Abstract:
:MicroRNAs (miRNAs) are noncoding RNA molecules that regulate gene expression at the post-transcriptional level to cause translational repression or degradation of targets. The profiles of miRNAs across stages of lactation in small ruminant species such as dairy goats is unknown. A small RNA library was constructed using tissue samples from mammary gland of Saanen dairy goats harvested at mid-lactation followed by sequencing via Solexa technology. A total of 796 conserved miRNAs, 263 new miRNAs, and 821 pre-miRNAs were uncovered. After comparative analyses of our sequence data with published mammary gland transcriptome data across different stages of lactation, a total of 37 miRNAs (including miR-145) had significant differences in expression over the lactation cycle. Further studies revealed that miR-145 regulates metabolism of fatty acids in goat mammary gland epithelial cells (GMEC). Compared with nonlactating mammary tissue, lactating mammary gland had a marked increase in expression of miR-145. Overexpression of miR-145 increased transcription of genes associated with milk fat synthesis resulting in greater fat droplet formation, triacylglycerol accumulation, and proportion of unsaturated fatty acids. In contrast, silencing of miR-145 impaired fatty acid synthesis. Inhibition of miR-145 increased methylation levels of fatty acid synthase (FASN), stearoyl-CoA desaturase 1 (SCD1), peroxisome proliferator-activated receptor gamma (PPARG), and sterol regulatory element binding transcription factor 1 (SREBF1). Luciferase reporter assays confirmed that insulin induced gene 1 (INSIG1) is a direct target of miR-145. These findings underscore the need for further studies to evaluate the potential for targeting miR-145 for improving beneficial milk components in ruminant milk. J. Cell. Physiol. 232: 1030-1040, 2017. © 2016 Wiley Periodicals, Inc.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Wang H,Shi H,Luo J,Yi Y,Yao D,Zhang X,Ma G,Loor JJdoi
10.1002/jcp.25499subject
Has Abstractpub_date
2017-05-01 00:00:00pages
1030-1040issue
5eissn
0021-9541issn
1097-4652journal_volume
232pub_type
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journal_title:Journal of cellular physiology
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