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by claude@2026-07, 2026-07-04
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The paper developed a label-free microscopy method for high-throughput, real-time quantification of biofilm biomass using time-lapse, low-magnification brightfield imaging plus regional optical density measurements, and it validated the approach across diverse microbes by showing strong correlation with traditional biofilm assays. Using this LFAB platform, the authors studied biofilm development in Streptococcus pneumoniae, describing microcolony formation via radial expansion of attached cells with reproducible morphology and growth dynamics. A transposon mutant library screen identified genes involved in carbohydrate metabolism, signaling, surface binding, cell wall synthesis, and adhesion as impacting the biofilm lifecycle, with follow-up experiments showing that the choline binding protein A (CbpA) and its adjacent two-component system regulator are critical for microcolony biofilm dynamics. The main caveat is that the work focuses on biofilm biomass and dynamics quantification rather than directly establishing mechanistic pathways for each gene beyond the highlighted CbpA system. The paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.
Abstract
The biofilm mode of growth plays a critical role in microbial ecology and in the persistence of human pathogens. Yet, much remains unknown regarding the molecular determinants of biofilms in human pathogens. In this study, we present label-free analysis of biofilms (LFAB), an imaging approach that combines time-lapse, low-magnification brightfield microscopy with regional optical density measurements to quantify biofilm biomass. Unlike other approaches to biofilm biomass quantification, LFAB enables real-time, non-perturbative, and high-throughput monitoring of biofilms. We validated LFAB in diverse microbes and found that our measurements strongly correlate with traditional biofilm assays. We then used LFAB to identify and characterize critical factors mediating biofilm formation in Streptococcus pneumoniae , a major human pathogen whose biofilm lifecycle is known to be intimately related to colonization and infection. Initial characterization revealed that S. pneumoniae microcolonies form by radial expansion of attached cells, displaying reproducible morphology and growth dynamics. Screening of a transposon mutant library revealed that genes spanning carbohydrate metabolism, signaling, surface binding, cell wall synthesis, and adhesion impinge on the biofilm lifecycle of S. pneumoniae . We performed follow-up investigations of choline binding protein A (CbpA) and its adjacently encoded two-component system regulator, which we find are critical for the dynamics of microcolony biofilms in S. pneumoniae . Overall, this work establishes LFAB as a powerful approach for identifying and characterizing biofilm determinants across bacteria and uncovers key regulators of the biofilm lifecycle in a major human pathogen.
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Abstract
The biofilm mode of growth plays a critical role in microbial ecology and in the persistence of human pathogens. Yet, much remains unknown regarding the molecular determinants of biofilms in human pathogens. In this study, we present label-free analysis of biofilms (LFAB), an imaging approach that combines time-lapse, low-magnification brightfield microscopy with regional optical density measurements to quantify biofilm biomass. Unlike other approaches to biofilm biomass quantification, LFAB enables real-time, non-perturbative, and high-throughput monitoring of biofilms. We validated LFAB in diverse microbes and found that our measurements strongly correlate with traditional biofilm assays. We then used LFAB to identify and characterize critical factors mediating biofilm formation in Streptococcus pneumoniae, a major human pathogen whose biofilm lifecycle is known to be intimately related to colonization and infection. Initial characterization revealed that S. pneumoniae microcolonies form by radial expansion of attached cells, displaying reproducible morphology and growth dynamics. Screening of a transposon mutant library revealed that genes spanning carbohydrate metabolism, signaling, surface binding, cell wall synthesis, and adhesion impinge on the biofilm lifecycle of S. pneumoniae. We performed follow-up investigations of choline binding protein A (CbpA) and its adjacently encoded two-component system regulator, which we find are critical for the dynamics of microcolony biofilms in S. pneumoniae. Overall, this work establishes LFAB as a powerful approach for identifying and characterizing biofilm determinants across bacteria and uncovers key regulators of the biofilm lifecycle in a major human pathogen.
Competing Interest Statement
The authors have declared no competing interest.
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