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Metabolic Profile of Histomonas meleagridis in Dwyer's Media with and Without Rice Starch

Sawsan Ammar1,2, Courtney J Christopher3, Nicole Szafranski1

  • 1Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, 2407 River Drive, Knoxville, TN 37996, USA.

Metabolites
|December 27, 2024
PubMed
Abstract

Insights

Rice starch significantly enhances Histomonas meleagridis growth by influencing riboflavin biosynthesis. This finding is crucial for understanding and improving in vitro culture of this poultry pathogen.

Area of Science:

  • Parasitology
  • Microbiology
  • Metabolomics

Background:

  • Histomonas meleagridis causes economically significant histomonosis (blackhead disease) in poultry.
  • Current in vitro culture methods for H. meleagridis are complicated by the need for undefined media components like starch.
  • The precise role of starch in H. meleagridis media remains poorly understood, hindering commercialization.

Purpose of the Study:

  • To investigate intracellular metabolomic differences in H. meleagridis and associated bacteria grown with and without rice starch.
  • To elucidate the impact of rice starch on H. meleagridis growth and metabolism.

Main Methods:

  • Global metabolomics analysis using ultra-high-performance liquid chromatography-high-resolution mass spectrometry.
  • Comparison of H. meleagridis and bacterial growth in Dwyer's media with (SD) and without (NR) rice starch.

Main Results:

  • Rice starch (SD) significantly supported H. meleagridis growth compared to media without starch (NR).
  • Bacterial growth showed no significant difference between SD and NR media.
  • 170 known intracellular metabolites were identified, with H. meleagridis being the primary contributor to metabolic variations.

Conclusions:

  • Riboflavin and its biosynthesis pathway metabolites significantly contributed to the observed metabolic differences.
  • Riboflavin biosynthesis is a key factor influenced by rice starch in H. meleagridis culture.
  • Further research into riboflavin's role is warranted for optimizing H. meleagridis cultivation.
Keywords:
Histomonas meleagridismass spectrometrymetabolomicsprotozoa propagationriboflavin

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