Evidence map›Paper›PMID 9892664›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America1999

Claudin multigene family encoding four-transmembrane domain protein components of tight junction strands.

K Morita, M Furuse, K Fujimoto, S Tsukita

Abstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 1999. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 378 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
378citing papers in PubMed, 1 pooled it
44.4field-weighted citation impact, top 1% 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

378 citing papers in PubMed, 1 synthesis or guideline pooled it, 1,114 citations in OpenAlex.

  1. Pooled it
  2. Trial
  3. Targeting claudins in cancer.Nature reviews. Drug discovery · 2026
    Review
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  15. Occludin acts as a dynein adaptor regulating permeability and collateral angiogenesis.Proceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  16. Review
  17. Article
  18. Endothelial mitochondria in the blood-brain barrier.Fluids and barriers of the CNS · 2025
    Review
  19. Article
  20. Article

318 more citing papers are in PubMed but not listed here.

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

4 authors at 1 institution in 1 country.

K MoritaDepartment of Cell Biology, Faculty of Medicine, Kyoto University, Sakyo-ku, Kyoto 606, Japan.
M Furuse
K Fujimoto
S Tsukita
Kyoto University · JP

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Two related integral membrane proteins, claudin-1 and -2, recently were identified as novel components of tight junction (TJ) strands. Here, we report six more claudin-like proteins, indicating the existence of a claudin gene family. Three of these were reported previously as RVP1, Clostridium perfringens enterotoxin receptor, and TMVCF, but their physiological functions were not determined. Through similarity searches followed by PCR, we isolated full length cDNAs of mouse RVP1, Clostridium perfringens enterotoxin receptor, and TMVCF as well as three mouse claudin-like proteins and designated them as claudin-3 to -8, respectively. All of these claudin family members showed similar patterns on hydrophilicity plots, which predicted four transmembrane domains in each molecule. Northern blotting showed that the tissue distribution pattern varied significantly, depending on claudin species. Similarly to claudin-1 and -2, when these claudins were HA-tagged and introduced into cultured Madin-Darby canine kidney cells, all showed a tendency to concentrate at TJs. Immunofluorescence and immunoelectron microscopy with polyclonal antibodies specific for claudin-3, -4, or -8 revealed that these molecules were exclusively concentrated at TJs in the liver and/or kidney. These findings indicated that multiple claudin family members are involved in the formation of TJ strands in various tissues.

Indexed as

Amino Acid SequenceAnimalsCell LineClaudin-1ClaudinsCloning, MolecularFluorescent Antibody TechniqueLiverMembrane ProteinsMiceMicroscopy, ImmunoelectronMolecular Sequence DataPeptide FragmentsPhylogenyRNA, MessengerSequence Analysis, DNAClaudin-1ClaudinsCldn1 protein, mouseCldn2 protein, mouseMembrane ProteinsPeptide FragmentsRNA, Messenger

Identifiers

PMID9892664
PMCPMC15167
OpenAlexW2034626424

What OpenQuestion holds

Textmetadata
Read underepoch 390

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.