Evidence map›Paper›PMID 9140109›Full record

ArticleJapanese journal of cancer research : Gann1997

Intragenic Tsc2 somatic mutations as Knudson's second hit in spontaneous and chemically induced renal carcinomas in the Eker rat model.

T Kobayashi, S Urakami, Y Hirayama, T Yamamoto, M Nishizawa, T Takahara, Y Kubo, O Hino

Open access · bronzeAbstract readComparative Study
In one paragraph

Article in Japanese journal of cancer research : Gann, 1997. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.

0numbers the graph read from it
0cells of the map it votes in
17citing 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.

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

17 citing papers in PubMed, 56 citations in OpenAlex.

  1. Tuberous sclerosis complex: a complex case.Cold Spring Harbor molecular case studies · 2022
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

8 authors at 1 institution in 1 country.

T KobayashiDepartment of Experimental Pathology, Cancer Institute, Tokyo.
S Urakami
Y Hirayama
T Yamamoto
M Nishizawa
T Takahara
Y Kubo
O Hino
The Cancer Institute Hospital · JP

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

We searched for the rat homologue of the human tuberous sclerosis (TSC2) gene mutations in loss of heterozygosity (LOH)-negative Eker rat renal carcinomas (RCs) by polymerase chain reaction-single-strand conformational polymorphism (PCR-SSCP) analysis using 45 primer sets covering all 41 coding exons and one leader exon including splicing donor/acceptor sites. We have identified intragenic somatic mutations in 7 of 21 spontaneous RCs, including one cell line (33%), and in 3 of 9 (33%) N-ethyl-N-nitrosourea (ENU)-induced LOH-negative RCs. Interestingly, five mutations in the spontaneous RCs were either deletion or duplication (5/7 = 71%). In contrast, all three in ENU-induced RCs were base substitutions (3/3 = 100%), as expected. Thus, a qualitative difference in the second hit might exist between spontaneous and ENU-induced mutations (e.g., deletion or duplication versus point mutation). By a direct cloning approach utilizing the restriction length difference caused by germline insertional mutation or reverse transcriptase-PCR analysis in two applicable cases, we could clearly show the presence of intragenic somatic mutations in the second copy (wild-type) of the Tsc2 gene. This is the first demonstration at the DNA sequence level of the validity of Knudson's two-hits hypothesis in the Tsc2 gene.

Indexed as

Chromosome DeletionGenes, Tumor SuppressorIntronsMutationPolymerase Chain ReactionPolymorphism, Single-Stranded ConformationalAllelesAnimalsDNA PrimersDNA Transposable ElementsEthylnitrosoureaFrameshift MutationHumansKidney NeoplasmsRatsRats, Inbred StrainsDNA PrimersDNA Transposable ElementsEthylnitrosoureaRepressor ProteinsTSC2 protein, humanTsc2 protein, ratTuberous Sclerosis Complex 2 ProteinTumor Suppressor Proteins

Identifiers

PMID9140109
PMCPMC5921374
OpenAlexW2021738197

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.