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重庆医科大学基础医学院医学表观遗传学研究中心,重庆 400016
文禹婷,Email:wenyuting678@163.com,研究方向:胚胎发育。
向云龙,Email:xiangyunlong1987@163.com。
收稿:2025-01-14,
修回:2025-03-11,
纸质出版:2026-06-28
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文禹婷,申喜鹏,李文思等.转录因子SP1靶向发育基因调控小鼠胚胎发育[J].重庆医科大学学报,2026,51(06):844-849.
Wen Yuting,Shen Xipeng,Li Wensi,et al.Transcription factor SP1 regulates mouse embryonic development by targeting developmental genes[J].Journal of Chongqing Medical University,2026,51(06):844-849.
文禹婷,申喜鹏,李文思等.转录因子SP1靶向发育基因调控小鼠胚胎发育[J].重庆医科大学学报,2026,51(06):844-849. DOI: 10.13406/j.cnki.cyxb.003833.
Wen Yuting,Shen Xipeng,Li Wensi,et al.Transcription factor SP1 regulates mouse embryonic development by targeting developmental genes[J].Journal of Chongqing Medical University,2026,51(06):844-849. DOI: 10.13406/j.cnki.cyxb.003833.
目的
2
探究转录因子特异性蛋白1(specificity protein 1,SP1)对小鼠植入后胚胎发育的转录调控机制。
方法
2
收集受精后第7.5天的小鼠植入后早期胚胎,利用胚层分离技术获取外胚层(ectoderm,Ect)、中胚层(mesoderm,Mes)、内胚层(endoderm,End)、原条(primitive streak,PS)与胚外外胚层(extraembryonic ectoderm,ExE)组织;采用染色质免疫共沉淀测序(chromatin immunoprecipitation-sequencing,ChIP-seq)检测SP1在基因组的分布情况;利用CRISPR/Cas9基因编辑结合受精卵电转核酸酶(zygote electroporation of nucleases,ZEN)技术制备
Sp1
敲除的胚胎;采用Smart-seq2检测胚胎的mRNA表达水平并分析对照组与
Sp1
敲除的胚胎中各胚层的差异表达基因(differentially expressed genes,DEGs);采用基因本体(gene ontology,GO)富集分析对DEGs进行功能聚类;结合ChIP-seq和RNA-seq数据鉴定SP1调控各胚层发育的潜在下游基因。
结果
2
SP1在各胚层中均有表达,其信号峰大量富集于基因启动子区,在基因主体与基因间区分布较少;敲除
Sp1
导致RNA表达变化的基因数目在Mes、ExE中较多,功能聚类显示其中表达下调的基因与器官发育、形态发生以及血管生成等生物学进程相关;进一步结合SP1的基因组分布,鉴定出SP1调节胚层发育的潜在关键靶基因,如
Gbx2
、
Vim
等。
结论
2
SP1结合胚层特异性的发育基因启动子,可能通过调控其转录水平进而影响胚层分化。
Objective
2
To investigate transcriptional regulatory mechanisms by which the transcription factor specificity protein 1 (SP1) regulates post-implantation embryonic development in mice.
Methods
2
Early-stage post-implantation mouse embryos 7.5 days after fertilization were collected. Embryonic germ layer separation techniques were employed to isolate the ectoderm(Ect),mesoderm (Mes),endoderm(End),primitive streak(PS),and extra-embryonic ectoderm(ExE). Chromatin immunoprecipitation sequencing (ChIP-seq) was performed to map the genome-wide binding profile of SP1.
Sp1
-deficient embryos were prepared through CRISPR/Cas9-mediated gene editing coupled with zygote electroporation of nucleases. Smart-seq2 was applied for embryonic mRNA profiling and identification of differentially expressed genes(DEGs) across the embryonic layers between control and
Sp1
-deficient embryos. Gene Ontology enrichment analysis was conducted to cluster DEGs by function. Finally,ChIP-seq and RNA-seq datasets were combined to identify potential downstream targets regulated by SP1 during embryonic layer development.
Results
2
SP1 was expressed across all the embryonic layers,with its binding sites predominantly enriched in promoter regions while less abundant in gene bodies and intergenic regions.
Sp1
knockout led to a greater number of genes with altered RNA expression in the Mes and ExE. The GO analysis revealed that the downregulated genes were involved in organ development,morphogenesis,and angiogenesis. With the genome-wide SP1 binding profile,potential key targets regulated by SP1 in embryonic layer development were identified,which included
Gbx2
and
Vim
.
Conclusion
2
SP1 binds to the promoters of germ layer-specific developmental genes,potentially modulating their transcriptional activity and thereby influencing embryonic layer specification.
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