Serveur d'exploration sur le lymphœdème

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Clinical and genetic study of 46 Italian patients with primary lymphedema.

Identifieur interne : 004443 ( Main/Exploration ); précédent : 004442; suivant : 004444

Clinical and genetic study of 46 Italian patients with primary lymphedema.

Auteurs : S. Michelini [Italie] ; D. Degiorgio ; M. Cestari ; D. Corda ; M. Ricci ; M. Cardone ; A. Mander ; L. Famoso ; E. Contini ; R. Serrani ; L. Pinelli ; S. Cecchin ; M. Bertelli

Source :

RBID : pubmed:22768468

Descripteurs français

English descriptors

Abstract

Primary lymphedema is characterized by altered morphological development of lymphatic vessels causing fluid accumulation in interstitial spaces. In familial forms, it is primarily transmitted as a dominant Mendelian trait with heterozygous mutations in genes involved in lymphangiogenesis. We used PCR and direct sequencing to analyze the region of the fms-related tyrosine kinase 4 (FLT4) gene encoding the "tyrosine-kinase domain" and the single exon of the forkhead box C2 (FOXC2) gene in 46 Italian probands with primary lymphedema, 42 of whom had familial forms. We identified 12 mutations in 12 patients (12/46, 26%), six in the FLT4 gene and six in the FOXC2 gene. Most of the mutations (9/12, 75%) were new, and none were identified in 100 healthy subjects or listed in the NCBI dbSNP. A clear relation emerged between genotype and phenotype because 4/5 (80%) probands with onset at birth showed FLT4 mutations and 4/5 (80%) probands without distichiasis and with FOXC2 mutations had an amino-acid substitution outside the forkhead domain. Besides the allelic heterogeneity shown by unique mutations in each proband, the absence of mutations in almost 75% of familial cases of primary lymphedema also suggests genetic heterogeneity.

PubMed: 22768468


Affiliations:


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Le document en format XML

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<term>Forkhead Transcription Factors (genetics)</term>
<term>Genetic Predisposition to Disease</term>
<term>Humans</term>
<term>Italy</term>
<term>Lymphangiogenesis (genetics)</term>
<term>Lymphedema (genetics)</term>
<term>Lymphedema (pathology)</term>
<term>Lymphedema (physiopathology)</term>
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<term>Humains</term>
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<term>Jeune adulte</term>
<term>Lymphangiogenèse (génétique)</term>
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<term>DNA Mutational Analysis</term>
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<term>Genetic Predisposition to Disease</term>
<term>Humans</term>
<term>Male</term>
<term>Mutation</term>
<term>Phenotype</term>
<term>Polymerase Chain Reaction</term>
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<term>Mâle</term>
<term>Phénotype</term>
<term>Prédisposition génétique à une maladie</term>
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<div type="abstract" xml:lang="en">Primary lymphedema is characterized by altered morphological development of lymphatic vessels causing fluid accumulation in interstitial spaces. In familial forms, it is primarily transmitted as a dominant Mendelian trait with heterozygous mutations in genes involved in lymphangiogenesis. We used PCR and direct sequencing to analyze the region of the fms-related tyrosine kinase 4 (FLT4) gene encoding the "tyrosine-kinase domain" and the single exon of the forkhead box C2 (FOXC2) gene in 46 Italian probands with primary lymphedema, 42 of whom had familial forms. We identified 12 mutations in 12 patients (12/46, 26%), six in the FLT4 gene and six in the FOXC2 gene. Most of the mutations (9/12, 75%) were new, and none were identified in 100 healthy subjects or listed in the NCBI dbSNP. A clear relation emerged between genotype and phenotype because 4/5 (80%) probands with onset at birth showed FLT4 mutations and 4/5 (80%) probands without distichiasis and with FOXC2 mutations had an amino-acid substitution outside the forkhead domain. Besides the allelic heterogeneity shown by unique mutations in each proband, the absence of mutations in almost 75% of familial cases of primary lymphedema also suggests genetic heterogeneity.</div>
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