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ArticleKidney international reports2020

Trimerization and Genotype-Phenotype Correlation of

Misato Kamura, Tomohiko Yamamura, Kohei Omachi, Mary Ann Suico, Kandai Nozu, Shota Kaseda, Jun Kuwazuru, Tsuyoshi Shuto, Kazumoto Iijima, Hirofumi Kai

Open access · goldAbstract read
In one paragraph

Article in Kidney international reports, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.

0numbers the graph read from it
0cells of the map it votes in
15citing papers in PubMed
2.5field-weighted citation impact, top 11% 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.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

15 citing papers in PubMed, 30 citations in OpenAlex.

  1. Review
  2. A NovelGenes · 2026
    Article
  3. Article
  4. Article
  5. Genetic study of Alport syndrome in Tunisia.Pediatric nephrology (Berlin, Germany) · 2025
    Article
  6. Article
  7. The NM_033380.2 transcript of theFrontiers in genetics · 2024
    Article
  8. Article
  9. Article
  10. Article
  11. Article
  12. Review
  13. Last Nucleotide Substitutions ofKidney international reports · 2022
    Article
  14. Review
  15. Article
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

10 authors at 3 institutions in 2 countries.

Misato KamuraDepartment of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan.
Tomohiko YamamuraDepartment of Pediatrics, Graduate School of Medicine, Kobe University, Kobe, Japan.
Kohei OmachiDepartment of Medicine, Division of Nephrology, Washington University School of Medicine, St. Louis, Missouri, USA.
Mary Ann SuicoDepartment of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan.
Kandai NozuDepartment of Pediatrics, Graduate School of Medicine, Kobe University, Kobe, Japan.
Shota KasedaDepartment of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan.
Jun KuwazuruDepartment of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan.
Tsuyoshi ShutoDepartment of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan.
Kazumoto IijimaDepartment of Pediatrics, Graduate School of Medicine, Kobe University, Kobe, Japan.
Hirofumi KaiDepartment of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan.
Kumamoto University · JPKobe University · JPWashington University in St. Louis · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

introductionAlport syndrome is a hereditary glomerulonephritis that results from the disruption of collagen α345(IV) heterotrimerization caused by mutation in

methodsWe selected 9 α5(IV) missense mutants with typical glycine substitutions that clinically differed in disease progression. To quantify the trimerization of each mutant, split nanoluciferase-fused α3/α5 mutants and α4 were transfected into the cells, and intracellular and secreted heterotrimer were detected by luminescence using an assay that we developed previously.

resultsTrimer formation and secretion patterns tended to be similar to the wild type in most of the mutations that did not show proteinuria at a young age. On the other hand, trimer secretion was significantly reduced in all the mutations that showed proteinuria and early onset of renal failure. One of these mutants has low ability of intracellular trimer formation, and the others had the defect of low-level secretion. In addition, the mutant that is assumed to be nonpathogenic has similar trimer formation and secretion pattern as wild-type α5(IV).

conclusionThe result of cell-based α345(IV) heterotrimer formation assay was largely correlated with clinical genotype-phenotype. These trimerization assessments provide additional phenotypic considerations and may help to distinguish between pathogenic and nonpathogenic mutations.

Indexed as

Alport syndromeCOL4A5 mutationcollagen trimerizationgenotype–phenotypesplit nanoluciferase

Identifiers

PMID32405592
PMCPMC7210609
OpenAlexW3003999016

What OpenQuestion holds

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Registered trials

None linked

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.