Document Detail

Deep RNA Sequencing Reveals that MicroRNAs Play a Key Role in Lactation in Rats.
MedLine Citation:
PMID:  24899157     Owner:  NLM     Status:  Publisher    
Understanding the regulatory contribution of maternal physiology to difficulties with lactation is beneficial to both mother and infant. MicroRNAs (miRNAs) regulate mammary gland development and function through mRNA. In the present study, a deep RNA sequencing (RNA-seq) technique was used to compare the expression profile of miRNAs and mRNAs of 2 pooled RNA samples (n = 1) from day 1 and day 7 postpartum rat (Rattus norvegicus) mammary glands to identify key miRNAs and their target genes that may control the rate-limiting steps of lactation. A total of 395 and 400 known miRNAs were identified in days 1 and 7 postpartum rat mammary samples, respectively. Compared with day 1 postpartum, 27 miRNAs were differentially expressed at day 7 postpartum. The expression differences between lactation periods were further analyzed by real-time quantitative polymerase chain reaction (qPCR) (n = 5). The downregulated miRNA families, including rno-miR-30, rno-miR-1, rno-miR-145-3p, rno-miR-142, rno-miR-7a-5p, rno-miR-3571, rno-miR-224-5p, rno-miR-362-5p, rno-miR-342-3p, rno-miR-322-3p, rno-miR-18a-5p, and rno-miR-202-5p, expressed with ΔΔCt [change in cycle threshold (ΔCt) on day 7 - ΔCt on day 1] values varying from 0.64 to 9.44; the upregulated miRNA families, including rno-miR-133, rno-miR-190a-5p, rno-miR-27a-5p, rno-miR-451-5p, rno-miR-3120, rno-miR-23a-5p, rno-miR-20a-3p, rno-miR-92a-1-5p, and rno-miR-134-5p, expressed with ΔΔCt values varying from -1.02 to -4.37 (P < 0.05). The intersection of the expressed mRNA genes from RNA-seq and putative target genes of differentially expressed miRNAs, termed mammary gland target genes (MTGs), was analyzed. The result indicated that 1259 MTGs overlapped between the 2 gene sets. The expression of 14 randomly selected genes of the MTGs was further confirmed by real-time qPCR (R(2) = 0.86, P < 0.01). The MTGs are highly enriched for lipid biosynthetic process. This gene cluster included 24 lipid metabolic process-related genes, which were putative targets of 10 differentially expressed miRNAs. These results will be helpful in discovering the biologic underpinnings of poor lactation performance in women attempting to breastfeed.
ChunLei Zhang; YuLong Zhao; YanHong Wang; Hui Wu; XingTang Fang; Hong Chen
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-6-4
Journal Detail:
Title:  The Journal of nutrition     Volume:  -     ISSN:  1541-6100     ISO Abbreviation:  J. Nutr.     Publication Date:  2014 Jun 
Date Detail:
Created Date:  2014-6-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404243     Medline TA:  J Nutr     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2014 American Society for Nutrition.
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