IDH1突变足以确定质瘤高甲基化剂表型
Sevin Turcan1, Daniel Rohle, Anuj Goenka
1Human Oncology and Pathogenesis Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10065, USA.
Nature
|February 21, 2012
概括
异酸脱酶1 (IDH1) 突变通过改变甲基组和转录组,驱动质瘤中的CpG岛甲基器表型 (CIMP). 这一发现澄清了质瘤CIMP的分子基础及其对癌症发展和患者存活率的影响.
科学领域:
- 在瘤学瘤学.
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因组学就是基因组学.
背景情况:
- 癌症的发展涉及复杂的遗传和表观遗传变化,但它们的相互作用仍然不清楚.
- 包括质瘤在内的CpG岛甲基化器表型 (CIMP) 癌症表现出显著的表观基因组变化和独特的生物学特征.
- 质瘤CIMP (G-CIMP) 的分子驱动因素及其在瘤病原性中的作用尚未完全理解.
研究的目的:
- 研究G-CIMP的分子基础及其与基因组改变的关系.
- 确定异酸脱酶1 (IDH1) 突变是否负责确定G-CIMP表型.
- 了解IDH1突变如何影响表观基因组,转录基因组和质瘤的临床结果.
主要方法:
- 在一大群中等等级质瘤中对表观基因组的分析.
- 引入突变的IDH1进入人类初级星体细胞以建模G-CIMP.
- 评估DNA甲基化,基因素修饰和基因表达变化.
主要成果:
- 鉴定出IDH1突变是质瘤中G-CIMP表型的关键决定因素.
- 突变IDH1诱导了DNA高甲基化,并重塑了甲基组,反映了G-CIMP质瘤的变化.
- 由突变IDH1驱动的表观基因组变化激活了特定的基因表达程序,并与proneural glioblastomas的生存率改善有关.
结论:
- IDH1突变是质瘤中CIMP的基本分子原因.
- 这一发现为了解IDH突变质瘤的瘤发生提供了一个框架.
- 这项研究强调了基因组突变和癌症中的表观基因组失调之间的关键相互作用.
相关概念视频
Epigenetic Regulation
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
Epigenetic Regulation
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Genomic Imprinting and Inheritance
Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
Phase II Reactions: Methylation Reactions
Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
The mechanism of methylation unfolds in two stages. The first stage sees a methyltransferase enzyme facilitating the transfer of a methyl group from S-adenosylmethionine (SAM) to the substrate, forming S-adenosylhomocysteine (SAH). The second stage involves further metabolism of SAH into homocysteine, which can be recycled...
The mechanism of methylation unfolds in two stages. The first stage sees a methyltransferase enzyme facilitating the transfer of a methyl group from S-adenosylmethionine (SAM) to the substrate, forming S-adenosylhomocysteine (SAH). The second stage involves further metabolism of SAH into homocysteine, which can be recycled...
Abnormal Proliferation
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
Chromatin Modification in iPS Cells
Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
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