一个新的生殖系过活化的JAK2突变L604F
Lukáš Dvořáček1, Jana Marková2, Aleš Holoubek1
1Department of Proteomics, Institute of Hematology and Blood Transfusion, Prague, Czech Republic.
Annals of hematology
|August 28, 2023
概括
在多细胞真菌 (PV) 患者中发现了一种新的生殖系JAK2突变 (L604F),增强了JAK2激酶活性. 这一发现为光伏病原和潜在的治疗点提供了新的见解.
科学领域:
- 分子生物学分子生物学
- 血液学 血液学 血液学
- 遗传学 是一个遗传学.
背景情况:
- 人体JAK2突变,特别是V617F,是多细胞真血 (PV) 的主要原因.
- V617F突变增强了JAK2二分体的稳定性和激酶活性.
- 生殖系JAK2突变可以调节V617F的影响,但通常不会显著改变单独的JAK2信号.
研究的目的:
- 为了研究一个不寻常的生殖系JAK2突变的功能后果,L604F,在一个年轻的PV患者和她的家人中发现.
- 为了比较L604F与V617F突变对JAK2信号传递的影响.
- 阐明L604F影响JAK2二聚体形成和活性的机制.
主要方法:
- 在表达异源JAK2-GFP的HEK293T细胞中对JAK2 L604F和V617F突变的功能分析.
- 在HeLa细胞中对内源JAK2进行CRISPR/Cas9介导的修饰,以评估突变效应.
- 在具有不同JAK2突变的细胞中比较JAK2激酶活性和蛋白质水平.
主要成果:
- 两种JAK2 L604F和V617F突变都显著增加了HEK293T细胞中构成性的JAK2激酶活性.
- 与V617F不同的是,由JAK2 L604F诱导的过活化只被F595的氨酸替代部分抑制,而不是V617F.
- 在HeLa细胞中的内源JAK2修饰导致了总JAK2蛋白水平的降低.
结论:
- 生殖系JAK2 L604F突变有助于JAK2过活化,可能是通过增加自发二次体形成和稳定二次体.
- L604F可能在PV病变发生过程中发挥作用,可能是通过调节其他JAK2突变的影响,如V617F.
- 这些发现扩大了我们对PV中JAK2突变的理解,并表明L604F是疾病发展的潜在因素.
相关概念视频
Cancers Originate from Somatic Mutations in a Single Cell
12.0K
Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...
12.0K
Loss of Tumor Suppressor Gene Functions
4.9K
Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
4.9K
The JAK-STAT Signaling Pathway
9.0K
Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as SH2...
9.0K
Cancer-Critical Genes II: Tumor Suppressor Genes
7.5K
Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
7.5K
PI3K/mTOR/AKT Signaling Pathway
3.6K
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a...
3.6K
Lethal Alleles
15.5K
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...
15.5K


