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2014 ; 66
(7
): 1939-44
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gab.com Text
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In search of a candidate pathogen for giant cell arteritis: sequencing-based
characterization of the giant cell arteritis microbiome
#MMPMID24644069
Bhatt AS
; Manzo VE
; Pedamallu CS
; Duke F
; Cai D
; Bienfang DC
; Padera RF
; Meyerson M
; Docken WP
Arthritis Rheumatol
2014[Jul]; 66
(7
): 1939-44
PMID24644069
show ga
OBJECTIVE: To characterize the microbiome of the temporal artery in patients with
giant cell arteritis (GCA), and to apply an unbiased and comprehensive shotgun
sequencing-based approach to determine whether there is an enrichment of
candidate pathogens in the affected tissue. METHODS: Temporal artery biopsy
specimens were collected from patients at a single institution over a period of 4
years, and unbiased DNA sequencing was performed on 17 formalin-fixed,
paraffin-embedded specimens. Twelve of the 17 patients fulfilled the clinical and
histopathologic criteria for GCA, and the other 5 patients served as controls.
Using PathSeq software, human DNA sequences were computationally subtracted, and
the remaining non-human DNA sequences were taxonomically classified using a
comprehensive microbial sequence database. The relative abundance of microbes was
inferred based on read counts assigned to each organism. Comparison of the
microbial diversity between GCA cases and controls was carried out using
hierarchical clustering and linear discriminant analysis of effect size. RESULTS:
Propionibacterium acnes and Escherichia coli were the most abundant
microorganisms in 16 of the 17 samples, and Moraxella catarrhalis was the most
abundant organism in 1 control sample. Pathogens previously described to be
correlated with GCA were not differentially abundant in cases compared to
controls. There was not a significant burden of likely pathogenic viruses.
CONCLUSION: DNA sequencing of temporal artery biopsy specimens from GCA cases, in
comparison with non-GCA controls, showed no evidence of previously identified
candidate GCA pathogens. A single pathogen was not clearly and consistently
associated with GCA in this case series.