在RUNX1::RUNX1T1急性髓性白血病中合作MGA突变的功能性表征:
Melvin E Thomas1, Wenqing Qi1, Michael P Walsh1
1Department of Pathology, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Mail Stop 342, Memphis, TN, 38105, USA.
Leukemia
|March 7, 2024
概括
马克斯基因相关 (MGA) 转录因子的损失增强了正常的造血细胞增殖,加速了急性髓性白血病 (AML) 的发展. MGA突变破坏了它的功能,促进了细胞循环和AML中的瘤性途径.
科学领域:
- 血液学 血液学 血液学
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
背景情况:
- 马克斯基因关联 (MGA) 是一种转录因子,抑制了增殖并促进了分化.
- 在急性髓性白血病 (AML) 等血液性瘤中发现了MGA功能丧失突变.
- 对于MGA变化的血液形成和AML进展的确切影响尚不清楚.
研究的目的:
- 研究MGA突变在血液形成和AML中的功能后果.
- 阐明MGA损失影响细胞增殖和白血病发生的分子机制.
- 确定MGA在与RUNX1::RUNX1T1融合瘤基因合作中的作用.
主要方法:
- 分析患者衍生的MGA突变的蛋白质-蛋白质相互作用和转录活性.
- 利用了人类和小鼠模型系统,包括一种新的条件MGA淘汰小鼠.
- 在MGA缺陷模型中评估基因表达,信号通路 (MYC,E2F,mTOR),染色质状态和AML发展.
主要成果:
- MGA突变损害了其蛋白相互作用和MYC标的转录抑制.
- 造血细胞中MGA的损失可以调节MYC/E2F标,细胞循环基因,mTOR信号传递和氧化酸化,从而增强增殖.
- 缺乏MGA会导致在与增殖相关的基因促进体中产生开放的染色质状态.
- 在MGA缺乏细胞中的RUNX1T1表达导致更具侵略性的AML,发病速度更快.
结论:
- 在血液细胞中,MGA充当多种促增殖途径的关键调节者.
- MGA 损失与 RUNX1::RUNX1T1 融合瘤基因合作,驱动侵略性白血病发生.
- MGA是血液形成中的潜在瘤抑制剂,其无活化有助于AML的发病.
相关概念视频
01:20Mismatch Repair
4.8K
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
4.8K
01:31Translation
14.9K
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Proteins are...
Translation Produces the Building Blocks of Life
Proteins are...
14.9K
02:23Abnormal Proliferation
4.5K
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...
4.5K
01:35Mutations
37.3K
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
37.3K
02:41Lethal Alleles
15.4K
Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
15.4K
02:38The Ras Gene
6.2K
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a...
Ras is a...
6.2K