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| Mendeliome v0.12738 | PIGA | Zornitza Stark changed review comment from: PIGA 34875027: variants in PIGA causing a neurodevelopment disorder and a juvenile form of hereditary hemochromatosis reported in > three unrelated patients. All patients had increased serum iron, ferritin and transferrin saturation levels, high ALP and low hepcidin. All patients had generalised seizures and intellectual disability. A subpopulation of patient blood cells showed a slight reduction of GPI-anchored proteins, suggesting that the mutations were hypomorphic and retained some residual activity. CRISPR/Cas12a-mediated knockdown of PIGA in Hep3B liver cells eliminated the cell surface expression of GPI-anchored proteins CD59 and hemojuvelin (HJV; 608374), as well as caused decreased expression of hepcidin (606464) compared to controls. These hypomorphic alleles could explain the milder neurologic phenotype, which allowed for sufficiently long survival for the iron overload phenotype to manifest.; to: PMID 34875027: variants in PIGA causing a neurodevelopment disorder and a juvenile form of hereditary hemochromatosis reported in > three unrelated patients. All patients had increased serum iron, ferritin and transferrin saturation levels, high ALP and low hepcidin. All patients had generalised seizures and intellectual disability. A subpopulation of patient blood cells showed a slight reduction of GPI-anchored proteins, suggesting that the mutations were hypomorphic and retained some residual activity. CRISPR/Cas12a-mediated knockdown of PIGA in Hep3B liver cells eliminated the cell surface expression of GPI-anchored proteins CD59 and hemojuvelin (HJV; 608374), as well as caused decreased expression of hepcidin (606464) compared to controls. These hypomorphic alleles could explain the milder neurologic phenotype, which allowed for sufficiently long survival for the iron overload phenotype to manifest. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.12737 | PIGA | Zornitza Stark edited their review of gene: PIGA: Added comment: PIGA 34875027: variants in PIGA causing a neurodevelopment disorder and a juvenile form of hereditary hemochromatosis reported in > three unrelated patients. All patients had increased serum iron, ferritin and transferrin saturation levels, high ALP and low hepcidin. All patients had generalised seizures and intellectual disability. A subpopulation of patient blood cells showed a slight reduction of GPI-anchored proteins, suggesting that the mutations were hypomorphic and retained some residual activity. CRISPR/Cas12a-mediated knockdown of PIGA in Hep3B liver cells eliminated the cell surface expression of GPI-anchored proteins CD59 and hemojuvelin (HJV; 608374), as well as caused decreased expression of hepcidin (606464) compared to controls. These hypomorphic alleles could explain the milder neurologic phenotype, which allowed for sufficiently long survival for the iron overload phenotype to manifest.; Changed publications: 22305531, 24357517, 24706016, 26545172, 33333793, 32694024, 34875027; Changed phenotypes: Multiple congenital anomalies-hypotonia-seizures syndrome 2, MIM# 300868, MONDO:0010466, Neurodevelopmental disorder with epilepsy and haemochromatosis, MIM# 301072 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.6187 | PIGF |
Paul De Fazio changed review comment from: The same homozygous missense variant identified in 2 individuals from different families from the same region of India. Individuals had a phenotype similar to DOORS syndrome without deafness. Impaired glycosylphosphatidylinositol (GPI) biosynthesis was demonstrated. Rated Red as the two families are likely to be related (founder mutation?). Sources: Literature; to: The same homozygous missense variant identified in 2 individuals from different families from the same region of India. Individuals had a phenotype similar to DOORS syndrome without deafness - only one of the two had seizures (GTCS), the other was 14mo and noted to have tonic posturing. Impaired glycosylphosphatidylinositol (GPI) biosynthesis was demonstrated by flow cytometry and a rescue assay. Alkaline phosphatase in both individuals was normal. Rated Red as the two families are likely to be related (founder mutation?). Sources: Literature |
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| Mendeliome v0.6187 | PIGF |
Paul De Fazio changed review comment from: The same missense variant identified in 2 individuals from different families from the same region of India. Individuals had a phenotype similar to DOORS syndrome without deafness. Impaired glycosylphosphatidylinositol (GPI) biosynthesis was demonstrated. Rated Red as the two families are likely to be related (founder mutation?). Sources: Literature; to: The same homozygous missense variant identified in 2 individuals from different families from the same region of India. Individuals had a phenotype similar to DOORS syndrome without deafness. Impaired glycosylphosphatidylinositol (GPI) biosynthesis was demonstrated. Rated Red as the two families are likely to be related (founder mutation?). Sources: Literature |
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| Mendeliome v0.6187 | PIGF |
Paul De Fazio changed review comment from: Identified in 2 individuals with a phenotype similar to DOORS (syndrome Sources: Literature; to: The same missense variant identified in 2 individuals from different families from the same region of India. Individuals had a phenotype similar to DOORS syndrome without deafness. Impaired glycosylphosphatidylinositol (GPI) biosynthesis was demonstrated. Rated Red as the two families are likely to be related (founder mutation?). Sources: Literature |
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| Mendeliome v0.6106 | GPIHBP1 | Bryony Thompson Marked gene: GPIHBP1 as ready | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.6106 | GPIHBP1 | Bryony Thompson Gene: gpihbp1 has been classified as Green List (High Evidence). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.6106 | GPIHBP1 | Bryony Thompson Classified gene: GPIHBP1 as Green List (high evidence) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.6106 | GPIHBP1 | Bryony Thompson Gene: gpihbp1 has been classified as Green List (High Evidence). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.6105 | GPIHBP1 |
Bryony Thompson gene: GPIHBP1 was added gene: GPIHBP1 was added to Mendeliome. Sources: Expert list Mode of inheritance for gene: GPIHBP1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: GPIHBP1 were set to 17883852; 19304573; 20026666; 17403372 Phenotypes for gene: GPIHBP1 were set to Hyperlipoproteinemia, type 1D MIM#615947; familial chylomicronemia syndrome Review for gene: GPIHBP1 was set to GREEN gene: GPIHBP1 was marked as current diagnostic Added comment: Well-established cause of familial chylomicronemia (see OMIM). Greater than 3 families reported and a supporting mouse model. Sources: Expert list |
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| Mendeliome v0.5483 | GPAA1 | Zornitza Stark edited their review of gene: GPAA1: Added comment: At least 5 unrelated families reported with bi-allelic variants in this gene and delayed psychomotor development, variable intellectual disability, hypotonia, early-onset seizures in most, and cerebellar atrophy, resulting in cerebellar signs including gait ataxia and dysarthria. The disorder is caused by a defect in glycosylphosphatidylinositol (GPI) biosynthesis.; Changed publications: 29100095 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.3768 | GPI | Zornitza Stark Marked gene: GPI as ready | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.3768 | GPI | Zornitza Stark Gene: gpi has been classified as Green List (High Evidence). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.3768 | GPI | Zornitza Stark Phenotypes for gene: GPI were changed from to Hemolytic anemia, nonspherocytic, due to glucose phosphate isomerase deficiency, MIM# 613470 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.3767 | GPI | Zornitza Stark Mode of inheritance for gene: GPI was changed from Unknown to BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.3766 | GPI | Zornitza Stark reviewed gene: GPI: Rating: GREEN; Mode of pathogenicity: None; Publications: ; Phenotypes: Hemolytic anemia, nonspherocytic, due to glucose phosphate isomerase deficiency, MIM# 613470; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Mendeliome v0.3675 | PIGQ |
Zornitza Stark edited their review of gene: PIGQ: Added comment: Homozygous or compound heterozygous mutations in PIGQ cause Epileptic encephalopathy, early infantile, 77 (MIM #618548). Johnstone et al (2020 - PMID: 32588908) describe the phenotype of 7 children (from 6 families) with biallelic PIGQ pathogenic variants. The authors also review the phenotype of 3 subjects previously reported in the literature (by Martin et al, Alazami et al, Starr et al - respective PMIDs: 24463883, 25558065, 31148362). Affected individuals displayed severe to profound global DD/ID and seizures with onset in the first year of life. There were variable other features incl. - among others - genitourinary, cardiac, skeletal, ophthalmological anomalies, gastrointestinal issues. Within the cohort there was significant morbidity/mortality. PIGQ encodes phosphatidylinositol glycan anchor biosynthesis class Q protein, playing a role (early) in the biosynthesis of the GPI-anchor. Several genes in the GPI biosynthesis pathway cause multi-system disease with DD/ID and seizures. Flow cytometry has been used in individuals with PIGQ-related disorder. Serum ALP was elevated in some (4) although - as the authors comment - elevations are more typical in disorders affecting later steps of GPI biosynthesis. More than 10 variants have been reported to date (missense / pLoF).; Changed phenotypes: Epileptic encephalopathy, early infantile, 77, MIM# 618548 |
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| Mendeliome v0.307 | PIGB |
Zornitza Stark gene: PIGB was added gene: PIGB was added to Mendeliome_VCGS. Sources: Literature Mode of inheritance for gene: PIGB was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: PIGB were set to 31256876 Phenotypes for gene: PIGB were set to Epileptic encephalopathy, early infantile, 80; OMIM #618580 Review for gene: PIGB was set to GREEN Added comment: 10 unrelated families with biallelic mutations in PIGB, with global DD and/or ID, and seizures. Two had polymicrogyria, 4 had a peripheral neuropathy, and 2 had a clinical diagnosis of DOORS syndrome. Patient lymphocytes and fibroblasts showed variably decreased levels of cell surface GPI-anchored proteins, including CD16 and CD59. In vitro functional expression studies performed with some of the mutations in PIGB-null CHO cells showed that the mutant proteins were unable to fully restore expression of GPI-anchored surface proteins, consistent with a loss of function, although the mutations had variable effects. Sources: Literature |
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| Mendeliome v0.0 | GPI |
Zornitza Stark gene: GPI was added gene: GPI was added to Mendeliome_VCGS. Sources: Expert Review Green,Victorian Clinical Genetics Services Mode of inheritance for gene: GPI was set to Unknown |
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