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Pyruvate dehydrogenase phosphatase deficiency is a very rare subtype of pyruvate dehydrogenase deficiency (PDHD) characterized by lactic acidemia in the neonatal period.
Features include always present findings: Feeding difficulties, Low muscle tone (hypotonia), Global developmental delay, and Decreased activity of the pyruvate dehydrogenase complex and others. 11 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 5 | Difficulty swallowing (dysphagia), Seizure, Gait ataxia |
PDP1 function has not been fully characterized.
Pyruvate dehydrogenase phosphatase deficiency is associated with mutations in the PDP1 gene on chromosome 8.
Genetic testing for PDP1 is available. Testing is considered confirmatory for diagnosis.
Phenotype severity distribution: 5 always present features.
Estimated prevalence: Unknown (Unknown prevalence).
No clinical trials have been registered for pyruvate dehydrogenase phosphatase deficiency.
3 publications have been identified in PubMed for pyruvate dehydrogenase phosphatase deficiency. Research spans Review / Meta-Analysis (67%) and Basic Science / Preclinical (33%).
Patel MS (2026). [PMID: 41045434](https://pubmed.ncbi.nlm.nih.gov/41045434/). *Int J Cancer*. [Review / Meta-Analysis]
Kumar V (2025). [PMID: 40491447](https://pubmed.ncbi.nlm.nih.gov/40491447/). *Front Physiol*. [Review / Meta-Analysis]
Kang T (2025). [PMID: 40857407](https://pubmed.ncbi.nlm.nih.gov/40857407/). *JCI Insight*. [Basic Science / Preclinical]
Data assembled from 6 of 12 sources · Last updated Sep 18, 2026, 4:12 AM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Digestive system
2 |
Difficulty swallowing (dysphagia), Feeding difficulties |
Muscles | 2 | Low muscle tone (hypotonia), Generalized hypotonia |
Eyes | 1 | Nystagmus |
Lab test results | 1 | Decreased activity of the pyruvate dehydrogenase complex |
Age of onset: newborn period.