Defekty v SH3TC2 genu byly nedávno objeveny jako zřejmě častá příčina autosomálně recesivně dědičného demyelinizačného typu Charcot-Marie-Tooth (CMT). Cílem projektu je vyšetření genu pro SH3TC2 u pacientů s demyelinizačním typem dědičné neuropatie Charcot-Marie-Tooth (CMT4C) a zjištění prevalentních mutací v tomto genu v české populaci. To vše pro zavedení efektivní DNA i klinické diagnostiky CMT 4C v ČR. Ze shromáždeného souboru pacientů s chorobou CMT budou vybráni pacienti s demyelinizačním typem neuropatie, u kterých lze předpokládat autosomálně recesivní typ přenosu - přibližně 120 pacientů. Jejich DNA bude vyšetřena pomocí sekvenování všech 17 kódujících exonů genu SH3TC2 . U pacientů s prokázanými mutacemi v SH3TC2 genu bude upřesněn fenotyp abude provedeno DNA vyšetření u dostupných příbuzných k potvrzení segregace mutace s fenotypem CMT4C. V případě nálezu dosud nepopsané mutace bude k upřesnění kausálního vlivu vyšetřen vzorek 100 kontrolních anonymizovaných DNA.; Defects in the SH3TC2 gene have been recently identified in patients with hereditary motor and sensory neuropathy (HMSN). Patients cohort of about 120 urelated individuals with the demyelinating hereditary neuropathy and pedigrees compatible with autosomal recessive mode of inheritance will be selected from a large cohort of CMT patients and will be tested by direct sequencing analysis of all 17 coding exons of the SH3TC2 gene including the flanking intronic regions. New mutations will be tested also in100 control DNA samples. Detailed analysis of clinical and electrophysiological phenotype will be performed in patients with detected SH3TC2 mutation and selection criteria for SH3TC2 mutation testing will be refined. Results of the study will specify phenotype and genotype variability of hereditary motor and sensory neuropathy.

• MeSH
• časná diagnóza MeSH
• Charcotova-Marieova-Toothova nemoc diagnóza   genetika   MeSH
• dědičné senzorické a autonomní neuropatie diagnóza   genetika   MeSH
• diagnostické techniky molekulární využití   MeSH
• fenotyp MeSH
• genetická predispozice k nemoci MeSH
• genetické poradenství MeSH
• mutace MeSH
• prenatální diagnóza MeSH
• src homologní domény MeSH

• Konspekt
• Patologie. Klinická medicína
• NLK Obory
• neurologie
• genetika, lékařská genetika
• biologie
• NLK Publikační typ
• závěrečné zprávy o řešení grantu IGA MZ ČR

OBJECTIVES: Non-syndromic hearing loss (NSHL) is a genetically heterogeneous disorder with mostly autosomal recessive inheritance. So far 40 genes and the same amount of loci with as yet unknown genes were described with autosomal recessive NSHL. PATIENTS AND METHODS: A consanguineous Czech family with a child with NSHL was genotyped using SNP array and homozygous regions were compared with previously reported DFNB loci. RESULTS: GRXCR1 and ESRRB genes associated with autosomal recessive NSHL were located in two of the eight homozygous regions detected by SNP array genotyping. Mutation p.R291L in a homozygous state was found in the deaf child, the parents were heterozygous. The entire coding region of the ESRRB gene was sequenced in additional 39 patients of Czech origin with early NSHL and only two variants, p.V413I and p.P386S, were found in homozygous state, but are considered to be polymorphisms. CONCLUSION: Homozygosity mapping is a powerful method for identification of genes in heterogeneous recessive diseases. This is the first report of DFNB35 mutations in the Czech Republic and it seems to be a rare cause of NSHL. Additional mutations in ESRRB gene were reported in Pakistan, Tunisia and Turkey.

• MeSH
• detekce genetických nosičů MeSH
• exony MeSH
• genotyp MeSH
• glutaredoxiny genetika   MeSH
• hluchota genetika   MeSH
• homozygot MeSH
• jednonukleotidový polymorfismus MeSH
• lidé MeSH
• mutace * MeSH
• pokrevní příbuzenství MeSH
• receptory pro estrogeny genetika   MeSH
• rodokmen MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Geografické názvy
• Česká republika MeSH

Charcot-Marie-Tooth (CMT) neuropathy is the most common inherited neuromuscular disorder. CMT is genetically very heterogeneous. Mutations in the SH3TC2 gene cause Charcot-Marie-Tooth neuropathy type 4C (CMT4C), a demyelinating form with autosomal recessive inheritance. In this study, two novel splice site mutations in the SH3TC2 gene have been studied (c.279G → A, c.3676-8G → A). Mutation c.279G → A was detected on one allele in two unrelated families with CMT4C in combination with a known pathogenic mutation (c.2860 C →T in one family, c.505T → C in the other) on the second allele of SH3TC2 gene. Variant c.3676-8G → A was detected in two patients from unrelated families on one allele of the SH3TC2 gene in combination with c.2860C →T mutation on the other allele. Several in silico tests were performed and exon trap experiments were undertaken in order to prove the effect of both mutations on proper splicing of SH3TC2. Fragments of SH3TC2 were subcloned into pET01 exon trap vector (Mobitec) and transfected into COS-7 cells. Aberrant splicing was predicted in silico for both mutations, which was confirmed by exon trap analysis. For c.279G → A mutation, 19 bases from intron 3 are retained in cDNA. The mutation c.3676-8G→ A produces a novel splice acceptor site for exon 17 and complex changes in splicing were observed. We present evidence that mutations c.279G → A and c.3676-8G →A in the SH3TC2 gene cause aberrant splicing and are therefore pathogenic and causal for CMT4C.

• MeSH
• Cercopithecus aethiops MeSH
• Charcotova-Marieova-Toothova nemoc genetika   patologie   patofyziologie   MeSH
• COS buňky MeSH
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mutace genetika   MeSH
• nervové vedení genetika   MeSH
• počítačová simulace * MeSH
• proteiny genetika   MeSH
• referenční hodnoty MeSH
• transfekce MeSH
• zdraví rodiny MeSH
• zvířata MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

• Publikační typ
• abstrakt z konference MeSH

• Publikační typ
• abstrakt z konference MeSH

The genome of Caenorhabditis elegans encodes more than 280 nuclear hormone receptors (NHRs) in contrast to the 48 NHRs in humans and 18 NHRs in Drosophila. The majority of the C. elegans NHRs are categorized as supplementary nuclear receptors (supnrs) that evolved by successive duplications of a single ancestral gene. The evolutionary pressures that lead to the expansion of NHRs in nematodes, as well as the function of the majority of supnrs, are not known. Here, we have studied the expression of seven genes organized in a cluster on chromosome V: nhr-206, nhr-208, nhr-207, nhr-209, nhr-154, nhr-153 and nhr-136. Reverse transcription-quantitative PCR and analyses using transgenic lines carrying GFP fusion genes with their putative promoters revealed that all seven genes of this cluster are expressed and five have partially overlapping expression patterns including in the pharynx, intestine, certain neurons, the anal sphincter muscle, and male specific cells. Four genes in this cluster are conserved between C. elegans and Caenorhabditis briggsae whereas three genes are present only in C. elegans, the apparent result of a relatively recent expansion. Interestingly, we find that a subset of the conserved and non-conserved genes in this cluster respond transcriptionally to fasting in tissue-specific patterns. Our results reveal the diversification of the temporal, spatial, and metabolic gene expression patterns coupled with evolutionary drift within supnr family members.

• MeSH
• Caenorhabditis elegans genetika   metabolismus   fyziologie   MeSH
• chromozomy MeSH
• duplicitní geny MeSH
• genetická transkripce fyziologie   MeSH
• genetická variace fyziologie   MeSH
• genom u helmintů MeSH
• hmyz genetika   metabolismus   MeSH
• lidé MeSH
• molekulární sekvence - údaje MeSH
• multigenová rodina genetika   MeSH
• omezení příjmu potravy metabolismus   fyziologie   MeSH
• receptory cytoplazmatické a nukleární genetika   metabolismus   MeSH
• savci genetika   metabolismus   MeSH
• sekvence aminokyselin MeSH
• sekvenční homologie aminokyselin MeSH
• vývojová regulace genové exprese MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• mužské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH