The resilient bacteria in your gut may hold the key to metabolic health
In short: Bacillota, formerly known as Firmicutes, are a diverse phylum of bacteria found everywhere from your gut to fermented beverages. While some species are notorious pathogens, others are essential to human health. Recent research suggests these microbes influence everything from energy absorption to body weight and systemic inflammation.
The Bacillota phylum, traditionally called Firmicutes, is defined by a thick, tough cell wall. While most members are Gram-positive, a few classes, such as Negativicutes, possess a porous pseudo-outer membrane that leads to a Gram-negative staining result. These bacteria are typically categorized into two main groups: the anaerobic Clostridia and the Bacilli, which can be obligate or optional aerobes. Their evolutionary history is complex; while the phylum is generally considered monophyletic, some researchers propose that archaea may have branched from within this bacterial lineage rather than evolving as a separate domain from the last universal common ancestor.
In the human gut, Bacillota are remarkably abundant, comprising between 11% and 95% of the microbiome. Their influence on metabolism is significant. Studies have consistently observed a higher relative abundance of these bacteria in obese individuals compared to lean controls. In experiments with mice, those fed a high-fat, high-sugar western diet showed increased levels of Bacillota, which correlated with higher body weight and adiposity. Crucially, transplanting microbiota from obese mice into germ-free subjects resulted in increased fat gain, suggesting a direct link between these microbial communities and energy resorption.
The phylum is not uniformly associated with poor health outcomes. Certain species, such as Christensenella, are correlated with a lower body mass index, while Faecalibacterium prausnitzii is linked to anti-inflammatory effects and is often found at lower levels in patients with inflammatory bowel disease. However, the phylum also contains dangerous pathogens like Bacillus anthracis and Clostridioides difficile. Furthermore, opportunistic species like Staphylococcus aureus present a major public health challenge due to rising antibiotic resistance, with MRSA strains estimated to cause 100,000 deaths annually. Understanding the balance of these microbes is a rapidly evolving frontier in medicine.
The taxonomy of these organisms remains a subject of debate. In 2021, the formal renaming of the phylum sparked controversy among microbiologists, many of whom prefer the long-standing name Firmicutes. Current classification relies on databases like the List of Prokaryotic names with Standing in Nomenclature, which tracks the over 274 genera identified within the phylum as of 2016.
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- Summary by Intellect · source: Bacillota
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