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PDP1
pyruvate dehydrogenase phosphatase catalytic subunit 1
The PDP1 gene provides instructions for producing pyruvate dehydrogenase phosphatase 1, a protein crucial for regulating the pyruvate dehydrogenase complex and cellular energy production. PDP1 encodes a key enzyme, pyruvate dehydrogenase phosphatase 1, which helps regulate the pyruvate dehydrogenase complex.
PDP1 is located on the long (q) arm of chromosome 8, at band 8q22.1. Arm ratio per GRCh38 - banding schematic.
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Overview
The PDP1 gene directs the synthesis of pyruvate dehydrogenase phosphatase 1, an enzyme that plays a critical role in cellular energy metabolism. This protein forms part of the larger pyruvate dehydrogenase complex, which is essential for converting carbohydrates into a form cells can utilise for energy.
Dysregulation of PDP1's function can impact the efficiency of energy conversion, potentially leading to specific metabolic conditions. Understanding PDP1 is therefore important for comprehending certain inherited metabolic disorders.
What the gene does
The protein encoded by the PDP1 gene, pyruvate dehydrogenase phosphatase 1, is a component of the pyruvate dehydrogenase complex. Its primary function involves activating this complex by removing a phosphate group from it. This activation step is crucial because the pyruvate dehydrogenase complex is responsible for converting pyruvate - a molecule derived from carbohydrate breakdown - into acetyl-CoA.
Acetyl-CoA then enters the series of chemical reactions that generate adenosine triphosphate (ATP), the main energy currency of the cell. Therefore, PDP1's activity directly influences the initiation of ATP production from carbohydrates, making it fundamental to the body's energy supply.
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Chromosome location
The PDP1 gene is situated on chromosome 8, specifically at position 8q22.1. This genomic location refers to the long (q) arm of chromosome 8, within band 22.1. The precise placement on the chromosome helps in mapping and understanding genetic variations.
Protein structure
The PDP1 protein is composed of 537 amino acids. It features a key functional region known as the PPM-type phosphatase domain, located between amino acid positions 109 and 525. This domain is responsible for the protein's catalytic activity in removing phosphate groups.
Key variants
Variations within the PDP1 gene can affect the structure and function of the pyruvate dehydrogenase phosphatase 1 protein. These genetic changes can range from single nucleotide alterations to larger deletions or insertions, and their impact depends on how they alter the protein's ability to regulate the pyruvate dehydrogenase complex. While some variants may be benign, others can be pathogenic, leading to clinical consequences.
Sample of pathogenic variants
2 pathogenic / likely-pathogenic variants from ClinVar, ranked by review status (expert-panel-reviewed first). This is a sample; recurrent founder variants in a specific population may not appear here - see the full ClinVar listing via the link above.
| Variant (HGVS) | Protein change | Classification | Evidence | Associated condition |
|---|---|---|---|---|
c.277G>T | p.Glu93Ter | Pathogenic | - | Pyruvate dehydrogenase phosphatase deficiency |
c.851_853del | p.Leu284del | Pathogenic | - | Pyruvate dehydrogenase phosphatase deficiency |
Evidence stars indicate ClinVar review status. Individual variant interpretation should always be performed by a qualified clinical laboratory - many variants remain classified as Variants of Uncertain Significance (VUS) pending more research.
Associated conditions
Pathogenic variants in the PDP1 gene are a rare cause of pyruvate dehydrogenase deficiency. This condition is characterised by a potentially life-threatening build-up of lactic acid in the body, known as lactic acidosis, alongside delayed development and various neurological problems. The deficiency arises from the impaired ability of the pyruvate dehydrogenase complex to function correctly, disrupting cellular energy production.
No disease links recorded for this gene in our reference set.
UK clinical status
The PDP1 gene is recognised within several NHS Genomic Medicine Service national test directories, indicating its clinical relevance in the UK. It is included in panels for "Likely inborn error of metabolism" (R98), "Mitochondrial disorders", "Possible mitochondrial disorder, nuclear genes" (R63), "Pyruvate dehydrogenase (PDH) deficiency" (R316), and "Structural basal ganglia disorders". It is also part of panels for "Undiagnosed metabolic disorders".
Sources: NHS GMS PanelApp · Genomics England PanelApp · NHS National Genomic Test Directory
Frequently asked questions
What is the primary role of the PDP1 gene?
The PDP1 gene provides instructions for making pyruvate dehydrogenase phosphatase 1, a protein that activates the pyruvate dehydrogenase complex. This complex is crucial for converting carbohydrates into a usable form of energy for cells.
What condition is associated with PDP1 gene variations?
Variations in the PDP1 gene are a rare cause of pyruvate dehydrogenase deficiency. This condition can lead to lactic acidosis, developmental delay, and neurological issues due to impaired energy metabolism.
Where is the PDP1 gene located?
The PDP1 gene is located on chromosome 8, specifically at position 8q22.1. This address helps geneticists identify and study the gene within the human genome.
References
- Cameron JM, Maj M, Levandovskiy V. Pyruvate dehydrogenase phosphatase 1 (PDP1) null mutation produces a lethal infantile phenotype. Human genetics. 2009. PMID: 19184109
- Maj MC, MacKay N, Levandovskiy V. Pyruvate dehydrogenase phosphatase deficiency: identification of the first mutation in two brothers and restoration of activity by protein complementation. The Journal of clinical endocrinology and metabolism. 2005. PMID: 15855260
- Roche TE, Hiromasa Y, Turkan A. Essential roles of lipoyl domains in the activated function and control of pyruvate dehydrogenase kinases and phosphatase isoform 1. European journal of biochemistry. 2003. PMID: 12631265
- Adam MP, Bick S, Mirzaa GM. Primary Pyruvate Dehydrogenase Complex Deficiency Overview. 1993. PMID: 34138529