American Society of Microbiology ABMM ABMM Question # 88 Topic 4 Discussion

American Society of Microbiology ABMM ABMM Question # 88 Topic 4 Discussion

ABMM Exam Topic 4 Question 88 Discussion:
Question #: 88
Topic #: 4

A research laboratory is investigating the mechanisms of antigenic variation in Trypanosoma brucei, the causative agent of African trypanosomiasis. The parasite evades the host immune response by periodically changing its surface coat protein. This process primarily involves:


A.

High-frequency point mutations in the gene encoding the variant surface glycoprotein (VSG).


B.

Segmental gene conversion events involving a large repertoire of silent VSG genes.


C.

RNA interference-mediated silencing of expressed VSG genes followed by activation of a new VSG gene.


D.

Recombination between different VSG gene loci on minichromosomes.


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