Investigating the cow skin and teat canal microbiomes of the bovine udder using different sampling and sequencing approaches
| Autor: | Luciano Caixeta, K.K. Crone, Christopher J Dean, Bradley J Heins, Noelle R. Noyes, A.X. Pfennig, Ilya B. Slizovskiy |
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| Rok vydání: | 2021 |
| Předmět: |
Veterinary medicine
animal structures Microbial DNA Shotgun Biology DNA sequencing Specimen Handling law.invention 03 medical and health sciences Mammary Glands Animal law RNA Ribosomal 16S Genetics medicine Animals Udder Polymerase chain reaction Skin 030304 developmental biology 0303 health sciences Bacteria Microbiota 0402 animal and dairy science 04 agricultural and veterinary sciences Amplicon Isolation (microbiology) 040201 dairy & animal science medicine.anatomical_structure Metagenomics Metagenome Cattle Female Animal Science and Zoology Food Science |
| Zdroj: | Journal of Dairy Science. 104:644-661 |
| ISSN: | 0022-0302 |
| Popis: | There is a need for standardized, efficient, and practical sampling methods to support large population-based studies of the internal and external epithelial microbiomes of the bovine udder. The primary objective of this study was to evaluate different sampling devices for the isolation of microbial DNA originating from the internal and external teat epithelium. Secondary objectives were to survey and compare the microbial diversity of external and teat canal epithelial microbiomes using amplicon and shotgun metagenomic sequencing approaches. To address these objectives, we enrolled a convenience sample of 24 Holstein dairy cows and collected samples from the external epithelium at the base of udder, the external teat barrel epithelium, the external teat apex epithelium, and the teat canal epithelium. Extracted DNA was quantified and subjected to PCR amplification of the V4 hypervariable region of the 16S rRNA gene and sequenced on the Illumina MiSeq platform (Illumina Inc., San Diego, CA). A subset of samples was subjected to a shallow shotgun metagenomic assay on the Illumina HiSeq platform. For samples collected from the external teat epithelium, we found that gauze squares consistently yielded more DNA than swabs, and Simpson's reciprocal index of diversity was higher for gauze than for swabs. The teat canal epithelial samples exhibited significantly lower diversity than the external sampling locations, but there were no significant differences in diversity between teat apex, teat barrel, and base of the udder samples. There were, however, differences in the microbial distribution and abundances of specific bacteria across external epithelial surfaces. The proportion of shotgun sequence reads classified as Bos taurus was highly variable between sampling locations, ranging from 0.33% in teat apex samples to 99.91% in teat canal samples. These results indicate that gauze squares should be considered for studying the microbiome of the external epithelium of the bovine udder, particularly if DNA yield must be maximized. Further, the relative proportion of host to non-host DNA present in samples collected from the internal and external teat epithelium should be considered when designing studies that utilize shotgun metagenomic sequencing. |
| Databáze: | OpenAIRE |
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