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Wolbachia infection in the newly described Ecuadorian sand flea, Tunga trimamillata

Andrea Luchetti1, Barbara Mantovani, Maria Letizia Fioravanti

  • 1Dipartimento di Biologia Evoluzionistica Sperimentale, Università di Bologna, Bologna, Italy. barman@alma.unibo.it

Experimental Parasitology
|October 20, 2004
PubMed

Insights

A new Wolbachia strain was found in 35% of Tunga trimamillata sand-fleas, potentially causing a female-biased sex ratio. This distinct strain was absent in related Tunga penetrans.

Area of Science:

  • Microbiology
  • Genetics
  • Parasitology

Background:

  • Wolbachia pipientis are intracellular bacteria known to cause reproductive alterations in hosts.
  • They are commonly found in arthropods and nematodes.
  • Previous studies have reported Wolbachia in various species, but its presence in Tunga trimamillata was unconfirmed.

Purpose of the Study:

  • To identify Wolbachia presence and characteristics in the sand-flea Tunga trimamillata.
  • To investigate the prevalence of Wolbachia in T. trimamillata and related Tunga penetrans.
  • To explore the potential impact of Wolbachia on the sex ratio of T. trimamillata.

Main Methods:

  • Polymerase Chain Reaction (PCR) amplification and sequencing of 16S rDNA and ftsZ genes.
  • Screening of 26 T. trimamillata individuals for Wolbachia.
  • Analysis of 24 T. penetrans specimens for comparison.
  • BLAST search and phylogenetic analysis to characterize the identified Wolbachia strain.

Main Results:

  • Wolbachia was detected in 35% (9 out of 26) of the screened T. trimamillata individuals.
  • No Wolbachia infection was found in the analyzed T. penetrans specimens, contrary to some literature.
  • Field observations indicated a female-biased sex ratio in T. trimamillata populations.
  • Phylogenetic analysis revealed the T. trimamillata Wolbachia strain is distinct and belongs to the arthropod-infecting group, differing significantly from T. penetrans Wolbachia.

Conclusions:

  • A novel, highly differentiated Wolbachia strain infects Tunga trimamillata.
  • This endosymbiont is a likely cause of the observed female-biased sex ratio in T. trimamillata.
  • The absence of Wolbachia in the analyzed T. penetrans suggests host specificity or varying prevalence patterns.

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