Reorganization of the nuclear architecture in the Drosophila melanogaster Lamin B mutant lacking the CaaX box.

Reorganization of the nuclear architecture in the Drosophila melanogaster Lamin B mutant lacking the CaaX box.
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DOI:
10.1080/19491034.2020.1819704
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发表时间:
2020-12
期刊:
Nucleus (Austin, Tex.)
影响因子:
--
通讯作者:
Sharakhov IV
Sharakhov IV
中科院分区:
其他
文献类型:
--
作者:
Bondarenko SM;Sharakhov IV

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核纤层蛋白与核膜和染色质相互作用,但这些相互作用的确切参与者和机制尚不清楚。在这里,我们测试了是否从核纤层蛋白B去除CaaX基序破坏其附着到核膜,并影响染色质分布。我们使用了缺失CaaX盒的果蝇LamA 25纯合突变体,发现突变体Lamin B不局限于核外围,而是分布在整个核内部,与唾液腺和腺胃中的染色体共定位。核纤层蛋白C、核孔复合体(NPC)、异染色质蛋白1a(HP 1a)、H3 K9 me 2-和H3 K27 me 3-相关染色质的外周位置保持完整。与野生型相比,果蝇腺胃细胞核DAPI染色的周边染色质荧光强度显著降低,中央染色质荧光强度显著增强,但突变对高度多聚化的唾液腺细胞核内染色质的径向分布影响不大。
Lamins interact with the nuclear membrane and chromatin but the precise players and mechanisms of these interactions are unknown. Here, we tested whether the removal of the CaaX motif from Lamin B disrupts its attachment to the nuclear membrane and affects chromatin distribution. We used Drosophila melanogaster LamA25 homozygous mutants that lack the CaaX box. We found that the mutant Lamin B was not confined to the nuclear periphery but was distributed throughout the nuclear interior, colocalizing with chromosomes in salivary gland and proventriculus. The peripheral position of Lamin C, nuclear pore complex (NPC), heterochromatin protein 1a (HP1a), H3K9me2- and H3K27me3-associated chromatin remained intact. The fluorescence intensity of the DAPI-stained peripheral chromatin significantly decreased and that of the central chromatin significantly increased in the proventriculus nuclei of the mutantflies compared to wild-type. However, the mutation had little effect on chromatin radial distribution inside highly polytenized salivary gland nuclei.
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