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Gene & Protein in Disease Comprehensive analysis of ZNF521/Zfp521

produce iNSCs by ectopically expressing the neurogenic modifications (Figure 3). Zfp521 can achieve epigenetic
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factor ZFN521. 16 effects through the overall remodeling of the nucleus.
Zfp521 impairs the development of normal B cells by However, for ZNF521/Zfp521, their N-terminal is
inhibiting its target genes GATA1 and EBF1-mediated regulated by acetylation, 10,13,46 and their N-terminals
differentiation process. 1,22,37,38 Early B cell factor (EBF) is a contain a 12-amino acid sequence called nuclear
transcription factor involved in the transcriptional regulation remodeling and histone deacetylase complex (NuRD),
of various B-cell-specific genes and essential for B lymphocyte which binds to histone deacetylases (HDACs). 6-8,10-13,15,25,37,47
development. 39,40 Zfp521 represses the activity of EBF1 in In general, HDAC deacetylates histones and inhibits gene
vitro, 4,5,13,30 and the deletion of EBF1 leads to increased bone transcription 19,24 (Figure 3).
formation. Overexpression of Zfp521 in vitro antagonizes In addition to NuRD deacetylation-mediated regulation
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cell differentiation and bone nodule formation; on the of Zfp521, Zfp521 is also regulated by SUMOylation
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contrary, knockdown of Zfp521 encourages these processes. (Figure 3). The basic process of modification mainly
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Overexpression of Zfp521 not only significantly reduces involves several steps: Zfp521 can be modified by SUMO1,
CDK1 but also suppresses the expression of PPARγ and with lysine 1146 identified as the main SUMOylation
BMP2 associated with adipogenesis and osteogenesis. 20,42,43 site, serving as a major SUMO1-coupled amino acid
However, in human bone marrow mesenchyme stem cells residue. 29 After SUMOylation, Zfp521 regulates
(bmMSCs), Zfp521 over expression inhibits osteogenic erythrocyte differentiation by directly binding to GATA-
differentiation while boosting adipogenesis, 30,44 and the 1. Furthermore, the deficiency of Zfp521 does not
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reason for this result remains unclear.
significantly affect hematopoietic function under steady-
3. Regulation of ZNF521/Zfp521 state conditions, but it damages the erythroid system
reconstruction under stress conditions, highlighting the
3.1. The regulation of post-translational role of Zfp521 in regulating erythroid differentiation. 29,48
modification of ZNF521/Zfp521 Not only that, SUMOylation deficiency in Zfp521 can

ZNF521/Zfp521 protein expression and enzyme activity induce neuroendocrine changes in recipient mice, which
can be regulated through various post-translational are also crucial for red blood cell differentiation. 48,49

Figure 3. Post-translational modifications of Zfp521. Zfp521 binds to histone deacetylases (HDACs) through a 12-amino acid sequence at its N-terminus.
HDAC deacetylates histones and inhibits gene transcription. Zfp521 is modified by SUMO1, and lysine 1146 is the main SUMOylation site of Zfp521 and
the main amino acid residue of SUMO1 coupling. Zfp521 was modified with lysine residue 1146 by SUMO1, and SUMO coupling was carried out by a
cascade composed of activating enzyme (E1), coupling enzyme (E2), and ligase (E3). The demethylation process is mediated by SENP family members,
including SENP1, 2, 3, 5, 6, and 7. The interaction between Zfp521 and Ebf1 down regulates Zfp521 by increasing SIAH2-mediated ubiquitin-dependent
proteasome degradation of Zfp521.

Volume 3 Issue 3 (2024) 4 doi: 10.36922/gpd.3260