USP7 promotes IgA class switching through stabilizing RUNX3 for germline transcription activation.
Cell Rep
; 43(5): 114194, 2024 May 28.
Article
de En
| MEDLINE
| ID: mdl-38735043
ABSTRACT
Class switch recombination (CSR) diversifies the effector functions of antibodies and involves complex regulation of transcription and DNA damage repair. Here, we show that the deubiquitinase USP7 promotes CSR to immunoglobulin A (IgA) and suppresses unscheduled IgG switching in mature B cells independent of its role in DNA damage repair, but through modulating switch region germline transcription. USP7 depletion impairs Sα transcription, leading to abnormal activation of Sγ germline transcription and increased interaction with the CSR center via loop extrusion for unscheduled IgG switching. Rescue of Sα transcription by transforming growth factor ß (TGF-ß) in USP7-deleted cells suppresses Sγ germline transcription and prevents loop extrusion toward IgG CSR. Mechanistically, USP7 protects transcription factor RUNX3 from ubiquitination-mediated degradation to promote Sα germline transcription. Our study provides evidence for active transcription serving as an anchor to impede loop extrusion and reveals a functional interplay between USP7 and TGF-ß signaling in promoting RUNX3 expression for efficient IgA CSR.
Mots clés
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Immunoglobuline A
/
Activation de la transcription
/
Commutation de classe des immunoglobulines
/
Sous-unité alpha 3 du facteur CBF
/
Ubiquitin-specific peptidase 7
Limites:
Animals
/
Humans
Langue:
En
Journal:
Cell Rep
/
Cell reports
Année:
2024
Type de document:
Article
Pays de publication:
États-Unis d'Amérique