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Related Experiment Videos

Cardiopulmonary phenotype associated with human PHD2 mutation.

Nick P Talbot1, Thomas G Smith1, George M Balanos2

  • 1Department of Physiology, Anatomy & Genetics, University of Oxford, Oxford, United Kingdom.

Physiological Reports
|April 13, 2017
PubMed
Summary

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A mutation in PHD2, a key protein in oxygen sensing, caused exaggerated responses to low oxygen in a patient with erythrocytosis. This highlights potential cardiopulmonary risks associated with PHD2 mutations and related therapies.

Area of Science:

  • Molecular Biology
  • Physiology

Background:

  • Oxygen homeostasis is regulated by the hypoxia-inducible factor (HIF) pathway, involving prolyl hydroxylase domain (PHD) proteins and the von Hippel-Lindau (VHL) tumor suppressor.
  • PHD enzymes hydroxylate HIF, targeting it for degradation under normoxia; under hypoxia, PHD inactivation stabilizes HIF, upregulating erythropoietin and other genes.
  • Mutations in the PHD-HIF-VHL pathway are linked to congenital erythrocytosis, but associated cardiopulmonary issues are rarely reported.

Observation:

  • A 35-year-old male presented with erythrocytosis due to a heterozygous mutation in PHD2, a primary PHD isoform.
  • This patient exhibited unusually severe pulmonary vascular and ventilatory responses to acute hypoxia.

Findings:

  • The patient's phenotype, characterized by exaggerated hypoxic responses, was compared to Chuvash polycythemia, a disorder of cellular oxygen sensing.
Keywords:
Hypoxiahypoxia‐inducible factorprolyl hydroxylase domain proteinpulmonary circulationventilation

Related Experiment Videos

  • This case suggests that PHD2 mutations can lead to significant cardiopulmonary adaptations to hypoxia.

    • Implications:

    • Understanding the clinical spectrum of PHD2 mutations is crucial, especially given the development of PHD inhibitors for therapeutic use.
    • These findings underscore the importance of assessing cardiopulmonary function in individuals with erythrocytosis and PHD pathway mutations.
    • The study provides insights into the role of PHD2 in cardiovascular and ventilatory regulation during hypoxia.