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Bovine host genome acts on rumen microbiome function linked to methane emissions
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Bovine host genome acts on rumen microbiome function linked to methane emissions
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Journal Article
Bovine host genome acts on rumen microbiome function linked to methane emissions
2022
Overview
Our study provides substantial evidence that the host genome affects the comprehensive function of the microbiome in the rumen of bovines. Of 1,107/225/1,141 rumen microbial genera/metagenome assembled uncultured genomes (RUGs)/genes identified from whole metagenomics sequencing, 194/14/337 had significant host genomic effects (heritabilities ranging from 0.13 to 0.61), revealing that substantial variation of the microbiome is under host genomic control. We found 29/22/115 microbial genera/RUGs/genes host-genomically correlated (|0.59| to |0.93|) with emissions of the potent greenhouse gas methane (CH
4
), highlighting the strength of a common host genomic control of specific microbial processes and CH
4
. Only one of these microbial genes was directly involved in methanogenesis (
cofG
), whereas others were involved in providing substrates for archaea (e.g.
bcd
and
pccB
), important microbial interspecies communication mechanisms (
ABC.PE.P
), host-microbiome interaction (
TSTA3
) and genetic information processes (
RP-L35
). In our population, selection based on abundances of the 30 most informative microbial genes provided a mitigation potential of 17% of mean CH
4
emissions per generation, which is higher than for selection based on measured CH
4
using respiration chambers (13%), indicating the high potential of microbiome-driven breeding to cumulatively reduce CH
4
emissions and mitigate climate change.
Metagenomes from 359 steers demonstrate a strong relationship between host genomics and microbial gene abundances, particularly those correlated with bovine emissions of methane.
