Discrimination between Haemaphysalis longicornis and H. qinghaiensis based on the partial 16S rDNA and the second internal transcribed spacer (ITS-2).
Summary of "Discrimination between Haemaphysalis longicornis and H. qinghaiensis based on the partial 16S rDNA and the second internal transcribed spacer (ITS-2)."
In the present study, two hard tick species, Haemaphysalis longicornis and H. qinghaiensis from North-western China were characterized genetically by the second internal transcribed spacer (ITS-2) of nuclear ribosomal DNA and partial 16S rDNA. Based on a fragment within the hypervariable region of 16S rDNA with the length of approximately 453 bp, the phylogenetic trees were constructed by Neighbor-Joining and Maximum-parsimony methods. The results indicated that the phylogenetic status of H. qinghaiensis was distant from that of H. longicornis and closer to H. flava. Furthermore, the ITS-2 rDNA was amplified by PCR and sequenced from individual ticks. The length of ITS-2 is 1,606 bp for H. longicornis and 1,162 bp for H. qinghaiensis. Although sequence variation between the immature stages of H. longicornis was 0.1-0.4%, nucleotide differences between the tested species ranged 2.1-23.2%, indicating that ITS-2 rDNA sequences are genetic markers for the differentiation of the two hard ticks in China. Hence, a PCR-linked restriction fragment length polymorphism (RFLP) approach was developed for their unequivocal differentiation based on ITS-2 rDNA, which provides the foundation for further studies on ticks in China and has implications for studying the population genetic structure of the ticks and for identification and differentiation of closely related ticks.
Key Laboratory of Veterinary Parasitology of Gansu Province, State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 1 Xujianping, 730046, Yanchangbu, Lanzhou, Gansu Province
This article was published in the following journal.
Name: Experimental & applied acarology
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21225446
- DOI: http://dx.doi.org/10.1007/s10493-010-9423-3
Medical and Biotech [MESH] Definitions
Epilepsy, Partial, Sensory
A disorder characterized by recurrent focal onset seizures which have sensory (i.e., olfactory, visual, tactile, gustatory, or auditory) manifestations. Partial seizures that feature alterations of consciousness are referred to as complex partial seizures (EPILEPSY, COMPLEX PARTIAL).
Conditions characterized by recurrent paroxysmal neuronal discharges which arise from a focal region of the brain. Partial seizures are divided into simple and complex, depending on whether consciousness is unaltered (simple partial seizure) or disturbed (complex partial seizure). Both types may feature a wide variety of motor, sensory, and autonomic symptoms. Partial seizures may be classified by associated clinical features or anatomic location of the seizure focus. A secondary generalized seizure refers to a partial seizure that spreads to involve the brain diffusely. (From Adams et al., Principles of Neurology, 6th ed, pp317)
Denture, Partial, Immediate
A partial denture constructed before the teeth it replaces are removed. It is then inserted immediately after the removal of the natural teeth for functional and cosmetic reasons during the healing process. It is to be replaced later by the fitted partial denture.
Epilepsy, Complex Partial
A disorder characterized by recurrent partial seizures marked by impairment of cognition. During the seizure the individual may experience a wide variety of psychic phenomenon including formed hallucinations, illusions, deja vu, intense emotional feelings, confusion, and spatial disorientation. Focal motor activity, sensory alterations and AUTOMATISM may also occur. Complex partial seizures often originate from foci in one or both temporal lobes. The etiology may be idiopathic (cryptogenic partial complex epilepsy) or occur as a secondary manifestation of a focal cortical lesion (symptomatic partial complex epilepsy). (From Adams et al., Principles of Neurology, 6th ed, pp317-8)
Denture, Partial, Fixed
A partial denture attached to prepared natural teeth, roots, or implants by cementation.
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