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Skeletal dysplasia v4.48 IDH2 Sarah Leigh changed review comment from: IDH2 variants have been associated with D-2-hydroxyglutaric aciduria 2 (OMIM:613657). PMID: 36042521 reports IDH2 variants at codon 172 (p.R172T, p.R172S, p.R172G) in seven cases of chondrosarcoma central conventional and two case of chondrosarcoma central dedifferentiated. The authors of PMID: 36042521 comment "IDH2 tumours present as larger tumours and on average over a decade later than IDH1 tumours". Based on the finding that the IDH1 and IDH2 tumours have similar molecular ages, the authors suggest that the IDH2 tumours have slower rate of cell division, with the result that the tumours undergo growth arrest and become calcified. They go onto speculate, that if this is the case, many IDH2 tumours would not become malignant and would only be detected if medical imaging was being used for an unrelated cause.
This gene is rated as amber, because the variants are somatic, occurring in the tumour.; to: IDH2 variants have been associated with D-2-hydroxyglutaric aciduria 2 (OMIM:613657). PMID: 36042521 reports IDH2 variants at codon 172 (p.R172T, p.R172S, p.R172G) in seven cases of chondrosarcoma central conventional and two case of chondrosarcoma central dedifferentiated. The authors of PMID: 36042521 comment "IDH2 tumours present as larger tumours and on average over a decade later than IDH1 tumours". Based on the finding that the IDH1 and IDH2 tumours have similar molecular ages, the authors suggest that the IDH2 tumours have slower rate of cell division, with the result that the tumours undergo growth arrest and become calcified. They go onto speculate, that if this is the case, many IDH2 tumours would not become malignant and would only be detected if medical imaging was being used for an unrelated cause.
This gene is rated as red, because the variants are somatic, occurring in the tumour.
Skeletal dysplasia v4.43 IDH2 Sarah Leigh changed review comment from: IDH2 variants have been associated with D-2-hydroxyglutaric aciduria 2 (OMIM:613657). PMID: 36042521 reports IDH2 variants at codon 172 (p.R172T, p.R172S, p.R172G) in seven cases of chondrosarcoma central conventional and two case of chondrosarcoma central dedifferentiated. The authors of PMID: 36042521 comment "IDH2 tumours present as larger tumours and on average over a decade later than IDH1 tumours". Based on the finding that the IDH1 and IDH2 tumours have similar molecular ages, the authors suggest that the IDH2 tumours have slower rate of cell division, with the result that the tumours undergo growth arrest and become calcified. They go onto speculate, that if this is the case, many IDH2 tumours would not become malignant and would only be detected if medical imaging was being used for an unrelated cause.; to: IDH2 variants have been associated with D-2-hydroxyglutaric aciduria 2 (OMIM:613657). PMID: 36042521 reports IDH2 variants at codon 172 (p.R172T, p.R172S, p.R172G) in seven cases of chondrosarcoma central conventional and two case of chondrosarcoma central dedifferentiated. The authors of PMID: 36042521 comment "IDH2 tumours present as larger tumours and on average over a decade later than IDH1 tumours". Based on the finding that the IDH1 and IDH2 tumours have similar molecular ages, the authors suggest that the IDH2 tumours have slower rate of cell division, with the result that the tumours undergo growth arrest and become calcified. They go onto speculate, that if this is the case, many IDH2 tumours would not become malignant and would only be detected if medical imaging was being used for an unrelated cause.
This gene is rated as amber, because the variants are somatic, occurring in the tumour.
Skeletal dysplasia v4.39 IDH2 Sarah Leigh edited their review of gene: IDH2: Added comment: IDH2 variants have been associated with D-2-hydroxyglutaric aciduria 2 (OMIM:613657). PMID: 36042521 reports IDH2 variants at codon 172 (p.R172T, p.R172S, p.R172G) in seven cases of chondrosarcoma central conventional and two case of chondrosarcoma central dedifferentiated. The authors of PMID: 36042521 comment "IDH2 tumours present as larger tumours and on average over a decade later than IDH1 tumours". Based on the finding that the IDH1 and IDH2 tumours have similar molecular ages, the authors suggest that the IDH2 tumours have slower rate of cell division, with the result that the tumours undergo growth arrest and become calcified. They go onto speculate, that if this is the case, many IDH2 tumours would not become malignant and would only be detected if medical imaging was being used for an unrelated cause.; Changed rating: GREEN
Skeletal dysplasia v4.35 TP53 Adrienne Flanagan gene: TP53 was added
gene: TP53 was added to Skeletal dysplasia. Sources: Literature
Mode of inheritance for gene: TP53 was set to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Publications for gene: TP53 were set to PMID: 33147331
Phenotypes for gene: TP53 were set to Central conventional chondrosrcoma
Review for gene: TP53 was set to GREEN
Added comment: Inactivating mutations in TP53 are common in dedifferentiated chondrosarcoma (DDCS) and, in a subset of cases, the TP53 mutation is restricted to the dedifferentiated nonchondrogenic component (8/11, 73% of the cases tested). Half of the tumours where the conventional chondrogenic component was paired with the high-grade non-chondrogenic component showed TP53 mutation in the chondrogenic area (3/6, 50%). These findings imply that TP53 alterations occur late in tumorigenesis, potentially with a TP53-mutant subclone that progresses to the dedifferentiated component in DDCS. Identification of TP53 mutation in an otherwise low-grade central chondrosarcoma may indicate the tumor is at increased risk of dedifferentiation.
Genetic testing for TP53 along with IDH1, IDH2 and TERT promoter mutations in central conventional chondrosarcoma could be useful in patient stratification.
Sources: Literature
Skeletal dysplasia v1.153 IDH1 Eleanor Williams Added phenotypes Metaphyseal chondromatosis with D-2-hydroxyglutaric aciduria 614875; Maffucci syndrome 614569; Ollier disease/ Dyschondroplasia 166000 for gene: IDH1
Publications for gene IDH1 were changed from 22025298; 22057234 to 24049096; 22025298; 22057234; 22057236
Skeletal dysplasia v1.147 IDH1 Tracy Lester reviewed gene: IDH1: Rating: AMBER; Mode of pathogenicity: Other - please provide details in the comments; Publications: 22025298, 22057236, 22057234, 24049096; Phenotypes: Metaphyseal chondromatosis with D-2-hydroxyglutaric aciduria 614875, Maffucci syndrome 614569, Ollier disease/ Dyschondroplasia 166000; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Skeletal dysplasia v1.146 IDH1 Eleanor Williams reviewed gene: IDH1: Rating: AMBER; Mode of pathogenicity: ; Publications: ; Phenotypes: ; Mode of inheritance:
Skeletal dysplasia v1.145 IDH1 Eleanor Williams Source NHS GMS was added to IDH1.
Rating Changed from Green List (high evidence) to Green List (high evidence)
Skeletal dysplasia IDH1 Sarah Leigh classified IDH1 as green