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Phylogenetic relationships among Ehrlichia ruminantium isolates.

M T E P Allsopp¹, H Van Heerden, H C Steyn

¹Onderstepoort Veterinary Institute, Onderstepoort 0110, South Africa. maria@ovisun.ovi.ac.za

Annals of the New York Academy of Sciences

|July 16, 2003

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Phylogenetic analysis of Ehrlichia ruminantium genes suggests its origin in southern Africa. This finding helps explain PCR test results in areas without clinical heartwater or known tick vectors.

Area of Science:

Veterinary Microbiology
Molecular Epidemiology
Tick-borne Pathogens

Background:

Ehrlichia ruminantium causes heartwater disease in ruminants across Africa and the Caribbean.
PCR tests for E. ruminantium can yield positive results even in areas lacking clinical signs or known tick vectors.

Purpose of the Study:

To investigate the molecular basis for discrepancies in E. ruminantium detection.
To determine the evolutionary origins and genetic diversity of E. ruminantium isolates.

Main Methods:

Sequencing of multiple E. ruminantium genes including pCS20, groESL, citrate synthase (gltA), and 16S ribosomal RNA.
Phylogenetic analysis of gene sequences to establish relationships among isolates.
Comparison of sequence variation across different gene regions and geographical isolates.

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Main Results:

16S rRNA sequences were highly conserved, except for the V1 loop region.
pCS20, groESL, and gltA genes showed single nucleotide polymorphisms (SNPs).
Phylogenetic analysis of pCS20 differentiated West African isolates into a distinct clade, suggesting southern Africa as the origin of E. ruminantium.

Conclusions:

Phylogenetic analysis provides insights into the geographical origins of E. ruminantium.
Understanding genetic diversity is crucial for interpreting diagnostic test results and disease epidemiology.