Cardiac involvement (CI) in phosphomannomutase 2-congenital disorders of glycosylation (PMM2-CDG) is part of the multisystemic presentation contributing to high mortality rates. The most common cardiac manifestations are pericardial effusion, cardiomyopathy, and structural heart defects. A genotype-phenotype correlation with organ involvement has not yet been described. We analyzed clinical, biochemical, and molecular genetic data of 222 patients from eight European centers and characterized the natural course of patients with CI. Fifty-seven patients (45 children) presented with CI, of whom 24 died (median age 21 months, standard deviation 49.8). Pericardial effusion was the most frequent manifestation (55.4%), occurring mostly within the first 6 months of life. The most common pathogenic variants in patients with CI were p.(Arg141His) in 74%, followed by p.(Val231Met) in 36%, which is 3.5 times higher than in PMM2-CDG patients without CI (p < 0.0001). Twenty-one out of 36 patients with p.(Val231Met) had CI; among them, 15 died, compared to 33 out of 166 patients without p.(Val231Met) who had CI (p < 0.0001). Nine out of 33 patients died (p = 0.0015), indicating greater clinical severity. Furthermore, the p.(Val231Met) variant is predominant in Eastern Europe, suggesting a founder effect. Cardiac complications in PMM2-CDG patients are common and serious. The variant p.(Val231Met) profoundly influences the extent of CI and mortality rates. Therefore, we recommend cardiac surveillance be included in the follow-up protocols for PMM2-CDG.
- MeSH
- dítě MeSH
- fenotyp * MeSH
- fosfotransferasy (fosfomutasy) * genetika nedostatek MeSH
- genetické asociační studie MeSH
- kardiomyopatie genetika MeSH
- kojenec MeSH
- lidé MeSH
- mladiství MeSH
- mutace MeSH
- novorozenec MeSH
- předškolní dítě MeSH
- stupeň závažnosti nemoci MeSH
- vrozené poruchy glykosylace * genetika MeSH
- Check Tag
- dítě MeSH
- kojenec MeSH
- lidé MeSH
- mladiství MeSH
- mužské pohlaví MeSH
- novorozenec MeSH
- předškolní dítě MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- multicentrická studie MeSH
- práce podpořená grantem MeSH
- Geografické názvy
- Evropa MeSH
BACKGROUND: Among inherited cardiomyopathies involving the left ventricle, whether dilated or not, certain genotypes carry a well-established arrhythmic risk, notably manifested as sustained monomorphic ventricular tachycardia (SMVT). Nonetheless, the precise localization and electrophysiological profile of this substrate remain undisclosed across different genotypes. METHODS: Patients diagnosed with cardiomyopathy and left ventricle involvement due to high-risk genetic variants and SMVT treated by electrophysiological study were recruited from 18 European/US centers. Electrophysiological study, imaging, and outcomes data after ablation were assessed in relation to genotype. RESULTS: Seventy-one patients were included (49.6 Q1-Q3 [40-60] years, 76% men). They were divided into 4 groups according to the affected protein: desmosomal (DSP, PKP2, DSG2, and DSC2), nuclear membrane (LMNA and TMEM43), cytoskeleton (FLNC and DES), and sarcoplasmic reticulum (PLN). Desmosomal genes, TMEM43, and PLN were associated with biventricular disease, while variants in LMNA and cytoskeleton genes had predominant left ventricle involvement (P=0.001). The location of the clinical-SMVT substrate was significantly different based on genotype (P=0.005). DSP and cytoskeleton genes presented SMVTs with right bundle branch block morphology, which origin was identified in the inferolateral segments of the left ventricle. The other desmosomal genes (PKP2 and DSG2), along with TMEM43, showed SMVTs with left bundle branch block morphology and predominantly right ventricular substrate. In contrast, LMNA substrate was mainly observed in the interventricular septum. During a median of 26 Q1-Q3 (10.6-65) months, 27% of patients experienced recurrences of clinical SMVT with differences between genotypes (log-rank 0.016). Nuclear membrane genes demonstrated the highest recurrence rate compared with desmosomal genes (hazard ratio, 4.56 [95% CI, 1.5-13.8]). CONCLUSIONS: The anatomic substrate of SMVTs shows a strong correlation with the underlying genotype, electrocardiographic morphology, and recurrence rate. Particularly, patients with nuclear membrane gene variants have a significantly higher recurrence rate compared with those with desmosomal gene variants.
- MeSH
- akční potenciály MeSH
- dospělí MeSH
- elektrofyziologické techniky kardiologické MeSH
- fenotyp * MeSH
- genetická predispozice k nemoci * MeSH
- genetické asociační studie MeSH
- genotyp MeSH
- hodnocení rizik MeSH
- kardiomyopatie genetika patofyziologie diagnóza MeSH
- katetrizační ablace MeSH
- komorová tachykardie * genetika patofyziologie diagnóza MeSH
- lidé středního věku MeSH
- lidé MeSH
- rizikové faktory MeSH
- výsledek terapie MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- multicentrická studie MeSH
- pozorovací studie MeSH
- Geografické názvy
- Evropa MeSH
Emeryho‐Dreifussova svalová dystrofie (EDMD) patří k vzácným genetickým onemocněním, kde je hlavní příčinou porucha genů kódujících jaderné membránové proteiny. Neurologické příznaky bývají méně vyjádřené a jsou i pro pacienty méně limitující. Naopak dominující jsou kardiální příznaky s poruchami tvorby a převodu vzruchu (sick sinus syndrom, AV blokády, síňové arytmie) či výskytem dilatační kardiomyopatie. Tyto projevy jsou klinicky závažnější a je nutné na ně u pacientů s EDMD myslet. V článku uvádíme soubor deseti nemocných s EDMD, kde poukazujeme na různorodost a závažnost kardiálních obtíží včetně nutnosti dlouhodobé dispenzarizace v rámci multidisciplinárního týmu.
Emery-Dreifuss muscular dystrophy (EDMD) belongs to a rare genetic diseases with disturbances of the genes encoding nuclear membrane proteins. Neurological symptoms are less pronounced and not too limiting for EDMD patients; however, dominant cardiac symptoms with conduction impairment (AV block, atrial arrhythmias) and/or cardiomyopathy are the most serious manifestations of EDMD. We present 10 patients with EDMD, pointing out the variability and severity of cardiac problems, including long-term medical care within the approach of the multidisciplinary medical team.
Arrhythmogenic cardiomyopathy is an inherited cardiomyopathy characterized by fibrofatty replacement and a high risk of ventricular arrhythmias and sudden cardiac death. This myocardial disorder is typically transmitted through autosomal dominant pattern and caused by pathogenic variants in the desmosomal and extradesmosomal genes. In this case, we are presenting a family with three members who have arrhythmogenic left ventricular cardiomyopathy. The condition was found to be caused by a nonsense mutation (c.1754 T>G (p. Leu585Ter)) in the desmoplakin (DSP) gene. Unfortunately, two of the family members were initially misdiagnosed and treated for coronary artery disease, which was not the correct diagnosis. This case demonstrates the importance of accurate differential diagnosis and the usefulness of magnetic resonance imaging (MRI) in establishing the correct diagnosis of arrhythmogenic cardiomyopathy.
- MeSH
- anamnéza MeSH
- chybná diagnóza MeSH
- desmoplakiny genetika MeSH
- genetické testování MeSH
- ischemická choroba srdeční diagnóza MeSH
- kardiologické zobrazovací techniky MeSH
- kardiomyopatie * diagnostické zobrazování genetika vrozené MeSH
- lidé MeSH
- mladý dospělý MeSH
- mutace MeSH
- srdeční komory abnormality MeSH
- vrozené srdeční vady * diagnostické zobrazování genetika patofyziologie MeSH
- Check Tag
- lidé MeSH
- mladý dospělý MeSH
- ženské pohlaví MeSH
- Publikační typ
- kazuistiky MeSH
- práce podpořená grantem MeSH
BACKGROUND: Transthyretin amyloidosis, also called ATTR amyloidosis, is associated with accumulation of ATTR amyloid deposits in the heart and commonly manifests as progressive cardiomyopathy. Patisiran, an RNA interference therapeutic agent, inhibits the production of hepatic transthyretin. METHODS: In this phase 3, double-blind, randomized trial, we assigned patients with hereditary, also known as variant, or wild-type ATTR cardiac amyloidosis, in a 1:1 ratio, to receive patisiran (0.3 mg per kilogram of body weight) or placebo once every 3 weeks for 12 months. A hierarchical procedure was used to test the primary and three secondary end points. The primary end point was the change from baseline in the distance covered on the 6-minute walk test at 12 months. The first secondary end point was the change from baseline to month 12 in the Kansas City Cardiomyopathy Questionnaire-Overall Summary (KCCQ-OS) score (with higher scores indicating better health status). The second secondary end point was a composite of death from any cause, cardiovascular events, and change from baseline in the 6-minute walk test distance over 12 months. The third secondary end point was a composite of death from any cause, hospitalizations for any cause, and urgent heart failure visits over 12 months. RESULTS: A total of 360 patients were randomly assigned to receive patisiran (181 patients) or placebo (179 patients). At month 12, the decline in the 6-minute walk distance was lower in the patisiran group than in the placebo group (Hodges-Lehmann estimate of median difference, 14.69 m; 95% confidence interval [CI], 0.69 to 28.69; P = 0.02); the KCCQ-OS score increased in the patisiran group and declined in the placebo group (least-squares mean difference, 3.7 points; 95% CI, 0.2 to 7.2; P = 0.04). Significant benefits were not observed for the second secondary end point. Infusion-related reactions, arthralgia, and muscle spasms occurred more often among patients in the patisiran group than among those in the placebo group. CONCLUSIONS: In this trial, administration of patisiran over a period of 12 months resulted in preserved functional capacity in patients with ATTR cardiac amyloidosis. (Funded by Alnylam Pharmaceuticals; APOLLO-B ClinicalTrials.gov number, NCT03997383.).
- MeSH
- amyloidóza * komplikace farmakoterapie genetika MeSH
- dvojitá slepá metoda MeSH
- familiární amyloidóza komplikace farmakoterapie genetika MeSH
- játra metabolismus MeSH
- kardiomyopatie * farmakoterapie etiologie genetika metabolismus MeSH
- lidé MeSH
- malá interferující RNA * terapeutické užití MeSH
- prealbumin * genetika metabolismus MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- klinické zkoušky, fáze III MeSH
- randomizované kontrolované studie MeSH
Desmin mutations cause familial and sporadic cardiomyopathies. In addition to perturbing the contractile apparatus, both desmin deficiency and mutated desmin negatively impact mitochondria. Impaired myocardial metabolism secondary to mitochondrial defects could conceivably exacerbate cardiac contractile dysfunction. We performed metabolic myocardial phenotyping in left ventricular cardiac muscle tissue in desmin knock-out mice. Our analyses revealed decreased mitochondrial number, ultrastructural mitochondrial defects, and impaired mitochondria-related metabolic pathways including fatty acid transport, activation, and catabolism. Glucose transporter 1 and hexokinase-1 expression and hexokinase activity were increased. While mitochondrial creatine kinase expression was reduced, fetal creatine kinase expression was increased. Proteomic analysis revealed reduced expression of proteins involved in electron transport mainly of complexes I and II, oxidative phosphorylation, citrate cycle, beta-oxidation including auxiliary pathways, amino acid catabolism, and redox reactions and oxidative stress. Thus, desmin deficiency elicits a secondary cardiac mitochondriopathy with severely impaired oxidative phosphorylation and fatty and amino acid metabolism. Increased glucose utilization and fetal creatine kinase upregulation likely portray attempts to maintain myocardial energy supply. It may be prudent to avoid medications worsening mitochondrial function and other metabolic stressors. Therapeutic interventions for mitochondriopathies might also improve the metabolic condition in desmin deficient hearts.
- MeSH
- aminokyseliny metabolismus MeSH
- citráty metabolismus MeSH
- desmin * genetika metabolismus MeSH
- glukosa metabolismus MeSH
- hexokinasa * genetika metabolismus MeSH
- kardiomyopatie * genetika metabolismus MeSH
- kreatinkinasa, mitochondriální forma metabolismus MeSH
- mastné kyseliny metabolismus MeSH
- myokard metabolismus MeSH
- myši knockoutované MeSH
- myši MeSH
- oxidativní fosforylace MeSH
- přenašeč glukosy typ 1 metabolismus MeSH
- proteomika MeSH
- zvířata MeSH
- Check Tag
- myši MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
BACKGROUND: FLNC is one of the few genes associated with all types of cardiomyopathies, but it also underlies neuromuscular phenotype. The combination of concomitant neuromuscular and cardiac involvement is not often observed in filaminopathies and the impact of this on the disease prognosis has hitherto not been analyzed. RESULTS: Here we provide a detailed clinical, genetic, and structural prediction analysis of distinct FLNC-associated phenotypes based on twelve pediatric cases. They include early-onset restrictive cardiomyopathy (RCM) in association with congenital myopathy. In all patients the initial diagnosis was established during the first year of life and in five out of twelve (41.7%) patients the first symptoms were observed at birth. RCM was present in all patients, often in combination with septal defects. No ventricular arrhythmias were noted in any of the patients presented here. Myopathy was confirmed by neurological examination, electromyography, and morphological studies. Arthrogryposes was diagnosed in six patients and remained clinically meaningful with increasing age in three of them. One patient underwent successful heart transplantation at the age of 18 years and two patients are currently included in the waiting list for heart transplantation. Two died due to congestive heart failure. One patient had ICD instally as primary prevention of SCD. In ten out of twelve patients the disease was associated with missense variants and only in two cases loss of function variants were detected. In half of the described cases, an amino acid substitution A1186V, altering the structure of IgFLNc10, was found. CONCLUSIONS: The present description of twelve cases of early-onset restrictive cardiomyopathy with congenital myopathy and FLNC mutation, underlines a distinct unique phenotype that can be suggested as a separate clinical form of filaminopathies. Amino acid substitution A1186V, which was observed in half of the cases, defines a mutational hotspot for the reported combination of myopathy and cardiomyopathy. Several independent molecular mechanisms of FLNC mutations linked to filamin structure and function can explain the broad spectrum of FLNC-associated phenotypes. Early disease presentation and unfavorable prognosis of heart failure demanding heart transplantation make awareness of this clinical form of filaminopathy of great clinical importance.
- MeSH
- fenotyp MeSH
- filaminy chemie genetika metabolismus MeSH
- kardiomyopatie * genetika metabolismus MeSH
- lidé MeSH
- nemoci svalů * MeSH
- restriktivní kardiomyopatie * genetika MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
AIMS: In arrhythmogenic cardiomyopathy (ACM), sustained ventricular tachycardia (VT) typically displays a left bundle branch block (LBBB) morphology while a right bundle branch block (RBBB) morphology is rare. The present study assesses the VT morphology in ACM patients with sustained VT and their clinical and genetic characteristics. METHODS AND RESULTS: Twenty-six centres from 11 European countries provided information on 954 ACM patients who had ≥1 episode of sustained VT spontaneously documented during patients' clinical course. Arrhythmogenic cardiomyopathy was defined according to the 2010 Task Force Criteria, and VT morphology according to the QRS pattern in V1. Overall, 882 (92.5%) patients displayed LBBB-VT alone and 72 (7.5%) RBBB-VT [alone in 42 (4.4%) or in combination with LBBB-VT in 30 (3.1%)]. Male sex prevalence was 79.3%, 88.1%, and 56.7% in the LBBB-VT, RBBB-VT, and LBBB + RBBB-VT groups, respectively (P = 0.007). First RBBB-VT occurred 5 years after the first LBBB-VT (46.5 ± 14.4 vs 41.1 ± 15.8 years, P = 0.011). An implanted cardioverter-defibrillator was more frequently implanted in the RBBB-VT (92.9%) and the LBBB + RBBB-VT groups (90%) than in the LBBB-VT group (68.1%) (P < 0.001). Mutations in PKP2 predominated in the LBBB-VT (65.2%) and the LBBB + RBBB-VT (41.7%) groups while DSP mutations predominated in the RBBB-VT group (45.5%). By multivariable analysis, female sex was associated with LBBB + RBBB-VT (P = 0.011) while DSP mutations were associated with RBBB-VT (P < 0.001). After a median follow-up of 103 (51-185) months, death occurred in 106 (11.1%) patients with no intergroup difference (P = 0.176). CONCLUSION: RBBB-VT accounts for a significant proportion of sustained VTs in ACM. Sex and type of pathogenic mutations were associated with VT type, female sex with LBBB + RBBB-VT, and DSP mutation with RBBB-VT.
- MeSH
- blokáda Tawarova raménka diagnóza epidemiologie terapie MeSH
- elektrokardiografie MeSH
- kardiomyopatie * komplikace epidemiologie genetika MeSH
- komorová tachykardie * diagnóza epidemiologie genetika MeSH
- lidé MeSH
- prevalence MeSH
- Check Tag
- lidé MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- Klíčová slova
- syndrom krátkého QT,
- MeSH
- Brugadův syndrom etiologie genetika MeSH
- chromozomální aberace klasifikace MeSH
- cytogenetika MeSH
- fibrilace komor etiologie genetika MeSH
- genetické testování * klasifikace metody MeSH
- geny MeSH
- kardiomyopatie etiologie genetika klasifikace MeSH
- karyotyp MeSH
- lidé MeSH
- mutace MeSH
- nemoci srdce * etiologie genetika klasifikace MeSH
- srdeční arytmie etiologie genetika klasifikace MeSH
- syndrom dlouhého QT etiologie genetika MeSH
- terminologie jako téma MeSH
- typy dědičnosti MeSH
- vysoce účinné nukleotidové sekvenování MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- přehledy MeSH
Cullin 4B (CUL4B), lysosomal-associated membrane protein Type 2 (LAMP2), ATP1B4, TMEM255A, and ZBTB33 are neighboring genes on Xq24. Mutations in CUL4B result in Cabezas syndrome (CS). Male CS patients present with dysmorphic, neuropsychiatric, genitourinary, and endocrine abnormalities. Heterozygous CS females are clinically asymptomatic. LAMP2 mutations cause Danon disease (DD). Cardiomyopathy is a dominant feature of DD present in both males and heterozygous females. No monogenic phenotypes have been associated with mutations in ATP1B4, TMEM255A, and ZBTB33 genes. To facilitate diagnostics and counseling in CS and DD families, we present a female DD patient with a de novo Alu-mediated Xq24 rearrangement causing a deletion encompassing CUL4B, LAMP2, and also the other three neighboring genes. Typical to females heterozygous for CUL4B mutations, the patient was CS asymptomatic, however, presented with extremely skewed X-chromosome inactivation (XCI) ratios in peripheral white blood cells. As a result of the likely selection against CUL4B deficient clones, only minimal populations (~3%) of LAMP2 deficient leukocytes were identified by flow cytometry. On the contrary, myocardial LAMP2 protein expression suggested random XCI. We demonstrate that contiguous CUL4B and LAMP2 loss-of-function copy number variations occur and speculate that male patients carrying similar defects could present with features of both CS and DD.
- MeSH
- chromozomální delece MeSH
- dospělí MeSH
- elementy Alu genetika MeSH
- exony genetika MeSH
- glykogenóza typu IIb diagnóza genetika patofyziologie MeSH
- inaktivace chromozomu X genetika MeSH
- kardiomyopatie genetika patofyziologie MeSH
- kulinové proteiny genetika MeSH
- lidé MeSH
- membránový protein 2 asociovaný s lyzozomy genetika MeSH
- mentální retardace vázaná na chromozom X genetika patofyziologie MeSH
- mutace ztráty funkce genetika MeSH
- myokard metabolismus MeSH
- sodíko-draslíková ATPasa genetika MeSH
- transkripční faktory genetika MeSH
- variabilita počtu kopií segmentů DNA genetika MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- kazuistiky MeSH
- práce podpořená grantem MeSH
