The existence of circular RNAs (circRNAs) was demonstrated over 30 years ago. They did not gain much interest at the time because they appeared to be relatively rare when compared to the abundance of the canonical lin...The existence of circular RNAs (circRNAs) was demonstrated over 30 years ago. They did not gain much interest at the time because they appeared to be relatively rare when compared to the abundance of the canonical linear RNAs. However, more recent evidence suggests that circRNAs are abundant in cells and tissues and possess intriguing biological properties. These recent developments have renewed our interest in this novel class of molecules. This report will provide an overview of circRNAs, discuss how they may modify our understanding of gene regulation and indicate their most likely relevance to health. The circRNAs from viruses, bacteria and archaea are not in the scope of this report, and we focused this review on circRNAs in eukaryotes.展开更多
Circular RNAs(circRNAs),a new star of noncoding RNAs,are a group of endogenous RNAs that form a covalently closed circle and occur widely in the mammalian genome.Most circRNAs are conserved throughout species and fre-...Circular RNAs(circRNAs),a new star of noncoding RNAs,are a group of endogenous RNAs that form a covalently closed circle and occur widely in the mammalian genome.Most circRNAs are conserved throughout species and fre-quently show stage-specific expression during various stages of tissue develop-ment.CircRNAs were a mystery discovery,as they were initially believed to be a product of splicing errors;however,subsequent research has shown that ci-rcRNAs can perform various functions and help in the regulation of splicing and transcription,including playing a role as microRNA(miRNA)sponges.With the application of high throughput next-generation technologies,circRNA hotspots were discovered.There are emerging indications that explain the association of circRNAs with human diseases,like cancers,developmental disorders,and in-flammation,and circRNAs may be a new potential biomarker for the diagnosis and treatment outcome of various diseases,including cancer.After the discoveries of miRNAs and long noncoding RNAs,circRNAs are now acting as a novel re-search entity of interest in the field of RNA disease biology.In this review,we aim to focus on major updates on the biogeny and metabolism of circRNAs,along with their possible/established roles in major human diseases.展开更多
目的建立microRNA失功能(loss of function)研究模型,为功能研究提供实验材料。方法针对miR-483-5p成熟体序列设计含6个拷贝反义序列的DNA片段,称为"S-483",将其连接入含CAG启动子的pCAGGs载体中,构建pCAGGs-S-483重组质粒。...目的建立microRNA失功能(loss of function)研究模型,为功能研究提供实验材料。方法针对miR-483-5p成熟体序列设计含6个拷贝反义序列的DNA片段,称为"S-483",将其连接入含CAG启动子的pCAGGs载体中,构建pCAGGs-S-483重组质粒。利用脂质体技术瞬时转染Hep1-6细胞,经re-al-time PCR对成熟miR-483-5p含量进行检测。结果转染pCAGGs-S-483组miRNA-483含量(0.33±0.04)较转染空质粒组(1.00)明显下降(P<0.01),但对其它miRNAs无影响。结论 S-483海绵策略可有效"吸附"并降低miR-483-5p,成功构建了pCAGGs-S-483重组质粒,为其功能研究和miRNA敲减动物的建立提供了有益借鉴。展开更多
文摘The existence of circular RNAs (circRNAs) was demonstrated over 30 years ago. They did not gain much interest at the time because they appeared to be relatively rare when compared to the abundance of the canonical linear RNAs. However, more recent evidence suggests that circRNAs are abundant in cells and tissues and possess intriguing biological properties. These recent developments have renewed our interest in this novel class of molecules. This report will provide an overview of circRNAs, discuss how they may modify our understanding of gene regulation and indicate their most likely relevance to health. The circRNAs from viruses, bacteria and archaea are not in the scope of this report, and we focused this review on circRNAs in eukaryotes.
文摘Circular RNAs(circRNAs),a new star of noncoding RNAs,are a group of endogenous RNAs that form a covalently closed circle and occur widely in the mammalian genome.Most circRNAs are conserved throughout species and fre-quently show stage-specific expression during various stages of tissue develop-ment.CircRNAs were a mystery discovery,as they were initially believed to be a product of splicing errors;however,subsequent research has shown that ci-rcRNAs can perform various functions and help in the regulation of splicing and transcription,including playing a role as microRNA(miRNA)sponges.With the application of high throughput next-generation technologies,circRNA hotspots were discovered.There are emerging indications that explain the association of circRNAs with human diseases,like cancers,developmental disorders,and in-flammation,and circRNAs may be a new potential biomarker for the diagnosis and treatment outcome of various diseases,including cancer.After the discoveries of miRNAs and long noncoding RNAs,circRNAs are now acting as a novel re-search entity of interest in the field of RNA disease biology.In this review,we aim to focus on major updates on the biogeny and metabolism of circRNAs,along with their possible/established roles in major human diseases.
文摘目的建立microRNA失功能(loss of function)研究模型,为功能研究提供实验材料。方法针对miR-483-5p成熟体序列设计含6个拷贝反义序列的DNA片段,称为"S-483",将其连接入含CAG启动子的pCAGGs载体中,构建pCAGGs-S-483重组质粒。利用脂质体技术瞬时转染Hep1-6细胞,经re-al-time PCR对成熟miR-483-5p含量进行检测。结果转染pCAGGs-S-483组miRNA-483含量(0.33±0.04)较转染空质粒组(1.00)明显下降(P<0.01),但对其它miRNAs无影响。结论 S-483海绵策略可有效"吸附"并降低miR-483-5p,成功构建了pCAGGs-S-483重组质粒,为其功能研究和miRNA敲减动物的建立提供了有益借鉴。
