Identification and molecular analysis of cashmere goat lncRNAs reveal their integrated regulatory network and potential roles in secondary hair follicle.

Long non-coding RNAs (lncRNAs) is a class of eukaryotic transcripts with length of more than 200 bp. They contribute to the regulation of gene expressions involved in multiple processes including the skin cell proliferation, differentiation, and reconstruction of the secondary hair follicles (SHFs). In this study, firstly, we identified 16 putative lncRNAs from SHFs of cashmere goat based on the EST sequences from NCBI database. Secondly, we investigated their transcriptional pattern in SHFs of cashmere goat, and constructed their ceRNA regulatory networks. The RT-qPCR results showed four lncRNAs (lncRNA-475074, -052149, -052140, and -051789) were significantly up-regulated, and nine lncRNAs (lncRNA-711032, -475083, -475070, -052139, -052127, -052037, -051903, -051847, and -051804) were significantly down-regulatd in anagen SHFs of cashmere goat. CeRNA networks analysis revealed complex interactional relationship among lncRNAs, miRNAs and mRNAs. Further, the KEGG pathway enrichment was performed for the potential target genes of the identified lncRNAs based on bioinformatics technique, and the results indicated that differentially expressed lncRNAs directly or indirectly might regulate potential target genes. Our results from this study will provide a significant information for further exploring the functions and possible mechanisms of the identified lncRNAs in SHFs of cashmere goat.