Pyridoxine-dependent seizures: molecular mechanisms & dependencies

How nutrients influence it

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What it does

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Recorded relationships

Where it participates (unsigned role)

Children with pyridoxine-dependent seizures have mutations in the ALDH7A1 gene which encodes antiquitin, these mutations abolish the activity of antiquitin as a delta-1-piperideine-6-carboxylate to alpha-aminoadipic semialdehyde dehydrogenase, the accumulating delta-1-piperideine-6-carboxylate inactivates pyridoxal 5-phosphate by forming a Knoevenagel condensation product, and measurement of urinary alpha-aminoadipic semialdehyde provides a simple way of confirming the diagnosis.
Delta-1-piperideine-6-carboxylate → PLP source_derived_draftungraded
Experimental context and source evidence
availability_state
machinery_impairment Imported condition classification; unverified.
evidence_span
{"source_cache": "artifacts/gaba-research/16491085.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "da61b07cc71e16803fe09321738c7a6c8d2cbac0dff2b189b9f2586ce5950bfa", "start_char": 0, "end_char": 550, "text_sha256": "da61b07cc71e16803fe09321738c7a6c8d2cbac0dff2b189b9f2586ce5950bfa"}
experimental_model
Gene analysis and metabolite measurement in children with pyridoxine-dependent seizures
exposure
Naturally occurring ALDH7A1 mutations abolishing antiquitin dehydrogenase activity
limitations
Human genetics with a defined biochemical consequence. It establishes the chemistry of the cofactor loss; it does not measure brain GABA in the affected children.
nutrient_topic
GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. · Gamma-aminobutyric acid
organism
Human
plain_language
A metabolite that piles up when one enzyme is missing chemically destroys the cofactor a different enzyme needs.
primary_references
[gb-p16491085] Mutations in antiquitin in individuals with pyridoxine-dependent seizures. (2006). https://pubmed.ncbi.nlm.nih.gov/16491085/ DOI: 10.1038/nm1366
tissue_or_cell_type
Whole body
trigger_kind
machinery_impairment Imported condition classification; unverified.
GABA: a ligand with no sign of its own, the cofactor that limits its synthesis, the barrier that keeps it out of the brain, and the immune settings where the same molecule protects and harms (2026-09-22) · lines 118–129
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Gene analysis and metabolite measurement in children with pyridoxine-dependent seizures · source_derived_draft · unverified_draft
### gb-a-metabolite-destroys-the-cofactor Children with pyridoxine-dependent seizures have mutations in the ALDH7A1 gene which encodes antiquitin, these mutations abolish the activity of antiquitin as a delta-1-piperideine-6-carboxylate to alpha-aminoadipic semialdehyde dehydrogenase, the accumulating delta-1-piperideine-6-carboxylate inactivates pyridoxal 5-phosphate by forming a Knoevenagel condensation product, and measurement of urinary alpha-aminoadipic semialdehyde provides a simple way of confirming the diagnosis. Condition category: machinery_impairment nutrient_topic: GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. plain_language: A metabolite that piles up when one enzyme is missing chemically destroys the cofactor a different enzyme needs. organism: Human tissue_or_cell_type: Whole body experimental_model: Gene analysis and metabolite measurement in children with pyridoxine-dependent seizures limitations: Human genetics with a defined biochemical consequence. It establishes the chemistry of the cofactor loss; it does not measure brain GABA in the affected children. exposure: Naturally occurring ALDH7A1 mutations abolishing antiquitin dehydrogenase activity evidence_span: {"source_cache": "artifacts/gaba-research/16491085.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "da61b07cc71e16803fe09321738c7a6c8d2cbac0dff2b189b9f2586ce5950bfa", "start_char": 0, "end_char": 550, "text_sha256": "da61b07cc71e16803fe09321738c7a6c8d2cbac0dff2b189b9f2586ce5950bfa"} [gb-p16491085] Mutations in antiquitin in individuals with pyridoxine-dependent seizures. (2006). https://pubmed.ncbi.nlm.nih.gov/16491085/ DOI: 10.1038/nm1366
Complete structured claim and evidence
Hypophosphatasia is a rare inherited disorder of bone and mineral metabolism caused by loss-of-function mutations in the ALPL gene, characterized by defective bone and tooth mineralisation associated with low serum and bone alkaline phosphatase activity, severe forms may present with neurological problems such as seizures, hypotonia and irritability, and here an infantile hypophosphatasia patient presented with pyridoxine-responsive seizures and a novel homozygous mutation in the ALPL gene was detected, with a limited number of such patients in the literature.
Tissue-nonspecific alkaline phosphatase ALPL / TNAP → Pyridoxine-responsive seizures in infantile hypophosphatasia source_derived_draftungraded
Experimental context and source evidence
availability_state
machinery_impairment Imported condition classification; unverified.
evidence_span
{"source_cache": "artifacts/gaba-research/27086862.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "cb18a717a009e567b4480c6826b39f15109745dbb646c752ad66376b6b107854", "start_char": 0, "end_char": 1299, "text_sha256": "cb18a717a009e567b4480c6826b39f15109745dbb646c752ad66376b6b107854"}
experimental_model
Case report of an infant with a novel homozygous ALPL mutation
exposure
Loss-of-function ALPL mutation with pyridoxine-responsive seizures
limitations
A single case report. It shows the association in one patient and cannot establish how often it occurs or the mechanism by which the cofactor becomes unavailable.
nutrient_topic
GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. · Gamma-aminobutyric acid
organism
Human
plain_language
A child whose alkaline phosphatase does not work had seizures that only pyridoxine controlled.
primary_references
[gb-p27086862] Pyridoxine-Responsive Seizures in Infantile Hypophosphatasia and a Novel Homozygous Mutation in ALPL Gene. (2016). https://pubmed.ncbi.nlm.nih.gov/27086862/ DOI: 10.4274/jcrpe.2798
tissue_or_cell_type
Bone and nervous system
trigger_kind
machinery_impairment Imported condition classification; unverified.
GABA: a ligand with no sign of its own, the cofactor that limits its synthesis, the barrier that keeps it out of the brain, and the immune settings where the same molecule protects and harms (2026-09-22) · lines 131–142
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Case report of an infant with a novel homozygous ALPL mutation · source_derived_draft · unverified_draft
### gb-losing-the-phosphatase-costs-the-cofactor Hypophosphatasia is a rare inherited disorder of bone and mineral metabolism caused by loss-of-function mutations in the ALPL gene, characterized by defective bone and tooth mineralisation associated with low serum and bone alkaline phosphatase activity, severe forms may present with neurological problems such as seizures, hypotonia and irritability, and here an infantile hypophosphatasia patient presented with pyridoxine-responsive seizures and a novel homozygous mutation in the ALPL gene was detected, with a limited number of such patients in the literature. Condition category: machinery_impairment nutrient_topic: GABA research collection; topical membership is not evidence of a direct clinical effect, and the sign of a GABA response depends on the chloride gradient of the cell it was measured in. plain_language: A child whose alkaline phosphatase does not work had seizures that only pyridoxine controlled. organism: Human tissue_or_cell_type: Bone and nervous system experimental_model: Case report of an infant with a novel homozygous ALPL mutation limitations: A single case report. It shows the association in one patient and cannot establish how often it occurs or the mechanism by which the cofactor becomes unavailable. exposure: Loss-of-function ALPL mutation with pyridoxine-responsive seizures evidence_span: {"source_cache": "artifacts/gaba-research/27086862.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "cb18a717a009e567b4480c6826b39f15109745dbb646c752ad66376b6b107854", "start_char": 0, "end_char": 1299, "text_sha256": "cb18a717a009e567b4480c6826b39f15109745dbb646c752ad66376b6b107854"} [gb-p27086862] Pyridoxine-Responsive Seizures in Infantile Hypophosphatasia and a Novel Homozygous Mutation in ALPL Gene. (2016). https://pubmed.ncbi.nlm.nih.gov/27086862/ DOI: 10.4274/jcrpe.2798
Complete structured claim and evidence

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Situations it appears in

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In the sources

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Open hypotheses

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This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.

Pyridoxine-dependent seizures