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| Intellectual disability syndromic and non-syndromic v1.213 | BLOC1S1 |
Rylee Peters changed review comment from: De Pace et al. 2025 [preprint] doi: https://doi.org/10.1101/2025.07.17.25331211 11 individuals from seven unrelated families (includes 4 individuals from 3 families described in Bertoli-Avella PMID: 33875846), with severe neurodevelopmental disorder and harbour biallelic variants of BLOC1S1. The disorder presents with early infantile onset and is characterised by deficient myelination, global developmental delay, intellectual disability, hypotonia, epilepsy (in some cases), and visual impairment (bilateral optic atrophy in most). The severity ranged from early death to a milder form with preserved ambulation and single-word communication. All individuals harbouring BLOC1S1 variants with available neuroimaging exhibit hypomyelinating leukodystrophy. Functional analyses show that BLOC1S1 KO impairs the anterograde transport of lysosomes and autophagy in both non-neuronal cells and iPSC-derived neurons. Missense variants displayed various combinations of defective expression, assembly, lysosome dispersal and/or autophagy. The frameshift variant showed the most severe deficiencies in tested assays.; to: De Pace et al. 2025 [preprint] doi: https://doi.org/10.1101/2025.07.17.25331211 11 individuals from seven unrelated families (includes 4 individuals from 3 families described in Bertoli-Avella PMID: 33875846), with severe neurodevelopmental disorder and harbour biallelic variants of BLOC1S1. The disorder presents with early infantile onset and is characterised by deficient myelination, global developmental delay, intellectual disability, hypotonia, epilepsy, and visual impairment (bilateral optic atrophy in most). The severity ranged from early death to a milder form with preserved ambulation and single-word communication. All individuals harbouring BLOC1S1 variants with available neuroimaging exhibit hypomyelinating leukodystrophy. Functional analyses show that BLOC1S1 KO impairs the anterograde transport of lysosomes and autophagy in both non-neuronal cells and iPSC-derived neurons. Missense variants displayed various combinations of defective expression, assembly, lysosome dispersal and/or autophagy. The frameshift variant showed the most severe deficiencies in tested assays. |
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| Intellectual disability syndromic and non-syndromic v1.213 | BLOC1S1 | Rylee Peters reviewed gene: BLOC1S1: Rating: GREEN; Mode of pathogenicity: None; Publications: https://www.medrxiv.org/content/10.1101/2025.07.17.25331211v1; Phenotypes: Neurodevelopmental disorder (MONDO:0700092), BLOC1S1-related; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5482 | BLOC1S1 | Zornitza Stark Phenotypes for gene: BLOC1S1 were changed from severe intellectual disability; severe global developmental delay; epilepsy to Neurodevelopmental disorder, MONDO:0700092, BLOC1S1-related | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.5481 | BLOC1S1 | Zornitza Stark edited their review of gene: BLOC1S1: Changed phenotypes: Neurodevelopmental disorder, MONDO:0700092, BLOC1S1-related | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4348 | BLOC1S1 | Zornitza Stark Marked gene: BLOC1S1 as ready | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4348 | BLOC1S1 | Zornitza Stark Gene: bloc1s1 has been classified as Green List (High Evidence). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4348 | BLOC1S1 | Zornitza Stark Classified gene: BLOC1S1 as Green List (high evidence) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4348 | BLOC1S1 | Zornitza Stark Gene: bloc1s1 has been classified as Green List (High Evidence). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability syndromic and non-syndromic v0.4347 | BLOC1S1 |
Zornitza Stark gene: BLOC1S1 was added gene: BLOC1S1 was added to Intellectual disability syndromic and non-syndromic. Sources: Literature Mode of inheritance for gene: BLOC1S1 was set to BIALLELIC, autosomal or pseudoautosomal Publications for gene: BLOC1S1 were set to 33875846 Phenotypes for gene: BLOC1S1 were set to severe intellectual disability; severe global developmental delay; epilepsy Review for gene: BLOC1S1 was set to GREEN Added comment: 4 individuals reported. Sources: Literature |
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