Component

ALDH9A1

Independent protein record; interpretation is limited by each linked claim and its study context.

4 recorded relationships. Experimental role, claim status and evidence remain attached to each record.

Read recorded mechanisms Open recursive mind map

How nutrients influence it

Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.

How nutrients reach it in more than one step

Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.

Tracing routes…

What it does

Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.

Recorded relationships

What it acts on

  1. ALDH9/E3 betaine-aldehyde activity was highest in liver, adrenal and kidney among the tested tissues; mRNA peaked in different tissues.

    ALDH9A1 → Betaine aldehyde source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/choline-research/9417993.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "67df6eb3c096ba09a314314ada97fc4c2b9ad555b28b316df3d17501b397c7d4", "start_char": 0, "end_char": 941, "text_sha256": "67df6eb3c096ba09a314314ada97fc4c2b9ad555b28b316df3d17501b397c7d4"}
    experimental_model
    Tissue enzyme activity, immunoblot and RNA comparison
    exposure
    Betaine-aldehyde activity compared with E3/ALDH9 protein and transcript
    limitations
    Transcript abundance differed from protein/activity distribution; RNA is not a universal proxy for flux.
    nutrient_topic
    Choline research collection; topical membership is not evidence of a direct dietary effect. · Choline
    organism
    Human
    plain_language
    The enzyme’s measured activity did not simply track its RNA abundance.
    primary_references
    [choline-p9417993] Tissue distribution of human aldehyde dehydrogenase E3 (ALDH9): comparison of enzyme activity with E3 protein and mRNA distribution. (1997). https://pubmed.ncbi.nlm.nih.gov/9417993/ DOI: 10.1016/s0305-0491(97)00022-9
    tissue_or_cell_type
    Multiple tissues including liver, adrenal, kidney and muscle

    Choline: metabolism, signaling and nutrient connections (2026-09-17) · lines 620–631

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Tissue enzyme activity, immunoblot and RNA comparison · source_derived_draft · unverified_draft

    ### choline-aldh9-activity-distribution ALDH9/E3 betaine-aldehyde activity was highest in liver, adrenal and kidney among the tested tissues; mRNA peaked in different tissues. Condition category: normal nutrient_topic: Choline research collection; topical membership is not evidence of a direct dietary effect. plain_language: The enzyme’s measured activity did not simply track its RNA abundance. organism: Human tissue_or_cell_type: Multiple tissues including liver, adrenal, kidney and muscle experimental_model: Tissue enzyme activity, immunoblot and RNA comparison limitations: Transcript abundance differed from protein/activity distribution; RNA is not a universal proxy for flux. exposure: Betaine-aldehyde activity compared with E3/ALDH9 protein and transcript evidence_span: {"source_cache": "artifacts/choline-research/9417993.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "67df6eb3c096ba09a314314ada97fc4c2b9ad555b28b316df3d17501b397c7d4", "start_char": 0, "end_char": 941, "text_sha256": "67df6eb3c096ba09a314314ada97fc4c2b9ad555b28b316df3d17501b397c7d4"} [choline-p9417993] Tissue distribution of human aldehyde dehydrogenase E3 (ALDH9): comparison of enzyme activity with E3 protein and mRNA distribution. (1997). https://pubmed.ncbi.nlm.nih.gov/9417993/ DOI: 10.1016/s0305-0491(97)00022-9
    Complete structured claim and evidence

  2. Purified human E3 aldehyde dehydrogenase showed betaine-aldehyde dehydrogenase activity, with the activities co-purifying across six columns.

    ALDH9A1 → Betaine aldehyde source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/choline-research/7646513.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "26a654f5b886888ad8c9de61fc59a9fcbaa08dce54a8bd2ba4be43ac637071dc", "start_char": 0, "end_char": 687, "text_sha256": "26a654f5b886888ad8c9de61fc59a9fcbaa08dce54a8bd2ba4be43ac637071dc"}
    experimental_model
    Purified human E3 aldehyde dehydrogenase substrate assays
    exposure
    Betaine aldehyde and 4-aminobutyraldehyde activity across six chromatography steps
    limitations
    E3/ALDH9A1 has demonstrated betaine-aldehyde activity; not an exclusive assignment of every tissue’s betaine synthesis to this enzyme.
    nutrient_topic
    Choline research collection; topical membership is not evidence of a direct dietary effect. · Choline
    organism
    Human enzyme
    plain_language
    This enzyme can process the aldehyde intermediate in the betaine pathway.
    primary_references
    [choline-p7646513] Human aldehyde dehydrogenase E3 isozyme is a betaine aldehyde dehydrogenase. (1995). https://pubmed.ncbi.nlm.nih.gov/7646513/ DOI: 10.1006/bbrc.1995.2168
    tissue_or_cell_type
    Purified protein

    Choline: metabolism, signaling and nutrient connections (2026-09-17) · lines 607–618

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Purified human E3 aldehyde dehydrogenase substrate assays · source_derived_draft · unverified_draft

    ### choline-aldh9-betaine Purified human E3 aldehyde dehydrogenase showed betaine-aldehyde dehydrogenase activity, with the activities co-purifying across six columns. Condition category: normal nutrient_topic: Choline research collection; topical membership is not evidence of a direct dietary effect. plain_language: This enzyme can process the aldehyde intermediate in the betaine pathway. organism: Human enzyme tissue_or_cell_type: Purified protein experimental_model: Purified human E3 aldehyde dehydrogenase substrate assays limitations: E3/ALDH9A1 has demonstrated betaine-aldehyde activity; not an exclusive assignment of every tissue’s betaine synthesis to this enzyme. exposure: Betaine aldehyde and 4-aminobutyraldehyde activity across six chromatography steps evidence_span: {"source_cache": "artifacts/choline-research/7646513.abstract.txt", "locator": "Primary indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "26a654f5b886888ad8c9de61fc59a9fcbaa08dce54a8bd2ba4be43ac637071dc", "start_char": 0, "end_char": 687, "text_sha256": "26a654f5b886888ad8c9de61fc59a9fcbaa08dce54a8bd2ba4be43ac637071dc"} [choline-p7646513] Human aldehyde dehydrogenase E3 isozyme is a betaine aldehyde dehydrogenase. (1995). https://pubmed.ncbi.nlm.nih.gov/7646513/ DOI: 10.1006/bbrc.1995.2168
    Complete structured claim and evidence

  3. Expressing human ALDH9 in bacteria produced NAD+-dependent trimethylaminobutyraldehyde dehydrogenase activity, completing the aldehyde-to-gamma-butyrobetaine step.

    ALDH9A1 → gamma-Butyrobetaine source_derived_draftungraded
    Experimental context and source evidence
    evidence_access
    Primary abstract
    experimental_model
    Recombinant human ALDH9 compared with purified and recombinant rat enzyme.
    limitations
    NAD+ dependence does not establish benefit from niacin supplementation.
    nutrient_topic
    L-Carnitine collection; isomer, preparation, species, exposure and manipulation remain explicit. · L-Carnitine
    plain_language
    A niacin-derived coenzyme participates in making carnitine.
    primary_references
    Molecular and biochemical characterization of rat gamma-trimethylaminobutyraldehyde dehydrogenase and evidence for the involvement of human aldehyde dehydrogenase 9 in carnitine biosynthesis. · 2000 · https://pubmed.ncbi.nlm.nih.gov/10702312/ · DOI 10.1074/jbc.275.10.7390

    L-Carnitine: synthesis, acyl-group transport, fuel selection and nutrient interactions (2026-09-19) · lines 18–24

    AI-assisted research curation; primary-abstract references and experimental limitations individually identified. Not publisher full text. · supports · Recombinant human ALDH9 compared with purified and recombinant rat enzyme. · source_derived_draft · unverified_draft

    ## l-carnitine-aldehyde-step A niacin-derived coenzyme participates in making carnitine. Expressing human ALDH9 in bacteria produced NAD+-dependent trimethylaminobutyraldehyde dehydrogenase activity, completing the aldehyde-to-gamma-butyrobetaine step. Model: Recombinant human ALDH9 compared with purified and recombinant rat enzyme. Limitations: NAD+ dependence does not establish benefit from niacin supplementation. Evidence access: Primary abstract Molecular and biochemical characterization of rat gamma-trimethylaminobutyraldehyde dehydrogenase and evidence for the involvement of human aldehyde dehydrogenase 9 in carnitine biosynthesis. · 2000 · https://pubmed.ncbi.nlm.nih.gov/10702312/ · DOI 10.1074/jbc.275.10.7390
    Complete structured claim and evidence

Where it participates (unsigned role)

  1. Human ALDH9A1 oxidizes trimethylaminobutyraldehyde to gamma-butyrobetaine using NAD+.

    4-Trimethylaminobutyraldehyde → gamma-Butyrobetaine source_derived_draftungraded
    Experimental context and source evidence
    experimental_model
    Rat enzyme purification and recombinant human ALDH9 comparison
    limitations
    ALDH9A1 has additional aldehyde substrates.
    organism
    Homo sapiens
    plain_language
    An aldehyde is converted into the immediate carnitine precursor.
    primary_references
    [vaz2000] Molecular and biochemical characterization of rat gamma-trimethylaminobutyraldehyde dehydrogenase and evidence for the involvement of human aldehyde dehydrogenase 9 in carnitine biosynthesis (2000). https://pubmed.ncbi.nlm.nih.gov/10702312/ DOI: 10.1074/jbc.275.10.7390
    tissue_or_cell_type
    Cytosolic carnitine-biosynthesis reaction

    L-Lysine: mechanism-first literature curation (2026-09-17) · lines 197–205

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Rat enzyme purification and recombinant human ALDH9 comparison · source_derived_draft · unverified_draft

    ### aldh9a1-tmaba-oxidation Human ALDH9A1 oxidizes trimethylaminobutyraldehyde to gamma-butyrobetaine using NAD+. Plain language: An aldehyde is converted into the immediate carnitine precursor. Condition category: normal organism: Homo sapiens tissue_or_cell_type: Cytosolic carnitine-biosynthesis reaction experimental_model: Rat enzyme purification and recombinant human ALDH9 comparison limitations: ALDH9A1 has additional aldehyde substrates. [vaz2000] Molecular and biochemical characterization of rat gamma-trimethylaminobutyraldehyde dehydrogenase and evidence for the involvement of human aldehyde dehydrogenase 9 in carnitine biosynthesis (2000). https://pubmed.ncbi.nlm.nih.gov/10702312/ DOI: 10.1074/jbc.275.10.7390
    Complete structured claim and evidence

In the sources

Preserved passages that mention this component, quoted exactly. Open one to read it in context.

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

    Evidence, AI assistance and curation standards