Genetic Epilepsy
Gene: DEPDC5 Green List (high evidence)Green List (high evidence)
PMID: 36067010 - Homozygous missense variants were identified in five families (3x Irish Traveller families with same variant; and 1x Tunisian and 1x Lebanese families with the same variant; ie. 2 different variants only) in 9 children with consistent phenotypic features including extensive bilateral polymicrogyria, congenital macrocephaly, early onset refractory epilepsy and severe developmental delay. Skin biopsy immunohistochemistry suggested hyperactivation of the mTOR pathway. Disease mechanism is LOF as DEPDC5 is a repressor/inhibitor within the mTOR pathway.
PMID: 32848577 - A different homozygous missense variant was identified in a child with focal cortical dysplasia and childhood onset epilepsy.Created: 6 Oct 2022, 4:09 a.m. | Last Modified: 6 Oct 2022, 4:09 a.m.
Panel Version: 0.1684
Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal
Phenotypes
polymicrogyria; macrocephaly; epilepsy; developmental delay
Publications
Green List (high evidence)
Familial focal epilepsy with variable foci (FFEVF) is an autosomal dominant form of epilepsy characterized by focal seizures arising from different cortical regions in different family members. Many patients have an aura and show automatisms during the seizures, whereas others may have nocturnal seizures. There is often secondary generalization. Some patients show abnormal interictal EEG, and some patients have intellectual disability or autism spectrum disorders. Seizure onset usually occurs in the first or second decades, although later onset has been reported, and there is phenotypic variability within families. Penetrance of the disorder is incomplete.
Well established gene-disease association, multiple families.Created: 6 May 2022, 8:27 a.m. | Last Modified: 6 May 2022, 8:27 a.m.
Panel Version: 0.1592
Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Phenotypes
Epilepsy, familial focal, with variable foci 1 MIM#604364
Publications
Phenotypes for gene: DEPDC5 were changed from Epilepsy, familial focal, with variable foci 1 MIM#604364; Neurodevelopmental disorder, DEPDC5-related, MONDO:0700092 to Epilepsy, familial focal, with variable foci 1 MIM#604364; Developmental and epileptic encephalopathy 111, MIM# 620504
Mode of inheritance for gene: DEPDC5 was changed from BOTH monoallelic and biallelic, autosomal or pseudoautosomal to BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Phenotypes for gene: DEPDC5 were changed from Epilepsy, familial focal, with variable foci 1 MIM#604364 to Epilepsy, familial focal, with variable foci 1 MIM#604364; Neurodevelopmental disorder, DEPDC5-related, MONDO:0700092
Mode of inheritance for gene: DEPDC5 was changed from MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted to BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Gene: depdc5 has been classified as Green List (High Evidence).
Phenotypes for gene: DEPDC5 were changed from to Epilepsy, familial focal, with variable foci 1 MIM#604364
Publications for gene: DEPDC5 were set to
Mode of inheritance for gene: DEPDC5 was changed from Unknown to MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
gene: DEPDC5 was added gene: DEPDC5 was added to Genetic Epilepsy_AustralianGenomics_VCGS. Sources: Australian Genomics Health Alliance Epilepsy Flagship,Expert Review Green,Victorian Clinical Genetics Services Mode of inheritance for gene: DEPDC5 was set to Unknown
If promoting or demoting a gene, please provide comments to justify a decision to move it.
Genes included in a Genomics England gene panel for a rare disease category (green list) should fit the criteria A-E outlined below.
These guidelines were developed as a combination of the ClinGen DEFINITIVE evidence for a causal role of the gene in the disease(a), and the Developmental Disorder Genotype-Phenotype (DDG2P) CONFIRMED DD Gene evidence level(b) (please see the original references provided below for full details). These help provide a guideline for expert reviewers when assessing whether a gene should be on the green or the red list of a panel.
A. There are plausible disease-causing mutations(i) within, affecting or encompassing an interpretable functional region(ii) of this gene identified in multiple (>3) unrelated cases/families with the phenotype(iii).
OR
B. There are plausible disease-causing mutations(i) within, affecting or encompassing cis-regulatory elements convincingly affecting the expression of a single gene identified in multiple (>3) unrelated cases/families with the phenotype(iii).
OR
C. As definitions A or B but in 2 or 3 unrelated cases/families with the phenotype, with the addition of convincing bioinformatic or functional evidence of causation e.g. known inborn error of metabolism with mutation in orthologous gene which is known to have the relevant deficient enzymatic activity in other species; existence of an animal model which recapitulates the human phenotype.
AND
D. Evidence indicates that disease-causing mutations follow a Mendelian pattern of causation appropriate for reporting in a diagnostic setting(iv).
AND
E. No convincing evidence exists or has emerged that contradicts the role of the gene in the specified phenotype.
(i)Plausible disease-causing mutations: Recurrent de novo mutations convincingly affecting gene function. Rare, fully-penetrant mutations - relevant genotype never, or very rarely, seen in controls. (ii) Interpretable functional region: ORF in protein coding genes miRNA stem or loop. (iii) Phenotype: the rare disease category, as described in the eligibility statement. (iv) Intermediate penetrance genes should not be included.
It’s assumed that loss-of-function variants in this gene can cause the disease/phenotype unless an exception to this rule is known. We would like to collect information regarding exceptions. An example exception is the PCSK9 gene, where loss-of-function variants are not relevant for a hypercholesterolemia phenotype as they are associated with increased LDL-cholesterol uptake via LDLR (PMID: 25911073).
If a curated set of known-pathogenic variants is available for this gene-phenotype, please contact us at panelapp@genomicsengland.co.uk
We classify loss-of-function variants as those with the following Sequence Ontology (SO) terms:
Term descriptions can be found on the PanelApp homepage and Ensembl.
If you are submitting this evaluation on behalf of a clinical laboratory please indicate whether you report variants in this gene as part of your current diagnostic practice by checking the box
Standardised terms were used to represent the gene-disease mode of inheritance, and were mapped to commonly used terms from the different sources. Below each of the terms is described, along with the equivalent commonly-used terms.
A variant on one allele of this gene can cause the disease, and imprinting has not been implicated.
A variant on the paternally-inherited allele of this gene can cause the disease, if the alternate allele is imprinted (function muted).
A variant on the maternally-inherited allele of this gene can cause the disease, if the alternate allele is imprinted (function muted).
A variant on one allele of this gene can cause the disease. This is the default used for autosomal dominant mode of inheritance where no knowledge of the imprinting status of the gene required to cause the disease is known. Mapped to the following commonly used terms from different sources: autosomal dominant, dominant, AD, DOMINANT.
A variant on both alleles of this gene is required to cause the disease. Mapped to the following commonly used terms from different sources: autosomal recessive, recessive, AR, RECESSIVE.
The disease can be caused by a variant on one or both alleles of this gene. Mapped to the following commonly used terms from different sources: autosomal recessive or autosomal dominant, recessive or dominant, AR/AD, AD/AR, DOMINANT/RECESSIVE, RECESSIVE/DOMINANT.
A variant on one allele of this gene can cause the disease, however a variant on both alleles of this gene can result in a more severe form of the disease/phenotype.
A variant in this gene can cause the disease in males as they have one X-chromosome allele, whereas a variant on both X-chromosome alleles is required to cause the disease in females. Mapped to the following commonly used term from different sources: X-linked recessive.
A variant in this gene can cause the disease in males as they have one X-chromosome allele. A variant on one allele of this gene may also cause the disease in females, though the disease/phenotype may be less severe and may have a later-onset than is seen in males. X-linked inactivation and mosaicism in different tissues complicate whether a female presents with the disease, and can change over their lifetime. This term is the default setting used for X-linked genes, where it is not known definitately whether females require a variant on each allele of this gene in order to be affected. Mapped to the following commonly used terms from different sources: X-linked dominant, x-linked, X-LINKED, X-linked.
The gene is in the mitochondrial genome and variants within this can cause this disease, maternally inherited. Mapped to the following commonly used term from different sources: Mitochondrial.
Mapped to the following commonly used terms from different sources: Unknown, NA, information not provided.
For example, if the mode of inheritance is digenic, please indicate this in the comments and which other gene is involved.