The Myc-Associated Zinc Finger Protein (MAZ) Works Both Independently and Together with CTCF to Control Cohesin Positioning and Genome Organization

2020 ◽  
Author(s):  
Tiaojiang Xiao ◽  
Xin Li ◽  
Gary Felsenfeld
Keyword(s):  
Zinc Finger ◽  
Genome Organization ◽  
Zinc Finger Protein ◽  
Finger Protein

scholarly journals The Myc-associated zinc finger protein (MAZ) works together with CTCF to control cohesin positioning and genome organization

2021 ◽  
Vol 118 (7) ◽  
pp. e2023127118
Author(s):  
Tiaojiang Xiao ◽  
Xin Li ◽  
Gary Felsenfeld
Keyword(s):  
Rna Polymerase Ii ◽  
Zinc Finger ◽  
Binding Sites ◽  
Genome Organization ◽  
Large Scale ◽  
Zinc Finger Protein ◽  
Ctcf Binding ◽  
Finger Protein ◽  
Topologically Associated Domains ◽  
Cohesin Subunit

The Myc-associated zinc finger protein (MAZ) is often found at genomic binding sites adjacent to CTCF, a protein which affects large-scale genome organization through its interaction with cohesin. We show here that, like CTCF, MAZ physically interacts with a cohesin subunit and can arrest cohesin sliding independently of CTCF. It also shares with CTCF the ability to independently pause the elongating form of RNA polymerase II, and consequently affects RNA alternative splicing. CTCF/MAZ double sites are more effective at sequestering cohesin than sites occupied only by CTCF. Furthermore, depletion of CTCF results in preferential loss of CTCF from sites not occupied by MAZ. In an assay for insulation activity like that used for CTCF, binding of MAZ to sites between an enhancer and promoter results in down-regulation of reporter gene expression, supporting a role for MAZ as an insulator protein. Hi-C analysis of the effect of MAZ depletion on genome organization shows that local interactions within topologically associated domains (TADs) are disrupted, as well as contacts that establish the boundaries of individual TADs. We conclude that MAZ augments the action of CTCF in organizing the genome, but also shares properties with CTCF that allow it to act independently.

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