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BMS3031 - Molecular mechanisms of disease - S1 2026
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Genome-wide association studies in patients with systemic lupus erythematosus identify risk variants in genes involved in interferon signalling, antigen presentation, and regulation of lymphocyte activation. Many of these variants alter immune signalling thresholds rather than directly causing tissue damage.
Which interpretation BEST explains how these findings contribute to understanding the pathogenesis of systemic lupus erythematosus?
A disease process is characterised by immune-mediated injury arising from loss of tolerance to self-antigens. The resulting pathology manifests concurrently in multiple anatomically and functionally distinct tissues, including connective tissue, vascular structures, and internal organs.
Which classification MOST accurately captures
the underlying nature of this disease process?
A patient demonstrates chronic inflammation in diverse organ systems. Immunological investigation shows circulating autoantibodies and widespread immune complex deposition, indicating that pathogenic immune mechanisms are not confined to a single anatomical site.
From an immunopathological perspective, which classification BEST explains both the distribution of tissue injury and the mechanism driving disease?
Before encountering antigen, the immune system already contains B cells capable of recognising a vast range of potential pathogens.
Which process BEST explains how this diversity is generated during B cell development?
During early B cell development, gene segments encoding antibody variable regions undergo rearrangement to generate diverse antigen receptors.
Which mechanism contributes most directly to the
enormous number of potential antigen specificities generated before antigen
exposure?
A drug that inhibits BTK is effective in treating certain B cell malignancies by blocking signalling pathways that promote tumour cell growth.
Which physiological role for BTK best explains
why inhibiting this pathway affects B cell cancers?
Bruton’s tyrosine kinase (BTK) is a cytoplasmic signalling molecule downstream of the B cell receptor. Inhibitors of BTK are clinically effective in treating certain B cell malignancies by interfering with survival and growth pathways.
Which physiological function for BTK best
explains why inhibition of this kinase is effective against B cell cancers?
Analysis of immunoglobulin genes from germinal centre B cells after repeated antigen exposure shows extensive mutation within the variable region. While many mutations are silent, amino acid–altering changes are disproportionately found in regions that directly contact antigen.
Which explanation best accounts for this
non-random distribution of mutations within antibody genes?
Early in an immune response, antibodies with relatively low affinity for antigen can still bind pathogens effectively when produced as IgM.
Which explanation BEST accounts for this
observation?
Analysis of antibody genes from B cells after repeated antigen exposure reveals many silent mutations throughout the variable region, but amino acid–altering mutations are concentrated in specific antigen-contact regions. Which of the following provides the best explanation for the distribution of mutations within the antibody?