Chromatin associated α-satellite RNA maintains chromosome stability by re-establishing SAF-A in the mitotic cell cycle [ChIRP-seq]

ABSTRACT: RNA components seem to be required for the localization of SAF-A on chromatin. A SAF-A/RNA mesh model has been proposed and supported by super-resolved images, in which SAF-A forms a homogeneous mesh together with nuclear scaffolding RNA species to regulate chromatin structure. As an evolutionarily conserved RNA-binding protein, SAF-A has been reported to interact with a wide variety of RNAs in different cell types. Particularly, a recent study points out that repetitive non-coding sequences of pre-mRNAs and lncRNAs can serve as scaffold RNAs to counter chromatin compaction and maintain chromosome territory architecture together with SAF-A. At this moment, most studies have demonstrated the role of SAF-A/RNA in regulating interphase chromatin structure, and very few works have covered the role of SAF-A/RNA in mitosis. A recent study showed that SAF-A, together with most of its interacting RNAs, needs to be evicted from the condensing chromosomes during mitosis. This brings out an open question of how the SAF-A/RNA scaffold is disassembled and rebuilt when the cell enters and exits mitosis. Here, we showed that α-satellite RNA is dynamically expressed and stays associated with the centromeric chromatin throughout the mitotic cell cycle. Specific interactions between α-satellite RNA and SAF-A were observed both in vitro and in vivo. Depletion of either α-satellite RNA or SAF-A would lead to chromosome missegregation phenotypes during mitosis. More importantly, interfering with α-satellite RNA showed an evident effect on the chromatin relocalization of SAF-A, and further LAP2 upon mitosis exit. Therefore, we proposed that α-satellite RNA may act as a foundation stone for recruiting SAF-A scaffold upon mitosis exit.

ORGANISM(S): Homo sapiens

PROVIDER: GSE270307 | GEO | 2025/03/25

REPOSITORIES: GEO