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| Cardiomyopathy_Paediatric v0.102 | RNF220 |
Zornitza Stark gene: RNF220 was added gene: RNF220 was added to Cardiomyopathy_Paediatric. Sources: Literature founder tags were added to gene: RNF220. Mode of inheritance for gene: RNF220 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: RNF220 were set to 33964137; 10881263 Phenotypes for gene: RNF220 were set to Leukodystrophy; CNS hypomyelination; Ataxia; Intellectual disability; Sensorineural hearing impairment; Elevated hepatic transaminases; Hepatic fibrosis; Dilated cardiomyopathy; Spastic paraplegia; Dysarthria; Abnormality of the corpus callosum Review for gene: RNF220 was set to GREEN Added comment: Sferra et al (2021 - PMID: 33964137) provide extensive evidence that biallelic RNF220 mutations cause a disorder characterized by hypomyelinating leukodystrophy, ataxia (9/9 - onset 1-5y), borderline intellectual functioning (3/9) / intellectual disability (5/9 - in most cases mild), sensorineural deafness (9/9) with complete hearing loss in the first decade of life, hepatopathy (9/9) with associated periportal fibrosis, and dilated cardiomyopathy (9/9) which was fatal. Other neurologic manifestations apart from ataxia incl. hyperreflexia (8/8), spastic paraplegia (9/9), dysarthria (9/9), peripheral neuropathy (4/9), seizures in one case (1/9). Upon brain MRI there was thin corpus callosum (9/9) or cerebellar atrophy in some (2/9). The authors identified homozygosity for 2 recurrent missense RNF220 variants in affected members belonging to these 5 broad consanguineous pedigrees (7 families), namely NM_018150.4:c.1094G>A / p.Arg365Gly in 4 Roma families in the context of a shared haplotype (/founder effect) as well as c.1088G>A / p.Arg363Gly in a large pedigree from southern Italy initially reported by Leuzzi et al (2000 - PMID: 10881263). Extensive segregation analyses were carried out including several affected and unaffected members. RNF220 encodes ring finger protein 220, which functions as an E3 ubiquitin ligase. Previous studies have shown among others a role in modulation of Sonic hedgehog/GLI signaling and cerebellar development Evidence for the role of RNF220 included relevant expression, localization within the cell, interaction partners (lamin B1, 20S proteasome), similarities with other laminopathies in terms of phenotype, etc : *RNF220 has a relevant expression pattern in CNS (based on qRT-PCR analyses in human brain, cerebellum, cerebral cortex / mRNA levels in human fetal CNS with higher expression in cerebellum, spinal cord and cortex / previous GTEx data / protein levels in mouse CNS) *The protein displays nuclear localization based on iPSC cells differentiated to motor neurons (also supported by data from the Human Protein Atlas). Transfection of COS-1 cells demonstrated localization primarily to the nucleus (as also previously demonstrated in HEK293T cells) in vesicle like structures with ASF2/SF2 colocalization suggesting enrichment in nuclear speckles. There was also partial co-distribution with the 20S proteasome. R363Q and R365Q additionally coalesced in the cytoplasm forming protein aggregates/inclusions. *Immunofluorescence studies in patient fibroblasts also confirmed abnormal increase of the protein in the cytoplasm and increased fluorescence with the 20S proteasome. *Proteomic identification of RNF220-interacting proteins in transfected HEK293T cells demonstrated enrichment for all members of the lamin protein family (incl . lamin B1, AC, B2). *RNAi-mediated downregulation of RNF222 in Drosophila suggested altered subcellular localization and accumulation of the fly orthologue for human lamin B1. *Immunoprecipitation of lamin B1 from the nuclear matrix of cerebellar cells suggested significant interaction of endogenous lamin B1 with RNF220, while transfection studies in HEK293T cells for wt/mt suggested reduced binding to endogenous lamin B1 for RNF220 mt compared to wt (more prominent for R365Q). RNF220 mutants also reduced ubiquitination of nuclear lamin B1 compared to wt. *Patient fibroblasts immunostained with different nuclear envelope markers displayed abnormal nuclear shapes with multiple invaginations and lobulations, findings also observed in laminopathies. Sources: Literature |
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| Cardiomyopathy_Paediatric v0.65 | ELAC2 |
John Christodoulou gene: ELAC2 was added gene: ELAC2 was added to Cardiomyopathy_Paediatric. Sources: Literature Mode of inheritance for gene: ELAC2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: ELAC2 were set to PMID: 23849775: PMID: 28441660 Phenotypes for gene: ELAC2 were set to cardiomyopathy; hypotonia; growth failure; dev delay; microcephaly; sensorineural deafness; brain MRI abnormalities Penetrance for gene: ELAC2 were set to Complete Review for gene: ELAC2 was set to GREEN Added comment: 5 cases from 3 unrelated families described in the first paper cited above see OMIM 615440 Sources: Literature |
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| Cardiomyopathy_Paediatric v0.65 | PMM2 |
John Christodoulou gene: PMM2 was added gene: PMM2 was added to Cardiomyopathy_Paediatric. Sources: Literature Mode of inheritance for gene: PMM2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PMM2 were set to PMID: 28954837: PMID: 33388235 Phenotypes for gene: PMM2 were set to hypotonia; intellectual disability; cerebellar signs; pericarditis; cardiomyopathy; cardiac malformation; chronic diarrhoea; protein-losing enteropathy; ascites; cover failure; nephrotic syndrome; hydros Penetrance for gene: PMM2 were set to Complete Review for gene: PMM2 was set to RED Added comment: OMIM 212065 The two papers cited above are both review papers - the first describes a cohort of 96 patients - 9 had cardiomyopathy Sources: Literature |
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| Cardiomyopathy_Paediatric v0.17 | SHMT2 |
Zornitza Stark gene: SHMT2 was added gene: SHMT2 was added to Cardiomyopathy_Paediatric. Sources: Literature Mode of inheritance for gene: SHMT2 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: SHMT2 were set to 33015733 Phenotypes for gene: SHMT2 were set to Congenital microcephaly; Infantile axial hypotonia; Spastic paraparesis; Global developmental delay; Intellectual disability; Abnormality of the corpus callosum; Abnormal cortical gyration; Hypertrophic cardiomyopathy; Abnormality of the face; Proximal placement of thumb; 2-3 toe syndactyly Review for gene: SHMT2 was set to GREEN Added comment: García‑Cazorla et al. (2020 - PMID: 33015733) report 5 individuals (from 4 families) with a novel brain and heart developmental syndrome caused by biallelic SHMT2 pathogenic variants. All affected subjects presented similar phenotype incl. microcephaly at birth (5/5 with OFC < -2 SD though in 2/5 cases N OFC was observed later), DD and ID (1/5 mild-moderate, 1/5 moderate, 3/5 severe), motor dysfunction in the form of spastic (5/5) paraparesis, ataxia/dysmetria (3/4), intention tremor (in 3/?) and/or peripheral neuropathy (2 sibs). They exhibited corpus callosum hypoplasia (5/5) and perisylvian microgyria-like pattern (4/5). Cardiac problems were reported in all, with hypertrophic cardiomyopathy in 4/5 (from 3 families) and atrial-SD in the 5th individual (1/5). Common dysmorphic features incl. long palpebral/fissures, eversion of lateral third of lower eylids, arched eyebrows, long eyelashes, thin upper lip, short Vth finger, fetal pads, mild 2-3 toe syndactyly, proximally placed thumbs. Biallelic variants were identified following exome sequencing in all (other investigations not mentioned). Identified variants were in all cases missense SNVs or in-frame del, which together with evidence from population databases and mouse model might suggest a hypomorphic effect of variants and intolerance/embryonic lethality for homozygous LoF ones. SHMT2 encodes the mitohondrial form of serine hydroxymethyltransferase. The enzyme transfers one-carbon units from serine to tetrahydrofolate (THF) and generates glycine and 5,10,methylene-THF. Mitochondrial defect was suggested by presence of ragged red fibers in myocardial biopsy of one patient. Quadriceps and myocardial biopsies of the same individual were overall suggestive of myopathic changes. While plasma metabolites were within N range and SHMT2 protein levels not significantly altered in patient fibroblasts, the authors provide evidence for impaired enzymatic function eg. presence of the SHMT2 substrate (THF) in patient but not control (mitochondria-enriched) fibroblasts , decrease in glycine/serine ratios, impared folate metabolism. Patient fibroblasts displayed impaired oxidative capacity (reduced ATP levels in a medium without glucose, diminished oxygen consumption rates). Mitochondrial membrane potential and ROS levels were also suggestive of redox malfunction. Shmt2 ko in mice was previously shown to be embryonically lethal attributed to severe mitochondrial respiration defects, although there was no observed brain metabolic defect. The authors performed Shmt2 knockdown in motoneurons in Drosophila, demonstrating neuromuscular junction (# of satellite boutons) and motility defects (climbing distance/velocity). Sources: Literature |
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| Cardiomyopathy_Paediatric v0.0 | PCCB |
Zornitza Stark gene: PCCB was added gene: PCCB was added to Cardiomyopathy_Paediatric. Sources: NHS GMS,South West GLH,MetBioNet,Expert Review Green Mode of inheritance for gene: PCCB was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PCCB were set to 27604308 Phenotypes for gene: PCCB were set to as PCCA (metabolic encephalopathy with hyperammonaemia, hypotonia, recurrent episodes of ketoacidosis, liver impairment, psychomotor retardation, recurrent infections); Propionic acidemia; Propionicacidemia 606054; Propionic aciduria; Dehydration, hepatomegaly, lethargy, coma, acidosis, high anion gap; DCM; Propionic aciduria (Organic acidurias); Hypertrophic-hypocontractile cardiomyopathy; Propionicacidemia |
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| Cardiomyopathy_Paediatric v0.0 | PCCA |
Zornitza Stark gene: PCCA was added gene: PCCA was added to Cardiomyopathy_Paediatric. Sources: NHS GMS,South West GLH,MetBioNet,Expert Review Green Mode of inheritance for gene: PCCA was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PCCA were set to 27604308 Phenotypes for gene: PCCA were set to metabolic encephalopathy with hyperammonaemia, hypotonia, recurrent episodes of ketoacidosis, liver impairment, psychomotor retardation, recurrent infections; Propionic acidemia; Propionicacidemia 606054; Propionic aciduria; Dehydration, hepatomegaly, lethargy, coma, acidosis, high anion gap; DCM; Propionic aciduria (Organic acidurias); Hypertrophic-hypocontractile cardiomyopathy; Propionicacidemia |
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| Cardiomyopathy_Paediatric v0.0 | MUT |
Zornitza Stark gene: MUT was added gene: MUT was added to Cardiomyopathy_Paediatric. Sources: NHS GMS,South West GLH,MetBioNet,Expert Review Green Mode of inheritance for gene: MUT was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: MUT were set to 27604308 Phenotypes for gene: MUT were set to Dehydration, hepatomegaly, lethargy, coma, acidosis, high anion gap; Methylmalonic aciduria; Methylmalonic aciduria, mut(0) type 251000; DCM; Methylmalonyl-CoA mutase deficiency (Organic acidurias); Hypertrophic-hypocontractile cardiomyopathy; metabolic encephalopathy with hyperammonaemia, hypotonia, recurrent episodes of ketoacidosis, liver impairment, psychomotor retardation, recurrent infections. |
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| Cardiomyopathy_Paediatric v0.0 | DES |
Zornitza Stark gene: DES was added gene: DES was added to Cardiomyopathy_Paediatric. Sources: NHS GMS,South West GLH,Expert Review Green Mode of inheritance for gene: DES was set to BOTH monoallelic and biallelic, autosomal or pseudoautosomal Phenotypes for gene: DES were set to Cardiomyopathy, dilated, 1I, |
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