Childhood onset hereditary spastic paraplegia

Gene: ABHD16A

Green List (high evidence)

The rating of this gene has been updated to Green following NHS Genomic Medicine Service approval.

Created: 1 Feb 2023, 2:55 p.m. | Last Modified: 1 Feb 2023, 2:55 p.m.

Panel Version: 3.9

Comment on list classification: New gene added by Zornitza Stark (Australian Genomics). This gene is not associated with a phenotype in OMIM or Gene2Phenotype. There are >3 unrelated cases, therefore there is enough evidence to support a gene-disease association. This gene should be rated Green at the next review.

Created: 13 Oct 2021, 3:10 p.m. | Last Modified: 13 Oct 2021, 3:10 p.m.

Panel Version: 3.1359

Green List (high evidence)

11 individuals from 6 families with a complicated form of hereditary spastic paraplegia who carry bi-allelic deleterious variants in ABHD16A. Affected individuals present with a similar phenotype consisting of global developmental delay/intellectual disability, progressive spasticity affecting the upper and lower limbs, and corpus callosum and white matter anomalies. Immunoblot analysis on extracts from fibroblasts from four affected individuals demonstrated little to no ABHD16A protein levels compared to controls.
In 5 of the families the affected members were homozygous, 3 of these families were consanguineous. 2 families have the same variant- both families are French-Canadian.
4 missense variants, 1 frameshift, 1 nonsense.
Sources: Literature

Created: 11 Oct 2021, 9:17 a.m.

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
Spastic paraplegia; Intellectual disability

Publications

• 34587489

Variants in this GENE are reported as part of current diagnostic practice