Evidence map›Paper›PMID 27261973›Full record

ArticleMolecular medicine (Cambridge, Mass.)2016

Mutations in the Na(+)/citrate cotransporter NaCT (SLC13A5) in pediatric patients with epilepsy and developmental delay.

Jenna Klotz, Brenda E Porter, Claire Colas, Avner Schlessinger, Ana M Pajor

2 registry-linked trialsOpen access · goldAbstract read
In one paragraph

Article in Molecular medicine (Cambridge, Mass.), 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to 2 registered trials, which are not on this map. Cited by 50 papers.

0numbers the graph read from it
0cells of the map it votes in
50citing papers in PubMed
2.6field-weighted citation impact, top 10% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

NCT04681781 enrolling by invitationnot on this mapstarted 2021, after this paper: background citation

SLC13A5 Deficiency: a Prospective Natural History Study - Remote Only (International)

TypeobservationalSponsorTESS Research FoundationRan2021 to 2025Enrolled20ConditionsCitrate Transporter Deficiency, Epilepsy, Rare Diseases, Movement Disorders
NCT06144957 enrolling by invitationnot on this mapstarted 2021, after this paper: background citation

SLC13A5 Deficiency: A Prospective Natural History Study - United States Only

TypeobservationalSponsorTESS Research FoundationRan2021 to 2025Enrolled17ConditionsCitrate Transporter Deficiency, Epilepsy, Rare Diseases, Movement Disorders
3 · Its place in the literature

Who cites it

50 citing papers in PubMed, 78 citations in OpenAlex.

  1. Article
  2. Citrate Transporter NaCT and Enamel Mineralization: TheInternational journal of molecular sciences · 2026
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 3 institutions in 1 country.

Jenna KlotzDepartment of Neurology, Stanford University School of Medicine, Palo Alto, CA 94305.
Brenda E PorterDepartment of Neurology, Stanford University School of Medicine, Palo Alto, CA 94305.
Claire ColasDepartment of Pharmacology and Systems Therapeutics, Icahn School of Medicine at Mount Sinai, New York, NY 10029.
Avner SchlessingerDepartment of Pharmacology and Systems Therapeutics, Icahn School of Medicine at Mount Sinai, New York, NY 10029.
Ana M PajorSkaggs School of Pharmacy and Pharmaceutical Sciences, University of California-San Diego, La Jolla, CA 92130-0718.
Icahn School of Medicine at Mount Sinai · USStanford University · USUniversity of California, San Diego · US

Funding

Substrate Specificity Determinants in Nutrient Solute Carrier TransportersR01GM108911 · NIGMS · ICAHN SCHOOL OF MEDICINE AT MOUNT SINAI · PI SCHLESSINGER, AVNER · 2014 to 2022
$3.1M
NIGMS NIH HHS R01 GM108911
6 · The paper itself

Abstract

Mutations in the SLC13A5 gene that codes for the Na(+)/citrate cotransporter, NaCT, are associated with early onset epilepsy, developmental delay and tooth dysplasia in children. In the present study we identify additional SLC13A5 mutations in nine epilepsy patients from six families. To better characterize the syndrome, families with affected children answered questions about the scope of illness and treatment strategies. There are currently no effective treatments, but some anti-epileptic drugs targeting the GABA system reduce seizure frequency. Acetazolamide, a carbonic anhydrase inhibitor and atypical anti-seizure medication decreases seizures in 4 patients. In contrast to previous reports, the ketogenic diet and fasting produce worsening of symptoms. The effects of the mutations on NaCT transport function and protein expression were examined by transient transfections of COS-7 cells. There was no transport activity from any of the mutant transporters, although some of the mutant transporter proteins were present on the plasma membrane. The structural model of NaCT suggests that these mutations can affect helix packing or substrate binding. We tested various treatments, including chemical chaperones and low temperatures, but none improve transport function in the NaCT mutants. Interestingly, coexpression of NaCT and the mutants results in decreased protein expression and activity of the wild-type transporter, indicating functional interaction. In conclusion, our study has identified additional SLC13A5 mutations in patients with chronic epilepsy starting in the neonatal period, with the mutations producing inactive Na(+)/citrate transporters.

Indexed as

MutationAdolescentAnimalsChildChild, PreschoolChlorocebus aethiopsCOS CellsDevelopmental DisabilitiesEpilepsyFemaleGenetic Predisposition to DiseaseHumansMalePedigreeProtein BindingProtein TransportSLC13A5 protein, humanSymporterscitrateepilepsysodiumtooth hypoplasiatransporter

Identifiers

PMID27261973
PMCPMC5023510
OpenAlexW2410203776

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.