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Published on: June 27, 2017
对于维持CpXpG甲基化,需要CHROMOMETHYLASE3
A M Lindroth1, X Cao, J P Jackson
1Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, CA 90095, USA.
概括
阿拉比多普西斯超人位沉默涉及密集的超甲基化在非正规的细胞因子. 在CHROMOMETHYLASE3 (CMT3) 中的功能丧失突变减少了这种甲基化,重新激活了基因表达并揭示了CMT3.
科学领域:
- 植物分子生物学 植物分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 遗传学 是一个遗传学.
背景情况:
- 阿拉比多opsis SUPERMAN (SUP) 位表现出通过密集的高甲基化在非正规细胞因子 (CpXpG和不对称位点) 的表观遗传沉默.
- 了解维持这种表观遗传沉默的机制对于植物发育和基因调节至关重要.
研究的目的:
- 为了确定参与维护非正规细胞因子甲基化在沉默的阿拉比多普西斯SUP位点的基因.
- 阐明新型甲基转移酶在表观遗传基因沉默中的作用.
主要方法:
- 使用基因选来识别SUP的超甲基化克拉克·肯特突变等位基因的抑制剂.
- 鉴定和描述了CHROMOMETHYLASE3 (CMT3) 的功能丧失等位基因.
- 在cmt3突变体中分析了SUP基因和其他基因组序列的CpXpG甲基化水平.
- 在cmt3突变体中监测了内源逆转移体的表达.
主要成果:
- 鉴定出9个功能丧失的CHROMOMETHYLASE3 (CMT3) 的等位基因,该等位基因基因基因基因转移酶的新型同类基因,被认为是抑制剂.
- cmt3突变显示SUP基因和全基因组的CpXpG甲基化减少.
- 在cmt3突变体中观察到内源逆转移体的重新激活表达.
- 尽管有甲基化变化,但cmt3突变体表现出野生类型的形态.
结论:
- 染色甲基酶3 (CMT3) 是一种非CpGDNA甲基转移酶,负责维持表观遗传基因沉默.
- CMT3在全基因组甲基化模式和可转移元素的调节中发挥着重要作用.
- 准CMT3为操纵植物表观遗传沉默提供了一个潜在的策略.
相关概念视频
Epigenetic Regulation
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Euchromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
Chromatin Immunoprecipitation- ChIP
Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
Types of ChIP
ChIP can be divided into two types - X-ChIP and N-ChIP. X-ChIP involves in vivo cross-linking of histones and regulatory proteins to DNA, fragmenting the DNA by sonication, and isolating the protein-DNA...
Heterochromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...

