MicroRNA Regulation in B Cell Development

B cell development is a highly ordered process that begins in the bone marrow with commitment of haematopoietic stem cells to the B lineage and proceeds through pro-B, pre-B, immature and mature stages. At each transition, the generation of a functional B cell receptor by V(D)J recombination, elimination of autoreactive clones through central tolerance and subsequent peripheral maturation are tightly controlled. MicroRNAs, small non-coding RNAs of about 22 nucleotides, provide an additional layer of post-transcriptional regulation by binding 3′ untranslated regions of target mRNAs to promote degradation or repress translation. This mechanism modulates key factors involved in cell survival, proliferation, receptor editing and signalling thresholds. Loss of global microRNA processing, for example through deletion of Dicer, arrests development at the pro- to pre-B cell transition. Specific microRNAs or clusters fine-tune networks that govern lineage commitment, checkpoint enforcement and functional competence, with emerging implications for immunodeficiency, autoimmunity and lymphoid malignancies.

Research from Nature Portfolio

Recent studies have elucidated the distinct contributions of individual members of a prominent microRNA cluster to early B cell fate. One cluster member restrains phosphatase and tensin homologue expression to enforce central tolerance, while another influences proliferation and survival pathways to guide progression through the pre-B stage. Loss or overexpression of these microRNAs disrupts receptor editing and checkpoint passage, resulting in altered repertoire diversity. In a complementary line of investigation, another microRNA was shown to regulate peripheral B cell activation within adipose tissue. Ablation of this microRNA in B cells led to heightened antigen presentation and proinflammatory interactions with T cells and macrophages, exacerbating metabolic inflammation and insulin resistance. Restoration of target gene expression reversed these effects, underlining the dual immunological and metabolic roles of microRNA-mediated control in B cell function.

MicroRNA Regulation in B Cell Development publication trend

The graph below shows the total number of articles in microrna regulation in b cell development across all publications each year (not limited to Nature Index journals).

Technical terms

microRNA: A small non-coding RNA molecule that regulates gene expression post-transcriptionally by binding complementary sequences in target mRNAs.

Dicer: An RNase III enzyme that processes precursor microRNAs into mature microRNA duplexes essential for gene silencing.

V(D)J recombination: The somatic rearrangement of variable (V), diversity (D) and joining (J) gene segments to generate diverse antigen-receptor repertoires.

Central tolerance: A checkpoint in primary lymphoid organs that eliminates or edits self-reactive lymphocytes to prevent autoimmunity.

3′ untranslated region (3′UTR): The segment of an mRNA downstream of the coding sequence that often contains regulatory elements targeted by microRNAs.

References

1. Dicer Ablation Affects Antibody Diversity and Cell Survival in the B Lymphocyte Lineage. Cell (2008).
2. Regulation of B-cell development and tolerance by different members of the miR-17∼92 family microRNAs. Nature Communications (2016).
3. miR-150 regulates obesity-associated insulin resistance by controlling B cell functions. Scientific Reports (2016).
4. MicroRNA, miR-501 regulate the V(D)J recombination in B cells. Biochemical Journal (2023).
5. MicroRNA expression profiles identify disease-specific alterations in systemic lupus erythematosus and primary Sjögren's syndrome. PLOS ONE (2017).