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| Likely inborn error of metabolism - targeted testing not possible v5.3 | VPS16 | Achchuthan Shanmugasundram Tag Q4_23_promote_green was removed from gene: VPS16. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Likely inborn error of metabolism - targeted testing not possible v5.3 | VPS16 | Sarah Leigh commented on gene: VPS16: The rating of this gene has been updated to green and the mode of inheritance set to BIALLELIC, autosomal or pseudoautosomal following NHS Genomic Medicine Service approval. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Likely inborn error of metabolism - targeted testing not possible v5.2 | VPS16 |
Achchuthan Shanmugasundram Source Expert Review Green was added to VPS16. Source NHS GMS was added to VPS16. Rating Changed from Amber List (moderate evidence) to Green List (high evidence) |
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| Likely inborn error of metabolism - targeted testing not possible v4.116 | VPS16 | Sarah Leigh Classified gene: VPS16 as Amber List (moderate evidence) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Likely inborn error of metabolism - targeted testing not possible v4.116 | VPS16 | Sarah Leigh Added comment: Comment on list classification: There is enough evidence for this gene to be rated GREEN at the next major review. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Likely inborn error of metabolism - targeted testing not possible v4.116 | VPS16 | Sarah Leigh Gene: vps16 has been classified as Amber List (Moderate Evidence). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Likely inborn error of metabolism - targeted testing not possible v4.115 | VPS16 |
Sarah Leigh Added comment: Comment on mode of inheritance: Biallelic variants are associated with a phenotype resembling a lysosomal storage disease. There are sufficient families (3) and functional data showing defects in the endolysosomal trafficking system to support inclusion for this allelic requirement. Monoallelic variants are linked to dystonia but only one study performed further analyses that suggested lysosomal dysfunction. Therefore while possible, it is unclear whether the 'Lysosomal storage disorder' panel would be applied in these cases. VPS16 will be flagged for GMS review with regards to the most appropriate MOI on this panel (biallelic or both bilalleic/monoallelic) Arina Puzriakova (Genomics England Curator), 14 Jun 2021 |
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| Likely inborn error of metabolism - targeted testing not possible v4.115 | VPS16 | Sarah Leigh Mode of inheritance for gene: VPS16 was changed from BIALLELIC, autosomal or pseudoautosomal to BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Likely inborn error of metabolism - targeted testing not possible v4.114 | VPS16 |
Sarah Leigh gene: VPS16 was added gene: VPS16 was added to Likely inborn error of metabolism - targeted testing not possible. Sources: Other Q4_23_promote_green tags were added to gene: VPS16. Mode of inheritance for gene: VPS16 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: VPS16 were set to 33938619; 34013567 Phenotypes for gene: VPS16 were set to Mucopolysaccharidosis-like syndrome (biallelic); Dystonia Associated with Lysosomal Abnormalities (monoallelic); Dystonia 30, OMIM:619291 Review for gene: VPS16 was set to GREEN Added comment: Copied from Lysosomal storage disorder panel: Four individuals from three families were identified (PMIDs: 33938619; 34013567) exhibiting a mucopolysaccharidosis (MPS)-like lysosomal storage phenotype with short stature, coarse facies, DD or regression, peripheral neuropathy, skeletal dysplasia, neutropenia, and high-normal glycosaminoglycan excretion. All harboured homozygous variants in VPS16 which segregated with disease, including a missense variant in a sib pair (c.540G>T; p.Trp180Cys) and a recurrent intronic variant (c.2272‐18C>A) in two supposedly unrelated patients (although both of Middle Eastern descent). Fibroblasts of the two patients with the intronic variant showed accumulation of lysosomal compartments and autophagosomes with significantly decreased VPS16 mRNA and protein levels, as well as HOPS/CORVET complexes. Cellular phenotypes were rescued upon re-expression of wild-type VPS16. ----- Heterozygous variants, as well as a homozygous missense variant (c.156C>A) found in a consanguineous Chinese family (PMID:27174565), have been found to cause dystonia with variable onset (OMIM:619291). It has been suggested that the discrepancies in patient phenotypes are due to different mechanisms of pathogenicity, where variants causing dystonia do not affect the levels of endolysosomal tethering (HOPS/CORVET) complexes. More research is needed to clarify the mechanisms underlying VPS16-related dystonia as only limited functional data is currently available - Steel et al. 2020 (PMID:32808683) did perform electron microscopic studies of lymphocytes and fibroblasts derived from 2 unrelated patients, which showed vacuolar abnormalities suggestive of impaired lysosomal function. Sources: Literature Arina Puzriakova (Genomics England Curator), 14 Jun 2021 Sources: Other |
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