Application of IgA-Seq in schizophrenia to identify key gut bacteria that promote abnormal behavior in mice.

IgA-coated gut bacteria from schizophrenia patients induce distinct behavioral and tissue responses in mice, highlighting immune-targeted taxa's role in disease-related alterations.

• Why it matters: Understanding which gut bacteria are closely engaged by mucosal immunity is crucial for elucidating microbiota's contribution to schizophrenia, beyond mere abundance profiling, to identify potential therapeutic targets.
• What they did: Researchers used IgA-based bacterial sorting from fecal samples of humans with schizophrenia and controls, cultured prioritized taxa into consortia, and administered them to various mouse models, assessing behavioral and biological outcomes.
• The result: The study found that IgA+ bacterial consortia elicited specific behavioral changes and tissue effects, such as altered open-field behavior and colon length, suggesting immune-targeted bacteria influence schizophrenia-related phenotypes, though causality remains to be confirmed.