Corresponding author

Corresponding author: 5S-13, Kadoorie Biological Science Building, Department of Zoology, The University of Hong Kong, Pokfulam, Hong Kong, China. Tel: + 852 22990835. Fax: +852 25599114. E-mail:


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Identification of some heat-induced genes of Trichinella spiralis

  • C. H. MAK (a1), K. W. SUN (a1) and R. C. KO (a1)


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