不同光色条件下京海黄鸡垂体转录组功能分析

Transcriptome analysis of pituitary gland of Jinghai Yellow Chicken under different light color conditions

  • 摘要: 【目的】对不同光色条件下京海黄鸡垂体进行转录组测序分析,了解不同光色条件下京海黄鸡垂体的表达谱,旨在筛选出红光影响京海黄鸡生殖激素合成的关键基因,为提高种鸡产蛋性能提供理论基础。【方法】红光组京海黄鸡产蛋量(90.61枚)显著高于白光组(87.44枚)(P<0.05)。选取红光和白光条件下京海黄鸡各3只,采集其垂体进行高通量测序,利用HISAT和DESeq等方法获得差异表达基因(DEGs)进行GO功能注释和KEGG信号通路富集分析。【结果】通过高通量测序获得4892794884~4980565639条Raw reads,比对到参考基因组的read比对率在92.00%以上,GC含量为48.54%~49.11%。将红光和白光条件下京海黄鸡的垂体进行比较,共获得155个DEGs,其中红光组与白光组(RP vs WP)相比,有90个基因表达上调和65个基因表达下调。对DEGs进行GO功能注释分析,主要在生物调控、细胞过程、细胞、细胞组分、连接和催化活性功能等重要生物途径。KEGG信号通路分析结果显示,DEGs主要富集在细胞因子—细胞因子受体相互作用、类固醇激素的生物合成通路、视黄醇的新陈代谢、花生四烯酸代谢、神经活性配体—受体相互作用等信号通路,这些通路中的促性腺激素释放激素基因(GNRH1)、分泌型磷蛋白1基因(SPP1)、信号转导蛋白1基因(SMAD1)、骨形态形成蛋白拮抗蛋白2抗体基因(GREM2)和表皮调节素基因(EREG)等表达可能受光色的影响,从而影响种鸡的产蛋性能。实时荧光定量PCR (qRT-PCR)结果证明了转录组测序结果准确可靠。【结论】与白光相比,红光能显著提高京海黄鸡的产蛋量。筛选获得的GNRH1、SPP1、SMAD1、GREM2EREG等基因可能在光色调控京海黄鸡产蛋性能中发挥重要作用,可作为种鸡垂体组织调控其产蛋性能分子机制研究的关键基因。

     

    Abstract: 【Objective】 The objective of this study was to analyze the transcriptome sequencing of pituitary glands of Jinghai Yellow Chickens under different light color conditions,to understand the expression profile of the pituitary glands of Jinghai Yellow Chickens under different light color conditions, to screen out the key genes of red light affecting the synthesis of reproductive hormones in Jinghai Yellow Chickens,so as to provide theoretical basis for improving the laying performance of breeding chickens.【Method】 The egg production of Jinghai Yellow Chickens in the red light group(90.61 eggs)was significantly higher than that of the white light group(87.44 eggs) (P<0.05). Three Jinghai Yellow Chickens each were selected under red light and white light conditions.The pituitary glands of chickens were sequenced through high-throughput sequencing. The differentially expressed genes(DEGs)were obtained by HISAT and DESeq methods, and GO functional annotation and KEGG signaling pathway enrichment analysis were performed.【Result】A total of 4892794884-4980565639 raw reads were obtained by high-throughput sequencing,with an alignment rate of over 92.12% and a GC content of 48.54%-49.11%. A total of 155 DEGs were obtained by comparing the pituitary glands of Jinghai Yellow Chickens under red and white lights, of which 90 gene expressions were up-regulated and 65 gene expressions were downregulated in the red light group compared with the white light group(RP vs WP). GO annotation analysis of DEGs was performed,mainly in important biological pathways such as biological regulation,cell process,cell,cell component, binding and catalytic activity. KEGG signaling pathway analysis suggested that DEGs were mainly enriched in the pathways of cytokine-cytokine receptor interaction,steroid hormone biosynthesis pathway,retinol metabolism,arachidonic acid metabolism,neuroactive ligand-receptor interaction signaling pathways. The expressions of gonadotropin releasing hormone(GNRH1),secreted phosphoprotein 1(SPP1),drosophila mothers against decapentaplegic protein(SMAD1), gremlin 2(GREM2)and Epiregulin(EREG)in these pathways may be affected by the light colors,which may affect the laying performance of breeding chickens. Furthermore,the results of real-time fluorescence quantitative PCR(qRT-PCR) confirmed that the transcrtiptome results were accurate and reliable.【Conclusion】Compared with white light,red light can significantly increase the egg production of Jinghai Yellow Chickens. The genes obtained from the screening,such as GNRH1,SPP1,SMAD1,GREM2 and EREG,may play important roles in the light color regulation of the laying performance of Jinghai Yellow Chickens,and can be used as key genes for the study of the molecular mechanism of pituitary gland tissue of breeding chickens to regulate their laying performance.

     

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