卵巢成熟期和退化期星斑川鲽脑垂体和下丘脑组织的转录组比较分析

COMPARISON ANALYSIS ON TRANSCRIPTOME IN THE PITUITARY GLAND AND HYPOTHALAMUS OF STARRY FLOUNDER (PLATICHTHYS STELLATUS) AT THE OVARY MATURATION AND DEGRADATION STAGES

  • 摘要: 为了解星斑川鲽(Starry Flounder,Platichthys stellatus)脑组织基因表达与卵巢发育调控的关系,发掘相关功能基因,研究提取卵巢成熟期和退化期星斑川鲽雌鱼脑垂体和下丘脑组织总RNA,运用HiSeq 2000高通量测序技术进行转录组测序分析。测序结果经拼接组装后共获得30640条Unigenes,Blast同源性比对显示,其中24128条Unigenes获得注释;经eggNog功能注释后29137条Unigenes序列分为26类,分别涉及信号转导、翻译机制等生理生化过程。KEGG pathway数据比对显示,卵巢成熟期涉及98种代谢途径,135条序列表达上调;卵巢退化期涉及192种代谢途径,648条序列表达上调。Unigenes表达量及表达差异分析表明在卵巢成熟期334条序列表达上调,卵巢退化期987条序列表达上调。获得功能注释的Unigene中,408条涉及生殖调控和内分泌调控,参与生殖调控的信号分子有1508条。试验采用实时定量PCR研究了涉及生殖调控和内分泌调控基因促性腺激素释放激素(GnRH)、神经激肽B(NKB)、促性腺激素(GtH)、促滤泡激素(FSH)、肿瘤转移抑制因子(Kiss)以及催乳素释放肽受体(PrRPR)在卵巢两个不同发育时期脑垂体和下丘脑的表达情况,结果表明除FSH外,其余均在卵巢退化期时期脑组织中表达升高,与转录组测序结果趋势一致。

     

    Abstract: To investigate the relationship of genes expression between brain tissue and ovary development, and explore more functional genes of Platichthys stellatus, total RNA from the mixed sample of pituitary gland and hypothalamus at the ovary maturation and degradation stages were isolated and sequenced by HiSeq 2000 high throughput sequencing technology. After assembly and splicing, 24128 unigenes from a total of 30640 unigenes were annotated based on the blast homology alignment. All 29137 unigenes with eggNog annotations were divided into 26 categories that were involved in physiological processes, such as signaling transduction, translation mechanism, etc. The results from KEGG pathway analysis showed that all unigenes at the ovary maturation stage were involved in metabolic pathways with 135 up-regulated sequences, while the unigenes at the ovary degradation stage were associated with 192 metabolic pathways with 648 up-regulated sequences. Moreover, 334 differentially expressed genes (DEGs) were up-regulated at the ovary maturation stage, while 987 up-regulated DEGs were observed at the ovary degradation stage. Total 408 unigenes were involved in reproductive and endocrine regulation, and 1508 unigenes were involved in signaling molecules. The expression of some reproduction-associated DEGs including growth hormone releasing hormone (GnRH), neurokinin B (NKB), gonadotropin (GtH), follicle stimulating hormone (FSH), kisspeptin (Kiss), and prolactin-relea-sing peptide receptor (PrRPR) were verified by qRT-PCR. All genes except FSH were consistent with the results of the transcriptome sequencing.

     

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