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Area of Science:

  • Metabolic disorders
  • Microbiome research
  • Nutritional science

Background:

  • Phenylketonuria (PKU) is a genetic metabolic disorder causing high phenylalanine (Phe) levels.
  • Dietary management, including a Phe-restricted diet, is crucial for preventing neurological damage in PKU.
  • The gut microbiota is influenced by diet and may play a role in metabolic health.

Purpose of the Study:

  • To investigate differences in gut microbiota composition between PKU patients on dietary treatment and healthy controls.
  • To explore potential links between gut microbiome alterations and Phe levels or dietary interventions in PKU.

Main Methods:

  • 16S rRNA sequencing on the Ion Torrent™ platform was used to characterize gut microbiota.
  • Comparison of microbial taxonomic profiles between 8 PKU patients and 10 healthy individuals.
  • Bioinformatic analysis for microbial function prediction, focusing on metabolic pathways.

Main Results:

  • Dominant bacterial phyla in both groups were Bacteroidetes and Firmicutes.
  • PKU patients exhibited reduced abundance of specific bacterial families (e.g., Clostridiaceae) and genera (e.g., Coprococcus).
  • PKU patients showed enrichment in Prevotella and Akkermansia, with predicted differences in starch/glucose and amino acid metabolism.

Conclusions:

  • Gut microbiome composition differs significantly between PKU patients on dietary treatment and healthy individuals.
  • Observed microbial changes may be associated with plasma Phe concentration or the Phe-restricted diet.
  • Further research is needed to determine if these microbiome alterations are a cause or consequence of PKU and its management.