Component
ROMK1 splice isoform
ROMK1 isoform of KCNJ1 studied in heterologous expression; distinct from ROMK2.
2 recorded relationships. Experimental role, claim status and evidence remain attached to each record.
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.
Other things that act on it
Enzymes, hormones, genes, and other components with a recorded effect. These are not nutrients, so they do not count toward the arrows above. Each finding names the chapter that recorded it.
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.
What it acts on
Romk1-specific deletion blunted high-K-induced collecting-tubule ROMK surface recruitment and caused hyperkalemia during that challenge.
Experimental context and source evidence
- availability_state
- machinery_impairment Imported condition classification; unverified.
- evidence_location
- Abstract; high-K channel-number and localization comparison.
- experimental_model
- Isoform-specific knockout; high-K diet
- limitations
- Baseline channel gating and NKCC2 phenotype were preserved; not equivalent to pan-ROMK deletion.
- nutrient_topic
- Potassium research collection; topical membership is not evidence of a direct dietary effect. · Potassium
- organism
- Mus musculus
- plain_language
- This ROMK splice isoform helps increase potassium exit-channel availability when intake rises.
- primary_references
- [romk1-2016-isoform] Romk1 Knockout Mice Do Not Produce Bartter Phenotype but Exhibit Impaired K Excretion (2016). https://pmc.ncbi.nlm.nih.gov/articles/PMC4777858/ DOI: 10.1074/jbc.M115.707877
- tissue_or_cell_type
- Collecting tubule
- trigger_kind
- machinery_impairment Imported condition classification; unverified.
Potassium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 344–354
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Isoform-specific knockout; high-K diet · source_derived_draft · unverified_draft
### renal-romk1-needed-high-k-adaptation Romk1-specific deletion blunted high-K-induced collecting-tubule ROMK surface recruitment and caused hyperkalemia during that challenge. Condition category: machinery_impairment nutrient_topic: Potassium research collection; topical membership is not evidence of a direct dietary effect. plain_language: This ROMK splice isoform helps increase potassium exit-channel availability when intake rises. organism: Mus musculus tissue_or_cell_type: Collecting tubule experimental_model: Isoform-specific knockout; high-K diet limitations: Baseline channel gating and NKCC2 phenotype were preserved; not equivalent to pan-ROMK deletion. evidence_location: Abstract; high-K channel-number and localization comparison. [romk1-2016-isoform] Romk1 Knockout Mice Do Not Produce Bartter Phenotype but Exhibit Impaired K Excretion (2016). https://pmc.ncbi.nlm.nih.gov/articles/PMC4777858/ DOI: 10.1074/jbc.M115.707877
Complete structured claim and evidence
What acts on it
Cytoplasmic Mg2+ caused voltage-dependent reduction of ROMK1 outward single-channel current without reducing channel open probability.
Experimental context and source evidence
- cross_nutrient
- magnesium -> potassium
- experimental_model
- Heterologous channel expression and patch-clamp
- limitations
- Excised-patch channel behavior does not quantify whole-body potassium loss in humans.
- nutrient_topic
- Magnesium research collection; topical membership is not evidence of a direct dietary effect. · Magnesium
- organism
- Xenopus laevis host; mammalian ROMK channel
- plain_language
- Mg inside the cell can obstruct outward potassium flow through ROMK; this is a conduction effect, not evidence that the channel disappears.
- primary_references
- [nichols-1994-romk1] Mg(2+)-dependent inward rectification of ROMK1 potassium channels expressed in Xenopus oocytes (1994). https://pubmed.ncbi.nlm.nih.gov/8057249/ DOI: 10.1113/jphysiol.1994.sp020141
- tissue_or_cell_type
- Oocyte membrane
Magnesium: cross-nutrient mechanisms and deficiency (2026-09-17) · lines 104–114
AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Heterologous channel expression and patch-clamp · source_derived_draft · unverified_draft
### mg-romk1-outward-current-block Cytoplasmic Mg2+ caused voltage-dependent reduction of ROMK1 outward single-channel current without reducing channel open probability. Condition category: normal nutrient_topic: Magnesium research collection; topical membership is not evidence of a direct dietary effect. plain_language: Mg inside the cell can obstruct outward potassium flow through ROMK; this is a conduction effect, not evidence that the channel disappears. organism: Xenopus laevis host; mammalian ROMK channel tissue_or_cell_type: Oocyte membrane experimental_model: Heterologous channel expression and patch-clamp limitations: Excised-patch channel behavior does not quantify whole-body potassium loss in humans. cross_nutrient: magnesium -> potassium [nichols-1994-romk1] Mg(2+)-dependent inward rectification of ROMK1 potassium channels expressed in Xenopus oocytes (1994). https://pubmed.ncbi.nlm.nih.gov/8057249/ DOI: 10.1113/jphysiol.1994.sp020141
Complete structured claim and evidence
The events it takes part in
A mechanism often involves more than two components. These are the full events, with every participant and its role.
Situations it appears in
Low-supply and faulty-machinery situations recorded in the chapters where this component plays a part.
In the sources
Preserved passages that mention this component, quoted exactly. Open one to read it in context.
Open hypotheses
Proposed ideas that involve this component. They are labeled as hypotheses and do not change any recorded statement.
This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.