Evidence map›Paper›PMID 8508766›Full record

ArticleThe EMBO journal1993

Deletion of the immunoglobulin kappa chain intron enhancer abolishes kappa chain gene rearrangement in cis but not lambda chain gene rearrangement in trans.

S Takeda, Y R Zou, H Bluethmann, D Kitamura, U Muller, K Rajewsky

Open access · greenAbstract read
In one paragraph

Article in The EMBO journal, 1993. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 41 papers.

0numbers the graph read from it
0cells of the map it votes in
41citing papers in PubMed
18.4field-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

41 citing papers in PubMed, 166 citations in OpenAlex.

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  15. Receptor selection in B and T lymphocytes.Annual review of immunology · 2000
    Review
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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

6 authors at 2 institutions in 1 country.

S TakedaBasel Institute for Immunology, Switzerland.
Y R Zou
H Bluethmann
D Kitamura
U Muller
K Rajewsky
Institute of Molecular and Clinical Ophthalmology Basel · CHRoche (Switzerland) · CH

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Immunoglobulins (Ig) secreted from a plasma cell contain either kappa or lambda light chains, but not both. This phenomenon is termed isotypic kappa-lambda exclusion. While kappa-producing cells have their lambda chain genes in germline configuration, in most lambda-producing cells the kappa chain genes are either non-productively rearranged or deleted. To investigate the molecular mechanism for isotypic kappa-lambda exclusion, in particular the role of the Ig kappa intron enhancer, we replaced this enhancer by a neomycin resistance (neoR) gene in embryonic stem (ES) cells. B cells heterozygous for the mutation undergo V kappa-J kappa recombination exclusively in the intact Ig kappa locus but not in the mutated Ig kappa locus. Homozygous mutant mice exhibited no rearrangements in their Ig kappa loci. However, splenic B cell numbers were only slightly reduced as compared with the wild-type, and all B cells expressed lambda chain bearing surface Ig. These findings demonstrate that rearrangement in the Ig kappa locus is not essential for lambda gene rearrangement. We also generated homozygous mutant mice in which the neoR gene was inserted at the 3' end of the Ig kappa intron enhancer. Unexpectedly, mere insertion of the neoR gene showed some suppressive effect on V kappa-J kappa recombination. However, the much more pronounced inhibition of V kappa-J kappa recombination by the replacement of the Ig kappa intron enhancer suggests that this enhancer is essential for V kappa-J kappa recombination.

Indexed as

Enhancer Elements, GeneticGene Rearrangement, B-Lymphocyte, Light ChainIntronsSequence DeletionAnimalsBase SequenceChimeraDNA, RecombinantFemaleHeterozygoteHomozygoteImmunoglobulin kappa-ChainsImmunoglobulin lambda-ChainsMaleMiceMice, Inbred C57BLDNA, RecombinantImmunoglobulin kappa-ChainsImmunoglobulin lambda-Chains

Identifiers

PMID8508766
PMCPMC413463
OpenAlexW1486439009

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.