The RAG1 N-terminal region regulates the efficiency and pathways of synapsis for V(D)J recombination.
J Exp Med
; 218(10)2021 10 04.
Article
em En
| MEDLINE
| ID: mdl-34402853
ABSTRACT
Immunoglobulin and T cell receptor gene assembly depends on V(D)J recombination initiated by the RAG1-RAG2 recombinase. The RAG1 N-terminal region (NTR; aa 1-383) has been implicated in regulatory functions whose influence on V(D)J recombination and lymphocyte development in vivo is poorly understood. We generated mice in which RAG1 lacks ubiquitin ligase activity (P326G), the major site of autoubiquitination (K233R), or its first 215 residues (Δ215). While few abnormalities were detected in R1.K233R mice, R1.P326G mice exhibit multiple features indicative of reduced recombination efficiency, including an increased Igκ+Igλ+ B cell ratio and decreased recombination of Igh, Igκ, Igλ, and Tcrb loci. Previous studies indicate that synapsis of recombining partners during Igh recombination occurs through two pathways long-range scanning and short-range collision. We find that R1Δ215 mice exhibit reduced short-range Igh and Tcrb D-to-J recombination. Our findings indicate that the RAG1 NTR regulates V(D)J recombination and lymphocyte development by multiple pathways, including control of the balance between short- and long-range recombination.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Proteínas de Homeodomínio
/
Recombinação V(D)J
Limite:
Animals
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article