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Mutation in IFT80 in a fetus with the phenotype of Verma-Naumoff provides molecular evidence for Jeune-Verma-Naumoff dysplasia spectrum

Identifieur interne : 007D08 ( Main/Curation ); précédent : 007D07; suivant : 007D09

Mutation in IFT80 in a fetus with the phenotype of Verma-Naumoff provides molecular evidence for Jeune-Verma-Naumoff dysplasia spectrum

Auteurs : Denise P. Cavalcanti [Brésil, France] ; Celine Huber [France] ; Kim-Hanh Le Quan Sang [France] ; Geneviève Baujat [France] ; Felicity Collins [Australie] ; Anne-Lise Delezoide [France] ; Nathalie Dagoneau [France] ; Martine Le Merrer [France] ; Jelena Martinovic [France] ; Marcos Fernando S. Mello [Brésil] ; Michel Vekemans [France] ; Arnold Munnich [France] ; Valerie Cormier-Daire [France]

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RBID : ISTEX:C531FE51896474F7A4BA6C32CE98B59D004FA3A7

English descriptors

Abstract

Background The lethal group of short-rib polydactyly (SRP) includes type I (Saldino-Noonan; MIM 263530), type II (Majewski; MIM 263520), type III (Verma-Naumoff; MIM 263510) and type IV (Beemer-Langer; MIM 269860). Jeune and Ellis-van Creveld dysplasias also used to be classified in the SRP group. Recently, mutations in a gene encoding a protein involved in intraflagellar transport, IFT80, have been identified in 3/39 patients with Jeune dysplasia but no extraskeletal manifestation. Methods Because of clinical and radiological similarities between Jeune dysplasia and the other lethal types of SRP, the authors decided to investigate IFT80 in a cohort of fetuses with the lethal forms of SRP (Majewski, Verma-Naumoff and Beemer-Langer) and antenatally diagnosed cases of Jeune dysplasia. Fifteen fetuses were identified. A double-molecular approach was adopted. For consanguineous families and for those with recurrent sibs, a haplotype analysis around the gene locus was first performed, and, for the others, all the coding exons of IFT80 were directly sequenced. Results Using the haplotype approach for two families, the authors excluded the IFT80 region as a candidate for them. Direct sequencing of IFT80 in the other 13 cases showed a G-to-C transversion in exon 8 (G241R) in only one SRP case closely related to the type III phenotype. Conclusions The findings show that mutations in IFT80 can also be responsible for a lethal form of SRP and provide the molecular basis for the Jeune-Verma-Naumoff dysplasia spectrum.

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DOI: 10.1136/jmg.2009.069468

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<term>Abnormal</term>
<term>Abnormal hips</term>
<term>Beemer</term>
<term>Brazilian northeast</term>
<term>Case report</term>
<term>Cilium</term>
<term>Cleft</term>
<term>Coding exons</term>
<term>Compound heterozygosity</term>
<term>Consanguineous families</term>
<term>Dysplasia</term>
<term>Dysplasia spectrum</term>
<term>Ethnic background</term>
<term>Exon</term>
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<term>Inclusion criteria</term>
<term>Intestinal malrotation</term>
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<term>Lethal form</term>
<term>Lethal forms</term>
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<term>Metaphyseal irregularity</term>
<term>Molecular basis</term>
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<term>Mutation</term>
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<term>Ndings</term>
<term>Necker hospital</term>
<term>Parental consanguinity</term>
<term>Partial loss</term>
<term>Phenotype</term>
<term>Polydactyly</term>
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<term>Postaxial polydactyly</term>
<term>Preaxial</term>
<term>Preaxial polydactyly</term>
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<term>Pulmonary hypoplasia</term>
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<term>Radiological features</term>
<term>Radiological similarities</term>
<term>Recurrent sibs</term>
<term>Rib</term>
<term>Short bone</term>
<term>Short limbs</term>
<term>Short ribs</term>
<term>Short syndrome</term>
<term>Single mutation</term>
<term>Skeletal dysplasias</term>
<term>Small cities</term>
<term>Smooth ends</term>
<term>Syndrome</term>
<term>Thoracic</term>
<term>Trident</term>
<term>Trident appearance</term>
<term>Tubular bones</term>
<term>Typical radiological features</term>
<term>Verma</term>
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<term>Abnormal</term>
<term>Abnormal hips</term>
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<term>Brazilian northeast</term>
<term>Case report</term>
<term>Cilium</term>
<term>Cleft</term>
<term>Coding exons</term>
<term>Compound heterozygosity</term>
<term>Consanguineous families</term>
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<term>Dysplasia spectrum</term>
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<term>Gene encoding</term>
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<term>Haplotype study</term>
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<term>Hypoplasia</term>
<term>Hypoplasia pubis</term>
<term>Inclusion criteria</term>
<term>Intestinal malrotation</term>
<term>Irregular metaphyses</term>
<term>Jeune</term>
<term>Jeune dysplasia</term>
<term>Jeune syndrome</term>
<term>Lethal form</term>
<term>Lethal forms</term>
<term>Lethal group</term>
<term>Long bone</term>
<term>Long bones</term>
<term>Majewski</term>
<term>Metaphyseal irregularity</term>
<term>Molecular basis</term>
<term>Multicystic kidneys</term>
<term>Mutation</term>
<term>Narrow thorax</term>
<term>Ndings</term>
<term>Necker hospital</term>
<term>Parental consanguinity</term>
<term>Partial loss</term>
<term>Phenotype</term>
<term>Polydactyly</term>
<term>Postaxial</term>
<term>Postaxial polydactyly</term>
<term>Preaxial</term>
<term>Preaxial polydactyly</term>
<term>Prenatal ultrasound examination</term>
<term>Pulmonary hypoplasia</term>
<term>Radiological</term>
<term>Radiological features</term>
<term>Radiological similarities</term>
<term>Recurrent sibs</term>
<term>Rib</term>
<term>Short bone</term>
<term>Short limbs</term>
<term>Short ribs</term>
<term>Short syndrome</term>
<term>Single mutation</term>
<term>Skeletal dysplasias</term>
<term>Small cities</term>
<term>Smooth ends</term>
<term>Syndrome</term>
<term>Thoracic</term>
<term>Trident</term>
<term>Trident appearance</term>
<term>Tubular bones</term>
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<term>Verma</term>
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<div type="abstract">Background The lethal group of short-rib polydactyly (SRP) includes type I (Saldino-Noonan; MIM 263530), type II (Majewski; MIM 263520), type III (Verma-Naumoff; MIM 263510) and type IV (Beemer-Langer; MIM 269860). Jeune and Ellis-van Creveld dysplasias also used to be classified in the SRP group. Recently, mutations in a gene encoding a protein involved in intraflagellar transport, IFT80, have been identified in 3/39 patients with Jeune dysplasia but no extraskeletal manifestation. Methods Because of clinical and radiological similarities between Jeune dysplasia and the other lethal types of SRP, the authors decided to investigate IFT80 in a cohort of fetuses with the lethal forms of SRP (Majewski, Verma-Naumoff and Beemer-Langer) and antenatally diagnosed cases of Jeune dysplasia. Fifteen fetuses were identified. A double-molecular approach was adopted. For consanguineous families and for those with recurrent sibs, a haplotype analysis around the gene locus was first performed, and, for the others, all the coding exons of IFT80 were directly sequenced. Results Using the haplotype approach for two families, the authors excluded the IFT80 region as a candidate for them. Direct sequencing of IFT80 in the other 13 cases showed a G-to-C transversion in exon 8 (G241R) in only one SRP case closely related to the type III phenotype. Conclusions The findings show that mutations in IFT80 can also be responsible for a lethal form of SRP and provide the molecular basis for the Jeune-Verma-Naumoff dysplasia spectrum.</div>
</front>
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