Abstract:
:Adequate metabolic adaptation of key tissues playing an essential role for bioenergetic homeostasis and lactogenesis is critical in cows to adapt to changes in energy requirements and physiological processes during the lactation period. Mitochondria are recognized as central to meet energy needs and maintaining of metabolic homeostasis because mitochondrial DNA (mtDNA) is template for several polypeptides of the respiratory chain complexes essential for ATP generation. The quantity of mtDNA in a cell has been widely used as a surrogate marker for the capacity of cells for energy generation. In our study we analyzed the mtDNA copy number and the mRNA expression of important nuclear encoded genes controlling mitochondrial biogenesis in liver and mammary gland. We compared cows with a nuclear genome dairy × beef crossbred make-up to purebred German Holstein dairy cows. The study revealed tissue-specific variations of mtDNA copy number and expression levels of nuclear genes involved in mitochondrial biogenesis when comparing lactating cows with different genetic predisposition regarding milk performance. This may reflect nuclear genome-determined genetic differences between the cow groups in coping with metabolic demands and physiological changes during lactation. The results indicate that mitochondrial biogenesis processes in the liver and mammary gland appear to be impaired in high lactating dairy cows, which consequently, would point to a disturbed energy adaptation. The results provide a basis to further elucidate the adaptive and regulatory modulation of the mitochondrial biogenesis in response to lactation-associated metabolic challenges in lactating cows.
journal_name
Mol Biol Repjournal_title
Molecular biology reportsauthors
Weikard R,Kuehn Cdoi
10.1007/s11033-018-4273-xsubject
Has Abstractpub_date
2018-10-01 00:00:00pages
1209-1218issue
5eissn
0301-4851issn
1573-4978pii
10.1007/s11033-018-4273-xjournal_volume
45pub_type
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