Acta Neuropathologica: 透明细胞脑膜瘤的定义是高度不同的DNA甲基化谱和SMARCE1突变

2021-01-03 MedSci原创 MedSci原创

脑膜瘤是最常见的原发性中枢神经系统肿瘤,约占所有脑肿瘤的三分之一。透明细胞脑膜瘤是一种罕见的脑膜瘤,通常影响儿童和年轻人。在组织学上,其以圆形或多边形透明细胞片和血管周围及间质胶原为特征。

脑膜瘤是最常见的原发性中枢神经系统肿瘤,约占所有脑肿瘤的三分之一。透明细胞脑膜瘤是一种罕见的脑膜瘤,通常影响儿童和年轻人。在组织学上,其以圆形或多边形透明细胞片和血管周围及间质胶原为特征。透明细胞脑膜瘤与更具侵袭性的行为有关,因此被列为世界卫生组织(WHO)2级肿瘤。

从遗传学角度来说,已有报道称,这种脑膜瘤亚型的SMARCE1基因编码SWI/SNF染色质重塑复合体的一个亚单位的功能缺失突变的富集。NF2突变常见于其他脑膜瘤,但在这种亚型中很少见。然而,尚不清楚透明细胞脑膜瘤是否仅仅是一种形态学变异(尽管有预后意义),原则上可以与各种驱动改变有关,还是SMARCE1改变的优势是否指向这些特征独特的一组确定的分子基础仍未知。

在这项研究中,作者团队描述了一个分子上不同的肿瘤亚群(n=31),这最初是通过全基因组DNA甲基化筛查在3093个脑膜瘤队列中发现的,其中大多数在组织学上被诊断为透明细胞脑膜瘤。该队列还进一步对另外11例组织学诊断的透明细胞脑膜瘤进行分析(n = 42)。

靶向DNA测序显示33/34分析样本中有SMARCE1突变,同时伴随着通过免疫组织化学确定的核表达缺失和肿瘤细胞中SMARCE1转录物表达降低。透明细胞脑膜瘤组(n=14)与WHO 2级脑膜瘤组(n=220)患者的进展或复发时间进行分析,两者结果相似,这支持WHO将这些脑膜瘤分为2级。

综上所述,研究结果表明,透明细胞脑膜瘤存在一种高度独特的表观遗传学特征,与脑膜瘤的所有其他变体不同,SMARCE1基因存在反复突变。而这预示着这些肿瘤可能来自不同于其他脑膜瘤亚型的前体细胞群。

Sievers, P., Sill, M., Blume, C. et al. Clear cell meningiomas are defined by a highly distinct DNA methylation profile and mutations in SMARCE1Acta Neuropathol (2020). https://doi.org/10.1007/s00401-020-02247-2

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    2021-09-02 windight
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    2021-01-12 yb6560
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    2021-01-05 江川靖瑶
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    2021-01-04 慎独

    脑膜瘤还是比较常见的

    0

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