Genome-wide transcriptome analysis in the ovaries of two goats identifies differentially expressed genes related to fecundity

• Fecundity differences between 2 groups of goats were examined at the genomic level by RNA-seq.
• mRNA profiles are presented for 2 groups of goats.
• The differentially expressed mRNA uniquely define each group of goats.
• Quantitative real-time PCR verified the reliability of the RNA-Seq data.
• These data may lead to the identification of novel regulators of goat fecundity.

The goats are widely kept as livestock throughout the world. Two excellent domestic breeds in China, the Laiwu Black and Jining Grey goats, have different fecundities and prolificacies. Although the goat genome sequences have been resolved recently, little is known about the gene regulations at the transcriptional level in goat. To understand the molecular and genetic mechanisms related to the fecundities and prolificacies, we performed genome-wide sequencing of the mRNAs from two breeds of goat using the next-generation RNA-Seq technology and used functional annotation to identify pathways of interest. Digital gene expression analysis showed 338 genes were up-regulated in the Jining Grey goats and 404 were up-regulated in the Laiwu Black goats. Quantitative real-time PCR verified the reliability of the RNA-Seq data. This study suggests that multiple genes responsible for various biological functions and signaling pathways are differentially expressed in the two different goat breeds, and these genes might be involved in the regulation of goat fecundity and prolificacy. Taken together, our study provides insight into the transcriptional regulation in the ovaries of 2 species of goats that might serve as a key resource for understanding goat fecundity, prolificacy and genetic diversity between species.