[
Dis Model Mech,
2024]
The 2024 Nobel Prize in Physiology or Medicine has been awarded to Victor Ambros and Gary Ruvkun "for the discovery of microRNA and its role in post-transcriptional gene regulation". The award celebrates the discovery of small regulatory miRNAs and their mRNA targets, published over three decades ago. The groundwork for this discovery was laid during the early 1980s, when Ambros began studying mutations that caused heterochronic defects in the nematode Caenorhabditis elegans - or shifts in the temporal identities of cells. A major impetus to study the heterochronic genes of C. elegans was to gain mechanistic understanding of how developmental stages are specified - a fascinating question in basic and evolutionary biology. Asking fundamental biological questions with no immediate application to human health ultimately led to the discovery of a new type of RNA, which had broad implications for understanding and treating human disease.
[
Trends Parasitol,
2001]
The absence of animal models in which to reproduce successfully the complete life cycle of Onchocerca volvulus has hindered progress towards unravelling the processes involved in the regulation of parasite abundance in the vertebrate host. Mathematical frameworks have been developed to explore the consequences of such processes in determining parasite population dynamics and the effect on these of control interventions. Post-control predictions are strongly influenced by the assumptions concerning the reproductive life span of the adult female worm (the longest-lived parasite stage) and the distribution of its survival times, and this notion is important to all frameworks. Here, we review the development of models concerning onchocerciasis and discuss the various approaches that have been used, presenting a deterministic framework with parameter values estimated from the Mexican onchocerciasis control programme. This model is used to evaluate interventions combining the removal of adult worms (nodulectomy) and the microfilaricidal and possibly sterilizing effect of ivermectin.