Active Infection & Immunity Lungs & Breathing

Elucidating novel immune evasion strategies of Candida albicans

In plain English

AI plain-English summary

The fungus *Candida albicans* rewrites its outer surface to hide from the immune system, and researchers have now found it uses at least one more trick beyond the two already known. This matters because *Candida* is a common, normally harmless resident of the human body that can turn deadly in people with weakened immunity—causing bloodstream infections that kill roughly half of those affected. The immune system’s first line of defence, innate immunity, constantly pressures the fungus to evolve new ways to evade detection. The team has discovered that certain conditions inside the host trigger immune evasion that does not rely on the two known mechanisms (cell-wall glucan masking and Factor H complement inactivation), meaning the fungus has additional, unidentified strategies. If this research succeeds, it will map those hidden evasion tactics and reveal the host niches where they operate. By engineering fungal mutants with enhanced or reduced evasion, the team can test how these strategies shape the microbiome and drive infection in realistic clinical scenarios. The work is fundamental science—understanding how a pathogen outruns immunity—but it directly points to new therapeutic targets. Restoring immune recognition could prevent infections without relying on antifungals, offering a way to disarm the fungus rather than kill it.

View original technical description
Innate immunity is key for protection against fungal pathogens, providing selective pressure on fungi to evolve immune evasion strategies. Candida albicans is a commensal and opportunistic fungal pathogen, that can evade the immune system by remodelling its cell wall to prevent recognition of glucan, or through Factor H dependent inactivation of the alternative complement system. We have identified that other environmental conditions encountered in the host promote immune evasion of C. albicans independently of glucan remodelling and Factor H binding, suggesting that C. albicans has evolved other immune evasion strategies to aid its survival in the host. Using in vitro screens and fungal molecular biology, in combination with unbiased in vivo approaches, we will determine which host niches promote immune evasion and underpin their molecular mechanisms. Once mapped, we will manipulate fungal immune evasion using mutants with reduced or enhanced evasion capacity to understand their impact on the composition of the microbiome, and the role of these strategies in clinically relevant scenarios. This all-encompassing project will provide a step-change in our understanding of fungal pathogenicity and will lead to the identification of new therapeutic targets which can be exploited to restore immune recognition and prevent infection.

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Researchers

Rebecca Drummond (EPMC Awardee)Rebecca Hall (EPMC Awardee)

Related Research

Grants with similar aims, by meaning.

Avoiding the immune system: Using Candida albicans as a tool to understand microbial innate immune evasion strategies
The unexpected consequences of antifungals on innate immune interactions
Impact of fungal adaptation upon host recognition and pathogenesis
Fungal neighbourhood watch: Understanding how combinatorial signals from the host niche drive pathogenesis in candida albicans
MRes in Medical Mycology and Fungal Immunology

Original classification

Discovery Award

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