在脊椎动物中剂量补偿的转录后调节机制
Nicholas C Lister1, Kim L McIntyre1, Paul D Waters1
1School of Biotechnology and Biomolecular Sciences, Faculty of Science, UNSW Sydney, Sydney, NSW 2052, Australia.
Reproduction, fertility, and development
|December 3, 2025
概括
在具有不同性染色体的物种中,剂量补偿不仅仅依赖于基因转录. 像NMD,m6A和miRNA这样的后转录机制对于平衡蛋白质组中的基因剂量至关重要.
科学领域:
- 遗传学和基因组学 在
- 分子生物学分子生物学
- 进化生物学 进化生物学
背景情况:
- 性染色体剂量补偿在异形性染色体的物种中至关重要.
- 转录调节一直被认为是恢复基因剂量平衡的主要机制.
- 新出现的证据强调了脊椎动物中转录后调节的重要作用.
研究的目的:
- 探讨在蛋白质组中促进X/Z基因剂量平衡的转录后机制.
- 提出潜在的调节机制,包括无意中介衰变 (NMD),N6-甲基氨酸RNA甲基化 (m6A) 和性别特定的微RNA (miRNA).
- 强调性别染色体剂量的多层调节是一种古老而广泛的策略.
主要方法:
- 关于基因剂量补偿的现有文献的审查和综合.
- 特定的转录后调节途径 (NMD,m6A,miRNAs) 的识别和建议.
- 跨脊椎动物谱系进行比较分析,以支持拟议机制的普遍性.
主要成果:
- 转录后机制在平衡X/Z基因剂量在蛋白质层面上起到关键作用.
- 无意中介衰变 (NMD),m6ARNA甲基化和性别特定的miRNA被确定为关键调节者.
- 有证据表明,多层次的剂量补偿是一种古老而保存的策略.
结论:
- 转录后过程在剂量补偿中的作用重新定义了目前对这种生物过程的理解.
- 通过转录后控制的镜头揭示了调节发育,繁殖和疾病的新机制.
- 对剂量补偿的全面看法需要整合转录和后转录的监管层.
相关概念视频
Dosage Compensation
7.0K
In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will...
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will...
7.0K
Regulation of Expression at Multiple Steps
1.3K
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
1.3K
Regulation of Expression Occurs at Multiple Steps
25.6K
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
25.6K
Regulation of Expression Occurs at Multiple Steps
3.8K
3.8K
What is Gene Expression?
10.8K
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then...
10.8K
What is Gene Expression?
194.1K
Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
194.1K


