J Autoimmunity:早期系统性硬化症的基因组不稳定性

2022-08-02 彼岸河边草 MedSci原创

在伴有严重皮肤和/或肺部受累的早期SSc患者的皮肤中存在大量体细胞突变。体细胞突变具有类似时钟的“衰老”特征,并影响许多癌症驱动基因。癌症驱动基因突变可能在 SSc的发病机制中发挥重要作用。

目的:系统性硬化症(SSc)与继发性恶性肿瘤有关。先前的研究表明,突变的癌症蛋白,例如RNA聚合酶 III,是促进SSc炎症反应的自身抗原。然而,以前从未研究过SSc中的非肿瘤组织是否存在可能在SSc发病机制中起作用的突变。

方法8名进行性早期SSc(严重皮肤和/或肺部受累)的连续患者获得皮肤活检。对真皮纤维化区域进行显微解剖,并通过深度全外显子组测序进行分析。将基因突变模式与作为对照的自体颊粘膜细胞进行比较。

结果SSc皮肤活检样本发生超突变,平均每106个碱基对有58个突变。所有样本中的突变模式都表现出类似时钟的特征,这种特征在癌症和衰老细胞中普遍存在。在研究人员鉴定的1997个基因中,至少有两名SSc患者发生了突变,其中39个基因代表了癌症驱动因素(即肿瘤抑制基因或癌基因),这些基因常见于妇科、鳞状细胞和胃肠道癌症特征中。在所有突变中,最常见的突变基因在调节与表观遗传组蛋白修饰、DNA修复和基因组完整性相关的途径中很重要。

结论在伴有严重皮肤和/或肺部受累的早期SSc(病程<3年)患者的皮肤中存在大量体细胞突变。体细胞突变具有类似时钟的“衰老”特征,并影响许多癌症驱动基因。癌症驱动基因突变可能在 SSc的发病机制中发挥重要作用。

出处:Gniadecki R, Iyer A, Hennessey D, Khan L, O'Keefe S, Redmond D, Storek J, Durand C, Cohen-Tervaert JW, Osman M. Genomic instability in early systemic sclerosis. J Autoimmun. 2022 Jul;131:102847. doi: 10.1016/j.jaut.2022.102847. Epub 2022 Jul 6. PMID: 35803104.

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    2022-08-02 新颖

    SSc超突变除了给在肿瘤组织中发挥作用,还会在哪些地方?

    0

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这项研究为肥胖提供新的线索,帮助解释为何有些人的体重更容易增加,喝凉水都会长胖,而另一些人则更容易保持自然的健康。

PNAS:将DNA压缩百万分之一大小的秘密

这项研究开发的技术不仅提供了理解遗传学——所有生物的本质——的关键,而且还揭示了其他材料的3D结构,如病毒,其详细的结构非常重要。

基因组诊断揭示了肺动脉高压的新致病变异

遗传易感性可导致罕见病肺动脉高压 (PAH)。大多数突变已在可遗传的 PAH中的基因BMPR2中发现。在德国最大的 PAH 基因诊断转诊中心在超过 3 年的过程中发现的 PAH 基因的突变分布。

“老烟枪”不患肺癌的原因找到了!你有没有这种“解毒基因”?

吸烟对健康具有负面影响,但抱有侥幸心理,赌自己有“解毒基因”的人不在少数。

ARD: 免疫细胞多组学分析揭示了氧化磷酸化对狼疮 B 细胞功能和器官损伤的作用

研究者确定了一种OXPHOS调节基因PRDX6(过氧化还原蛋白 6)作为 SLE B 细胞的关键驱动因素。