4.6 Article

Decontamination protocols affect the internal microbiota of ticks

期刊

PARASITES & VECTORS
卷 16, 期 1, 页码 -

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BMC
DOI: 10.1186/s13071-023-05812-2

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Ticks; Microbiota; Bleach; External contamination

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Studies on tick microbiota have raised hypotheses about the impact of bacterial community on tick physiology and competition with tick-borne pathogens. However, little is known about the origin of microbiota in newly hatched tick larvae. This study aimed to identify the source(s) of microbiota in unfed tick larvae and determine effective methods for decontaminating tick eggs for microbiota studies. The results showed that bleach washes disrupted the tick's internal microbiota and the ovary was identified as a main source of tick microbiota.
Studies on the microbiota of ticks have promoted hypotheses about the combined effects of the bacterial community, its functional contributions to the tick's physiology or probable competition effects with some tick-borne pathogens. However, knowledge on the origin of the microbiota of newly hatched larvae is missing. This study aimed to elucidate the source(s) of the microbiota in unfed tick larvae, addressing the composition of the core microbiota and the best ways to decontaminate eggs for microbiota studies. We applied laboratory degree bleach washes and/or ultraviolet light treatments on engorged Rhipicephalus australis females and/or their eggs. No significant effects of these treatments on the reproductive parameters of females and the hatching rates of eggs were observed. However, the different treatments did show striking effects on the composition of the microbiota. The results indicated that bleach washes disrupted the internal tick microbiota in females, implying that bleach may have entered the tick and subsequently affected the microbiota. Furthermore, the analyses of results demonstrated that the ovary is a main source of tick microbiota, while the contribution of Gene's organ (a part of the female reproductive system that secretes a protective wax coat onto tick eggs) or the male's spermatophore requires further investigation. Further studies are needed to identify best practice protocols for the decontamination of ticks for microbiota studies.

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