Archive 25/5/2

Identification of bacterial species by applying a machine learning method to LPS glycan profiles obtained by using several lectins

A group from Department of Chemistry, Pavillon Alexandre-Vachon, 1045, avenue de la Médecine, Université Laval, Quebec, Canada has reported Lipopolysaccharide (LPS) detection and its bacteria identification with using a panel of several lectins and by applying a machine learning method on it.
https://pmc.ncbi.nlm.nih.gov/articles/PMC12019741/

The sensing and classification of LPS, which are pivotal constituents of Gram-negative bacteria, are fundamentally important in fields such as healthcare, environmental monitoring, and food safety.

This study presents a new approach utilizing a panel of lectins (from 2 to 7 kinds) immobilized on surface plasmon resonance (SPR) sensors. Each glycan binding profile, which is unique to the bacteria, was used to identify the species of bacteria combining with a machine learning method with high accuracy. Used machine learning methods were Random Forest (RF), k-Nearest Neighbors (kNN), and Support Vector Machine (SVM).

It seems that this kind of detection method using multi-probes combined with a machine learning method is a recent trend in sensing applications.

Sialic Acid Acetylation is down-regulated in Ulcerative Colitis

A group from Center for Clinical Mass Spectrometry, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, China etc. has reported about SIAE-Mediated Loss of Sialic Acid Acetylation Contributes to Ulcerative Colitis (UC).
https://pmc.ncbi.nlm.nih.gov/articles/PMC12011031/

In this study, the changes in proteins and glycoproteins in UC compared to healthy controls were analyzed by Mass Spectroscopy.
It was found that sialic acids and their acetylation are reduced in tissues of patients with UC, while sialylation and O-acetylation are more abundant in healthy controls.

Sialic acid, particularly when acetylated, plays a protective role in the colon by preventing inflammation through mechanisms such as modulating immune cell interactions and shielding the intestinal lining from harmful bacteria, acting as a barrier against excessive immune response in the gut.

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