• MeSH
• dějiny MeSH
• psychologie dějiny   MeSH
• Publikační typ
• biografie MeSH
• Geografické názvy
• Spojené státy americké MeSH

• O autorovi
• Maslow, Abraham Harold, 1908-1970 Autorita

We analyzed the FRAXAC2 and DXS548 microsatellites in normal and fragile X chromosomes from Sweden and the Czech Republic in order to investigate a possible founder effect for chromosomes carrying a fragile X mutation. We report a much stronger linkage disequilibrium between the marker haplotypes and the disease in Swedish fragile X chromosomes than in Czech and most other previously studied Caucasian populations. Two haplotypes accounted for 64% of Swedish fragile X chromosomes and for only 14% of normal chromosomes. Neither of these two haplotypes was found in Czech chromosomes, but the most common Swedish fragile X haplotype is the same as that reported to be predominant in Finnish fragile X patients. Linkage disequilibrium was observed in the Czech fragile X chromosomes but the haplotypes were more diverse and similar to those observed in other Caucasian populations. The most prevalent Swedish fragile X haplotype was traced back from affected males to common ancestors in the early 18th century. This indicates an apparently silent segregation of fragile X alleles through up to nine generations. The geographical distribution of the two major at-risk haplotypes in Sweden suggests that they were present among early settlers in different parts of the country.

• MeSH
• frekvence genu MeSH
• haplotypy MeSH
• lidé MeSH
• molekulární epidemiologie MeSH
• populační genetika * MeSH
• rodokmen MeSH
• rozdělení chí kvadrát MeSH
• satelitní DNA analýza   MeSH
• syndrom fragilního X epidemiologie   genetika   MeSH
• vazebná nerovnováha MeSH
• Check Tag
• lidé MeSH
• mužské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• srovnávací studie MeSH
• Geografické názvy
• Česká republika MeSH
• Švédsko MeSH

Dual hereditary jaundice, a combination of Dubin-Johnson and Gilbert's syndromes, is a rare clinical entity resulting from the compound defects of bilirubin conjugation and transport. We aimed to study the hereditary jaundice in 56 members from seven seemingly unrelated Roma families, to find the causal genetic defect and to estimate its origin in Roma population. On the basis of biochemical results of total and conjugated serum bilirubin and clinical observations, ABCC2 gene, TATA box and phenobarbital enhancer (PBREM) of UGT1A1 gene were analyzed by sequencing, RFLP and fragment analysis. We found a novel variant c.1013_1014delTG in the eighth exon of ABCC2 gene in 17 individuals in homozygous state. Dual defect NG_011798.1:c.[1013_1014delTG]; NG_002601.2:g.[175492_175493insTA] in homozygous state was found in four subjects. Biochemical analyses of porphyrins and coproporphyrin isomers in urine performed by HPLC showed inverted ratio of excreted coproporphyrin, with the predominance of coproporphyrin I (up to 100%), typical for patients with Dubin-Johnson syndrome. Pursuant cultural and social specifics of the population led us to suspect a founder effect; therefore, we performed a haplotype study using genotyping data from Affymetrix Genome-Wide Human SNP Array 6.0. As a result, we detected a common 86 kbp haplotype encompassing promoter and part of the ABCC2 coding region among all families, and estimated the age of the ancestral variant to 178-185 years. In this study, we found a novel deletion in ABCC2 gene, described genetic and biochemical features of dual hereditary jaundice and confirmed the existence of founder effect and common haplotype among seven Roma families.

• MeSH
• bilirubin metabolismus   MeSH
• delece genu * MeSH
• efekt zakladatele * MeSH
• Gilbertova nemoc diagnóza   genetika   MeSH
• glukuronosyltransferasa genetika   MeSH
• haplotypy MeSH
• homozygot MeSH
• jednonukleotidový polymorfismus MeSH
• koproporfyriny moč   MeSH
• lidé MeSH
• polymorfismus délky restrikčních fragmentů MeSH
• proteiny spojené s mnohočetnou rezistencí k lékům genetika   MeSH
• TATA box MeSH
• žloutenka chronická idiopatická diagnóza   genetika   MeSH
• Check Tag
• lidé MeSH
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

This paper deals with some other population genetic aspects associated with the incidence of a type of primary congenital glaucoma that occurs very frequently in the Gypsy population of Slovakia. In addition to the decreased fertility of affected individuals of Gypsy origin being determined, the relative reproduction fitness and the selection coefficient against this disease were estimated. An increased number of kinship intermarriages in parents of the patients were recorded, namely in the Gypsy group (45.6%). The average inbreeding coefficient for the Gypsy group (F = 0.0091) and the non-Gypsy group (F = 0.0030) was calculated. Based on the high frequency of primary congenital glaucoma in a relatively small Gypsy subpopulation and on data about their origin, immigration, and settlements in the territory of Slovakia, the authors consider a special case of gene drift--the founder effect--to be the most plausible explanation of the given fact.

• MeSH
• etnicita * MeSH
• glaukom vrozené   genetika   MeSH
• lidé MeSH
• pokrevní příbuzenství MeSH
• populační genetika MeSH
• Romové * MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• Geografické názvy
• Československo MeSH

U ~50% rodin se syndromem dlouhého intervalu QT jsou nacházeny mutace v genech kódujících srdeční iontové kanály a související proteiny. Každá rodina má obvykle svou “vlastní” mutaci. Stejná mutace nacházená v nepříbuzných rodinách ze stejného regionu může představovat tzv. „founder mutation“. V naší databázi je stejná mutace c.926C>T; p.T309I-Kv7.1 genu KCNQ1přítomna v 5 nepříbuzných rodinách. Cílem projektu je potvrzení hypotézy, že mutace T309I-Kv7.1 představuje v našem regionu „founder mutation“. Rozšířením rodokmenů a genetickým screeningem v T309I-Kv7.1 rodinách budou identifikováni a klinicky vyšetření noví nosiči mutace. Funkční efekt mutace bude hodnocen biofyzikální analýzou u „wild type“ a mutovaného lidského IKs kanálu exprimovaného v CHO buňkách a matematickými simulacemi na lidskému modelu srdeční komorové buňky. Tato data umožní zavést genotypem a fenotypem řízená terapeutická opatření k prevenci maligních komorových arytmií a náhlé srdeční smrti i u asymptomatických nosičů mutace.; Mutations in genes encoding cardiac ionic channels and related proteins are identified in ~50% families with the long QT syndrome. Each family is usually characterized by its own mutation; the same mutation found in unrelated families living in the same region may represent the founder mutation. In our database, the same KCNQ1 mutation (c.926C>T; p.T309I-Kv7.1) was present in 5 putatively unrelated LQTS families. This project is aimed at verification of the hypothesis that T309I-Kv7.1 mutation is the founder mutation in our region. Using pedigree extension and genetic screening in T309I-Kv7.1 families, new mutation carriers will be identified and clinically investigated. The functional effect of the mutation will be revealed using biophysical analysis in wild type and mutant human IKs channels expressed in CHO cells, and mathematical simulations in a human ventricular cell model. These data will allow us to provide genotype and phenotype-guided therapeutic measures to prevent malignant arrhythmias and sudden cardiac death even in asymptomatic mutation carriers.

• MeSH
• detekce genetických nosičů MeSH
• draslíkový kanál KCNQ1 genetika   MeSH
• lidé MeSH
• metoda terčíkového zámku MeSH
• modely genetické MeSH
• modely kardiovaskulární MeSH
• mutace genetika   MeSH
• teoretické modely MeSH
• vápníkem aktivované draslíkové kanály se střední vodivostí genetika   MeSH
• Check Tag
• lidé MeSH

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

BACKGROUND: The autosomal recessive chromosomal instability disorder Nijmegen breakage syndrome (NBS) is associated with increased risk of lymphoid malignancies and other cancers. Cells from NBS patients contain many double-stranded DNA breaks. More than 90% of NBS patients are homozygous for a founder mutation, 657del5, in the NBN gene. We investigated the 657del5 carrier status of cancer patients among blood relatives (i.e., first-, through fourth-degree relatives) of NBS patients in the Czech Republic and Slovakia to test the hypothesis that NBN heterozygotes have an increased cancer risk. METHODS: Medical information was compiled from 344 blood relatives of NBS patients in 24 different NBS families from January 1, 1998, through December 31, 2003. The 657del5 carrier status of subjects was unknown at the time of their recruitment but was later determined from blood samples collected at the time of the interview. Medical records and death certificates were used to confirm a diagnosis of cancer. For the relatives with cancer who are not obligate heterozygotes (such as parents and two grandparents in consanguineous families), the observed and expected number of mutation carriers were compared by use of the index-test method, which estimated the risk of cancer associated with carrying the mutation. All P values were two-sided. RESULTS: Thirteen of the 344 blood relatives had confirmed cases of any type of cancer; 11 of these 13 cancer patients carried the NBN 657del5 mutation, compared with 6.0 expected (P = .005). Among the 56 grandparents with complete data from 14 NBS families, 10 of the 28 carriers of 657del5, but only one of the 28 noncarriers, developed cancer (odds ratio = 10.7, 95% CI = 1.4 to 81.5; P<.004). CONCLUSIONS: The NBN 657del5 mutation appears to be associated with an elevated risk of cancer in heterozygotes.

• MeSH
• delece genu MeSH
• detekce genetických nosičů MeSH
• dospělí MeSH
• efekt zakladatele MeSH
• financování organizované MeSH
• genetická predispozice k nemoci MeSH
• heterozygot MeSH
• kolorektální nádory epidemiologie   genetika   MeSH
• lidé středního věku MeSH
• lidé MeSH
• mutační analýza DNA MeSH
• nádory prsu epidemiologie   genetika   MeSH
• nádory ženských pohlavních orgánů epidemiologie   genetika   MeSH
• odds ratio MeSH
• proteiny buněčného cyklu genetika   MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• zárodečné mutace MeSH
• zlomy chromozomů MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Geografické názvy
• Česká republika MeSH

Edward Babák jako docent a mimořádný profesor na pražském Fyziologickém ústavu Karlovy univerzity položil svým vědeckým dílem z doby před 1. světovou válkou základy experimentální vývojové fyziologie. Významně tím ovlivnil také biologii, psychologii, pedagogiku i pediatrii. Evoluční směr je pro českou fyziologii příznačný dosud. Po válce vložil Babák své síly do organizace vysokého školství v Brně. Zakládal zde Vysokou školu zvěrolékařskou a Lékařskou fakultu Masarykovy univerzity. Na obou školách vybudoval ústavy biologické a fyziologické a zastával nejvyšší akademické funkce. Zemřel náhle ve věku 53 let.

Edward Babák, associate professor and extraordinary professor in the Praguebased Institute of Physiology of Charles University, laid the foundations of experimental developmental physiology by his scientific contributions from the era preceding the First World War. It is worth noting that in this manner he managed to influence biology, psychology, pedagogy and psychiatry as well. His evolutionary orientation has thus far been characteristic of Czech physiology. After the war he invested his energies into the organisation of higher learning in Brno. Here he founded the College of Veterinary Medicine and the Faculty of Medicine of Masaryk University. At both schools he built institutes of biology and physiology, and established their highest academic functions. He died suddenly at the age of 53.

• MeSH
• biologie * MeSH
• dítě MeSH
• fyziologie * MeSH
• pediatrie MeSH
• psychologie * MeSH
• Check Tag
• dítě MeSH
• Publikační typ
• biografie MeSH

• O autorovi
• Babák, Edward, 1873-1926 Autorita

• Publikační typ
• abstrakt z konference MeSH

Establishing translocated populations is a common process to preserve and maintain genetic diversity of threatened species. In 2001, three translocated populations of noble crayfish (Astacus astacus) were established in the Czech Republic, founded by either adult or juvenile individuals from three particular source populations. We assessed genetic diversity at seven microsatellite loci after one decade (assumed three generations) from establishment. Although the translocated populations exhibited a slight but non-significant reduction in genetic diversity (A R = 2.2-5.0; H O = 0.11-0.31), the most striking result was generally very low genetic diversity in source populations (A R = 3.0-5.3; H O = 0.15-0.38). Similarly, a high degree of inbreeding (F IS = 0.36-0.60) demonstrates the nature of source populations, already affected by isolation and small size. In spite of that, based on the results of this study, the establishment of new translocated noble crayfish populations was successful, since there is no significant decline in genetic variability and all populations are still viable. Although source populations did not exhibit high genetic diversity, their distinctiveness makes them possible to use for conservation purposes. Continued monitoring is necessary to track the long-term progress of the translocation program, including other parameters describing the state of the population, such as the occurrence and frequency of diseases or morphological changes.

• MeSH
• alely MeSH
• efekt zakladatele * MeSH
• genetická variace * MeSH
• hustota populace MeSH
• inbreeding MeSH
• mikrosatelitní repetice MeSH
• populační genetika * MeSH
• sekvenční analýza DNA MeSH
• severní raci genetika   MeSH
• zachování přírodních zdrojů MeSH
• zvířata MeSH
• Check Tag
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Geografické názvy
• Česká republika MeSH

STUDY OBJECTIVES: This study describes high-throughput phenotyping strategies for sleep and circadian behavior in mice, including examinations of robustness, reliability, and heritability among Diversity Outbred (DO) mice and their eight founder strains. METHODS: We performed high-throughput sleep and circadian phenotyping in male mice from the DO population (n = 338) and their eight founder strains: A/J (n = 6), C57BL/6J (n = 14), 129S1/SvlmJ (n = 6), NOD/LtJ (n = 6), NZO/H1LtJ (n = 6), CAST/EiJ (n = 8), PWK/PhJ (n = 8), and WSB/EiJ (n = 6). Using infrared beam break systems, we defined sleep as at least 40 s of continuous inactivity and quantified sleep-wake amounts and bout characteristics. We developed assays to measure sleep latency in a new environment and during a modified Murine Multiple Sleep Latency Test, and estimated circadian period from wheel-running experiments. For each trait, broad-sense heritability (proportion of variability explained by all genetic factors) was derived in founder strains, while narrow-sense heritability (proportion of variability explained by additive genetic effects) was calculated in DO mice. RESULTS: Phenotypes were robust to different inactivity durations to define sleep. Differences across founder strains and moderate/high broad-sense heritability were observed for most traits. There was large phenotypic variability among DO mice, and phenotypes were reliable, although estimates of heritability were lower than in founder mice. This likely reflects important nonadditive genetic effects. CONCLUSIONS: A high-throughput phenotyping strategy in mice, based primarily on monitoring of activity patterns, provides reliable and heritable estimates of sleep and circadian traits. This approach is suitable for discovery analyses in DO mice, where genetic factors explain some proportion of phenotypic variation.

• MeSH
• collaborative cross u myší * MeSH
• fenotyp MeSH
• inbrední kmeny myší MeSH
• myši inbrední C57BL MeSH
• myši inbrední NOD MeSH
• myši MeSH
• reprodukovatelnost výsledků MeSH
• spánek * genetika   MeSH
• zvířata MeSH
• Check Tag
• mužské pohlaví MeSH
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• Research Support, N.I.H., Extramural MeSH