Abstract
Many factors have been reported to affect rainbow trout egg quality, among which, postovulatory aging is one of the most significant causes as reared rainbow trout do not usually volitionally oviposit the ovulated eggs. In order to uncover the genetic regulation underling egg deterioration caused by postovulatory aging in rainbow trout, mitochondrial genome-encoded small RNA (mitosRNAs) were analyzed from unfertilized eggs on Days 1, 7, and 14 postovulation with fertilization rates of 91.8, 73.4, and less than 50Â %, respectively. A total of 248 mitosRNAs were identified from Illumina high-throughput sequencing of the small RNA libraries derived from the eggs of ten females. Ninety-eight of the small RNAs exhibited more than a threefold difference in expression between eggs from females exhibiting high fertilization rates at Day 1 and low fertilization rates at Day 14. The differentially expressed mitosRNAs were predominantly derived from mitochondrial D-loop, tRNA, rRNA, COII, and Cytb gene regions. Real-time quantitative PCR analysis was carried out for 14 differentially expressed mitosRNAs, of which, 12 were confirmed to be consistent with the sequencing reads. Further characterization of the differentially expressed mitosRNAs may lead to the development of new biomarkers for egg quality in rainbow trout.
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Acknowledgments
We thank Guangtu Gao, Mark Hostuttler, and Jill Birkett for technical assistance. This study was supported by the USDA-ARS Cooperative Agreement no. 58-1930-0-059. Mention of trade names is solely for the purpose of providing accurate information and should not imply product endorsement by the United States Department of Agriculture. USDA is an equal opportunity provider and employer.
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Table S1
MitosRNAs identified from the D1PO, D7PO, and D14PO samples. (DOCX 25Â kb)
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Ma, H., Weber, G.M., Wei, H. et al. Identification of Mitochondrial Genome-Encoded Small RNAs Related to Egg Deterioration Caused by Postovulatory Aging in Rainbow Trout. Mar Biotechnol 18, 584–597 (2016). https://doi.org/10.1007/s10126-016-9719-3
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DOI: https://doi.org/10.1007/s10126-016-9719-3
Keywords
- MitosRNA
- Egg quality
- Postovulation
- Rainbow trout