penetrance

..We suggest that incomplete penetrance of dominant mutations in the LMNA gene is a common feature and we emphasize the significance of mutational ..

..Our results demonstrate that mutations in developmental networks can expose otherwise buffered stochastic variability in gene expression, leading to pronounced phenotypic variation...

..LHON) is due primarily to one of three common point mutations of mitochondrial DNA (mtDNA), but the incomplete penetrance implicates additional genetic or environmental factors in the pathophysiology of the disorder...

..with inherited cardiac conduction defects and Brugada syndrome, which both exhibit variable phenotypic penetrance of conduction defects...

..Risk prediction provided by the counselor requires reliable estimates of the mutation penetrance. Such penetrance has been investigated by studies worldwide. The reported estimates vary...

..This model also defines the variability in HD onset that is not attributable to CAG length and provides information concerning CAG-related penetrance rates.

..was to test a hypothesis that M34T and V37I are pathogenic but have distinct features resulting in a reduced penetrance. We screened for known GJB2/GJB6 mutations 233 Polish consecutive unrelated subjects with non-syndromic, ..

..Evaluations of these null mice have uncovered phenotypic features with age-dependent penetrance and variable expressivity, partially recapitulating the human BBS phenotype.

The penetrance of Leber's hereditary optic neuropathy (LHON) in families with primary mitochondrial DNA (mtDNA) mutations is very complex...

..Environmental factors are thought to precipitate the visual failure and explain the marked incomplete penetrance of LHON, but previous small studies have failed to confirm this to be the case...

..that functional TGFbeta1 SNPs increase TGFbeta/BMP signaling imbalance in BMPR2 mutation heterozygotes to accelerate the age at diagnosis, increase the penetrance and SMAD2 expression in familial pulmonary arterial hypertension.

..None of the performed analyses showed statistically significant results. In conclusion, our data suggested lack of association between SNPs rs2910164, rs11614913 and rs3746444 and breast cancer risk, or age at breast cancer onset...

..The rest of the susceptibility could be explained by a number of low-penetrance variants following a polygenic model of inheritance...

..We therefore explored the role of two key parameters that influence ascertainment, penetrance and family size, in rates of observed familiality.

..The penetrance of hearing loss in these pedigrees ranged from 3% to 29%, with an average of 13...

..in 15 Russian LHON patients and found the new mtDNA sequence variant in one family (2 patients) who showed 100% penetrance of the disease in men...

We have performed an entire-population-based survey of the epidemiology and penetrance of Leber hereditary optic neuropathy (LHON) in Finland - a country that is among the best-studied genetic isolates in the world...

..The twist -null mutant mouse model, combined with other mutant mouse strains, might also help in an understanding of the etiology of morphological abnormalities that appear in human patients affected by other syndromes...

....

..To characterize the clinical phenotype, histopathological features, and molecular genetic basis of an Avellino corneal dystrophy (ACD) in a Chinese family...

..and genetic characterization of a Chinese Leber's hereditary optic neuropathy (LHON) family with complete penetrance and high percentage of recovery...

..To identify additional low-penetrance genes, we have done a two-stage case-control study in two European populations using high-throughput genotyping...

..in the cathepsin G locus and that a knock-in model might yield much higher expression levels and higher penetrance of disease...

..Here, we show that placing the mutation onto different genetic backgrounds has a major effect on the penetrance and severity of the craniofacial and other defects...

The penetrance in Leber's hereditary optic neuropathy (LHON) pedigrees is determined primarily by a mutation in the mitochondrial genome (mtDNA), but secondary factors are also necessary for manifestation of the disorder...

..This study addresses whether different exon mutations have variable expressivity especially in relation to the age of onset of breast cancer...

..Considerable phenotypic variation has been noted however, including two anecdotal cases of apparent non penetrance at birth...

..findings and the spectrum of mevalonate kinase (MVK) gene mutations as well as an associated TNFRSF1A low-penetrance variant in a series of patients with clinical features of the hyperimmunoglobulinemia D with periodic fever ..

..Further genotyping and many more samples will be required, and indeed the discovery of many more risk loci associated with CRC before the question of the potential utility of germline genomic profiling can be definitively answered...

..Presentation, age-dependent penetrance, and stage at presentation of medullary thyroid carcinoma (MTC), pheochromocytoma, and hyperparathyroidism were ..

..In the present study, we tested the association between common variants in candidate genes and hemochromatosis penetrance, in a large sample of C282Y homozygotes, using pretherapeutic serum ferritin level as marker of hemochromatosis ..

..RESULTS: Penetrance for the founder mutations by ages 40, 50, and 70 are approximately 7%, 20%, and 40%, respectively...

..splicing factor PRPF31 cause retinitis pigmentosa, a form of hereditary retinal degeneration, with reduced penetrance. We and others have previously shown that penetrance is tightly correlated with PRPF31 expression, as ..

..COL6A1 premature termination mutations exhibit variable penetrance necessitating a cautious approach to genetic counselling.

..The authors detected a high rate of somatic mosaicism in male and female patients with variable penetrance of bilateral SBH including nonpenetrance in a heterozygous woman...

Genomewide association studies have identified 10 low-penetrance loci that confer modestly increased risk for colorectal cancer (CRC)...

..for paragangliomas, and current estimates of the chance of mutation carriers actually developing tumors (penetrance) are high...

..FAP is inherited as an autosomal dominant trait with variable penetrance. CASES: Two pairs of DNA confirmed monozygotic twin brothers, 63 and 37 years of age respectively, who are ..

..Mutation screening was performed using direct sequencing. Age-adjusted penetrance of aHUS was calculated for each gene in index cases and in mutation-positive relatives...

....

..Two major susceptibility alleles, BRCA1 and BRCA2, have been identified, and the prevalence and penetrance of mutations in these genes have been studied extensively...

..Based on these findings, Latourelle and colleagues show that the penetrance of the most common LRRK2 mutation is higher in patients with familial compared with sporadic Parkinson's disease ..

..016 for haplogroup H and P = 0.0003 for haplogroup U), Thus, these two haplogroups might act synergistically to increase the penetrance of AD disease.

..Observed pathogenic expansions ranged from 43-63 glutamine (Gln) codons (Gln43-63). Reduced penetrance is known for Gln43-48 alleles...

..To investigate the role of mitochondrial haplotypes in the development of Leber's hereditary optic neuropathy (LHON) associated with the ND4 G11778A mutation in Chinese families...

..To study phenotype-genotype correlation in patients who have retinoma, which is a benign tumor resembling the post irradiation regression pattern of retinoblastoma (RB)...

..Taken together, these results demonstrate that MC4-R mutations are a frequent but heterogeneous genetic cause of morbid obesity...

..However, due to reduced mutation penetrance, the disease may present in a recessive or sporadic manner.

..D92Y founder mutation. By using the Kaplan-Meier method, age-specific penetrance was calculated separately for paraganglioma formation as defined by magnetic resonance imaging (MRI) and for ..

..These estimates appear to be consistent with the observed prevalence of the mutations in the Ashkenazi Jewish population...

..The molecular scanning of RB1 in search of germ line mutations lead to the publication of more than 900 mutations whose knowledge is important for genetic counselling and the characterization of phenotypic-genotypic relationships...

....

..However, there is uncertainty regarding the degree of penetrance of this condition, and the putative impact of the environment on the development of obesity in MC4R mutation ..

..New developments in the search for susceptibility alleles in complex disorders provide support for the possibility of a polygenic approach to the prevention and treatment of common diseases...

..The differential parent-of-origin penetrance is proposed to reflect a maternal effect mediated by the production of anti-IgA antibodies tentatively linked to ..

..Understanding why some individuals, particularly women, are 'partially protected' from the effects of this and other pathogenic mutations is of utmost importance...

..Relatives carrying the same mutation had no manifestations of CNC or PPNAD, suggesting a low penetrance of this PRKAR1A defect. A founder effect was excluded by extensive genotyping of chromosome 17 markers...

..is a function of the genotypes of pedigree members given their phenotypes and provides unbiased estimates of penetrance without modeling the selection process, provided that selection is independent of genotypes...

..that two mutations in one gene are not sufficient and that three mutations between two genes are required for penetrance in some cases of Bardet-Biedl syndrome (the so-called "triallelic inheritance" model)...

..To describe the clinical phenotype and genetic basis of a family with autosomal dominant progressive external ophthalmoplegia and parkinsonism from a Twinkle mutation...

..A focused study of genetic marker data and candidate gene mutation analysis in this family is presented...

..16% in BRIC). Some mutations, however, lead to a wide range of phenotypes, from PFIC to BRIC or even no clinical disease. ATP8B1 mutations were detected in 30% and 41%, respectively, of the PFIC and BRIC patients screened...

..89 lod score. This region overlaps and reduces the SCA13 locus. However, this ADCA is clinically distinguishable from SCA13...

..If genetic studies are performed, the incomplete penetrance and variable expressivity of type 1 VWD must be taken into account...

..The authors aimed to determine what proportion of ADPEAF families carries a mutation, to estimate the penetrance of identified mutations, and to identify clinical features that distinguish families with and without mutations.

..The mode of inheritance is autosomal dominant with reduced penetrance upon maternal transmission, suggesting a putative maternal imprinting mechanism...

..Type 1 lissencephaly is mostly associated with a heterozygous deletion of the entire LIS1 gene, whereas intragenic heterozygous LIS1 mutations or hemizygous DCX mutations in males are less common...

....

..To evaluate the frequency of leucine-rich repeat kinase gene (LRRK2) mutations and single nucleotide polymorphisms (SNPs) in early-onset Parkinson disease (EOPD) and late-onset Parkinson disease (LOPD)...

..He presented with slowly progressive sensorimotor polyneuropathy accompanied by autonomic dysfunction and cardiomyopathy by echocardiography. This mutation is likely to be associated with late onset and low-penetrance phenotype.

..Typically, PAP patients do not display a strong family history of pituitary adenoma; thus, AIP is an example of a low-penetrance tumor susceptibility gene.

..Newborn genetic screening and carrier identification were also performed in the family. The role of consanguinity and the risk of autosomal recessive disease were discussed and genetic counseling was given...

..Strikingly, these Chinese pedigrees exhibited extremely low penetrance of hearing loss, ranging from 4% to 18%, with an average of 8%...

..Our results suggest a dominant negative effect of the p.Arg84Gly mutation in the VWS of both patients. Non-penetrance of this mutation is suggested in the mother of the patients.

..The presence of a skewed X inactivation in the mother provides a possible explanation for the absence of penetrance. The finding of a MECP2 mutation in an unaffected female complicates genetic counseling and further confirms ..

..The aim of this study was to evaluate the potential utility of genetic diagnosis in clinical management of families with hypertrophic cardiomyopathy (HCM) caused by mutations in the gene for cardiac troponin I (TNNI3)...

..9-Mb segment on chromosome 1p32-33 under an autosomal dominant model with reduced penetrance (peak LOD score 3.5 at D1S2652 in the largest kindred)...

..The incomplete penetrance and phenotypic variability implicate the involvement of nuclear modifier gene(s), environmental factor(s) or ..

..Hereditary diffuse gastric cancer is caused by germline mutations in the epithelial cadherin (CDH1) gene and is characterized by an increased risk for diffuse gastric cancer and lobular breast cancer...

..Here, we present a genetic study of a large and unique kindred in which MS appears to follow an autosomal-dominant pattern of inheritance, with consistent penetrance in four generations.

..cardiomyopathy) caused by mutations in the cardiac MyBP-C (myosin-binding protein C) gene show late onset, low penetrance and favourable clinical course...

..The mode of inheritance appears to be autosomal dominant with reduced penetrance. There were 10 consanguineous marriages observed in this pedigree...

..This genetic discovery has significant clinical implications because high-risk individuals and families can be closely monitored and can benefit from preventative surgical repairs...

..direct analysis and one by inferred haplotype) were identified, but only two of them were affected by dystonia (penetrance reduced to 29%)...

A subset of families with autosomal dominant retinitis pigmentosa (RP) display reduced penetrance with some asymptomatic gene carriers showing no retinal abnormalities by ophthalmic examination or by electroretinography...

..mutation carriers (aged between 37 to 66) did not have any evidence of BHD features, suggesting either reduced penetrance or late age of onset of the disease...

Assessment of the penetrance of disease-causing mutations is extremely important for developing clinical applications of gene discovery, such as genetic testing and counseling...

..Almost all adult carriers of this mutation had multiple lipomas while penetrance for retinoblastoma was incomplete...

..report a genetic linkage scan of family X with an autosomal dominant pancreatic cancer with early onset and high penetrance. For the study of this family, we have developed an endoscopic surveillance program that allows the early ..

..We conclude that mutation of the LMM can cause HCM and that such mutations may act through novel mechanisms of disease pathogenesis involving myosin filament assembly or interaction with thick filament binding proteins...

..AHO is caused by heterozygous inactivating mutations in the GNAS1 gene that result in decreased expression or function of the alpha subunit of the stimulatory G protein (Gsalpha) of adenylyl cyclase...

..exons of the cyclin-dependent kinase inhibitor gene CDKN2A are melanoma-predisposition alleles which have high penetrance, although they have low population frequencies...

..epigenetic process can explain how genetically equivalent stem cells differentiate into diverse cell types, how penetrance of disease is modulated by nutrition and environment, and how organogenesis, tissue formation, and aging occur...

..epigenetic process can explain how genetically equivalent stem cells differentiate into diverse cell types, how penetrance of disease is modulated by nutrition and environment, and how organogenesis, tissue formation, and aging occur...

..a large family with Brugada syndrome characterized by progressive conduction disease, age- and sex-dependent penetrance, and minimal response to the Na+ channel blocker procainamide...

..a large family with Brugada syndrome characterized by progressive conduction disease, age- and sex-dependent penetrance, and minimal response to the Na+ channel blocker procainamide...

..We postulate that this unique combination of ancestral and environmental factors results in a more consistent penetrance of diabetes risk alleles, as well as enrichment of risk alleles of African origin...

..We found 30 genes whose expression on all muscles causes high-penetrance axonal mistargeting phenotypes but does not perturb muscle structure...

..We postulate that this unique combination of ancestral and environmental factors results in a more consistent penetrance of diabetes risk alleles, as well as enrichment of risk alleles of African origin...

..We postulate that this unique combination of ancestral and environmental factors results in a more consistent penetrance of diabetes risk alleles, as well as enrichment of risk alleles of African origin...

..During our last funding period we investigated the frequency, heritability, penetrance, and expressivity of mutations in TERC and in the telomerase catalytic subunit TERT in patients diagnosed with ..

..A recently described low-penetrance germline mutation in codon I1307K of the APC gene that appears to increase colorectal cancer risk among ..

..the present funding cycle (09/01/01 to 08/31/06) we, GenoMEL, characterized the major effects of the known high penetrance melanoma susceptibility genes (cyclin dependent kinase [CDK] inhibitor 2A [CDKN2A] and CDK4) and increased ..

..the present funding cycle (09/01/01 to 08/31/06) we, GenoMEL, characterized the major effects of the known high penetrance melanoma susceptibility genes (cyclin dependent kinase [CDK] inhibitor 2A [CDKN2A] and CDK4) and increased ..

..the present funding cycle (09/01/01 to 08/31/06) we, GenoMEL, characterized the major effects of the known high penetrance melanoma susceptibility genes (cyclin dependent kinase [CDK] inhibitor 2A [CDKN2A] and CDK4) and increased ..

..Mitochondrial 12S rRNA A1555G mutation has been found in many families of various ethnic origins with variable penetrance and expressivity of aminoglycoside-induced and non-syndromic hearing loss...

..Mitochondrial 12S rRNA A1555G mutation has been found in many families of various ethnic origins with variable penetrance and expressivity of aminoglycoside-induced and non-syndromic hearing loss...

..Rarely, dystonia may be the only phenotypic manifestation of the disease in an affected family member. Penetrance is incomplete and expressivity is variable both within and among families...

..epithelium at the tear film interface are also hypothesized to be a barrier to pathogen and large molecule penetrance. Building on the characterizations of membrane associated mucins of the ocular surface and on the systems ..

..Mice that express oncogenic K-ras develop lung adenocarcinomas with high penetrance, but the long latency periods and low metastatic potential of these tumors imply that K-ras mutations are only ..

..epithelium at the tear film interface are also hypothesized to be a barrier to pathogen and large molecule penetrance. Building on the characterizations of membrane associated mucins of the ocular surface and on the systems ..

..Mice that express oncogenic K-ras develop lung adenocarcinomas with high penetrance, but the long latency periods and low metastatic potential of these tumors imply that K-ras mutations are only ..

..Syndrome (BrS) which are autosomal dominant diseases, these more common arrhythmias also display variable penetrance. There are several prevailing hypotheses that have attempted to explain why a particular gene expression pattern ..

..b>Penetrance is age-dependent and it is estimated that only about half of all C282Y homozygotes will express clinical disease...

..We found 30 genes whose expression on all muscles causes high-penetrance axonal mistargeting phenotypes but does not perturb muscle structure...

..Juvenile hemochromatosis (JH) is the most severe form of HH. It is an autosomal recessive disease with high penetrance that affects young patients of both sexes and leads to severe clinical complications typically in the teens and ..

..Juvenile hemochromatosis (JH) is the most severe form of HH. It is an autosomal recessive disease with high penetrance that affects young patients of both sexes and leads to severe clinical complications typically in the teens and ..

..but autosomal recessive, dominant and X-linked inheritance patterns have been described, often with reduced penetrance. Mutations in few genes have been identified, including transcription factors PAX6, CHX10, RX, SOX2 and OTX2, ..

..for several candidate susceptibility genes in the etiology of NHL, supporting a polygenic model based on low-penetrance alleles in line with the common-variant, common- disease hypothesis...

..for several candidate susceptibility genes in the etiology of NHL, supporting a polygenic model based on low-penetrance alleles in line with the common-variant, common- disease hypothesis...

..for several candidate susceptibility genes in the etiology of NHL, supporting a polygenic model based on low-penetrance alleles in line with the common-variant, common- disease hypothesis...

..virus inside its central nervous system (CNS) sanctuary is affected by variable antiretroviral therapy (ART) penetrance across the blood-brain barrier (BBB), complex dosing regimens, costs, toxicities, and limitations in ..

..virus inside its central nervous system (CNS) sanctuary is affected by variable antiretroviral therapy (ART) penetrance across the blood-brain barrier (BBB), complex dosing regimens, costs, toxicities, and limitations in ..

..of 72 families, FPPH has been shown to be inherited as an autosomal dominant disorder, with incomplete penetrance and genetic anticipation...

ATM (ataxia telangiectasia mutated) heterozygosity seems to be a risk factor for cancer. Even though the penetrance seems to be low, because of the high prevalence of 1-5% in the human population, the population risk is higher than for ..

..The phenotype is also strain dependent, occurring only in a C57BL/6 genetic background, but with complete penetrance in that strain...