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Data from a proteomic baseline study of Assemblage A in Giardia duodenalis.

ABSTRACT: Eight Assemblage A strains from the protozoan parasite Giardia duodenalis were analysed using label-free quantitative shotgun proteomics, to evaluate inter- and intra-assemblage variation and complement available genetic and transcriptomic data. Isolates were grown in biological triplicate in axenic culture, and protein extracts were subjected to in-solution digest and online fractionation using Gas Phase Fractionation (GPF). Recent reclassification of genome databases for subassemblages was evaluated for database-dependent loss of information, and proteome composition of different isolates was analysed for biologically relevant assemblage-independent variation. The data from this study are related to the research article "Quantitative proteomics analysis of Giardia duodenalis Assemblage A - a baseline for host, assemblage and isolate variation" published in Proteomics (Emery et al., 2015 [1]).

SUBMITTER: Emery SJ

PROVIDER: S-EPMC4556777 | biostudies-literature | 2015 Dec

REPOSITORIES: biostudies-literature

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Data from a proteomic baseline study of Assemblage A in Giardia duodenalis.

Emery Samantha J SJ Lacey Ernest E Haynes Paul A PA

Data in brief 20150819

Eight Assemblage A strains from the protozoan parasite Giardia duodenalis were analysed using label-free quantitative shotgun proteomics, to evaluate inter- and intra-assemblage variation and complement available genetic and transcriptomic data. Isolates were grown in biological triplicate in axenic culture, and protein extracts were subjected to in-solution digest and online fractionation using Gas Phase Fractionation (GPF). Recent reclassification of genome databases for subassemblages was eva ...[more]

PMID: 26380841

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Project description:BACKGROUND: Giardia duodenalis is highly endemic in East Africa but its effects on child health, particularly of submicroscopic infections, i.e., those below the threshold of microscopy, and of genetic subgroups (assemblages), are not well understood. We aimed at addressing these questions and at examining epidemiological characteristics of G. duodenalis in southern highland Rwanda. METHODOLOGY/PRINCIPAL FINDINGS: In 583 children <5 years of age from communities and health facilities, intestinal parasites were assessed by triplicate light microscopy and by PCR assays, and G. duodenalis assemblages were genotyped. Cluster effects of villages were taken into account in statistical analysis. The prevalence of G. duodenalis as detected by microscopy was 19.8% but 60.1% including PCR results. Prevalence differed with residence, increased with age, and was reduced by breastfeeding. In 492 community children without, with submicroscopic and with microscopic infection, underweight (weight-for-age z-score <-2 standard deviations) was observed in 19.7%, 22.1%, and 33.1%, respectively, and clinically assessed severe malnutrition in 4.5%, 9.5%, and 16.7%. Multivariate analysis identified microscopically detectable G. duodenalis infection as an independent predictor of underweight and clinically assessed severe malnutrition. Submicroscopic infection showed respective trends. Overall, G. duodenalis was not associated with gastrointestinal symptoms but assemblages A parasites (proportion, 13%) were increased among children with vomiting and abdominal pain. CONCLUSIONS/SIGNIFICANCE: The prevalence of G. duodenalis in high-endemicity areas may be greatly underestimated by light microscopy, particularly when only single stool samples are analysed. Children with submicroscopic infections show limited overt manifestation, but constitute unrecognized reservoirs of transmission. The predominance of assemblage B in Rwanda may be involved in the seemingly unimposing manifestation of G. duodenalis infection. However, the association with impaired child growth points to its actual relevance. Longitudinal studies considering abundant submicroscopic infections are needed to clarify the actual contribution of G. duodenalis to morbidity in areas of high endemicity.

Dataset Information

Data from a proteomic baseline study of Assemblage A in Giardia duodenalis.

Publications

Data from a proteomic baseline study of Assemblage A in Giardia duodenalis.

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