rs578185749

Variant names:

• chr22-31843199-C-T
• rs578185749
• NM_001242896.3:c.2620C>T

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_001242896.3(DEPDC5):​c.2620C>T​(p.Arg874*) variant causes a stop gained change. The variant allele was found at a frequency of 0.00000137 in 1,461,480 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. R874R) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: DEPDC5 NM_001242896.3 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:4 O:1
• Conservation: PhyloP100: 4.56
• Publications: 10 publications found

Genes affected

DEPDC5 (HGNC:18423): (DEP domain containing 5, GATOR1 subcomplex subunit) This gene encodes a member of the IML1 family of proteins involved in G-protein signaling pathways. The mechanistic target of rapamycin complex 1 (mTORC1) pathway regulates cell growth by sensing the availability of nutrients. The protein encoded by this gene is a component of the GATOR1 (GAP activity toward Rags) complex which inhibits the amino acid-sensing branch of the mTORC1 pathway. Mutations in this gene are associated with autosomal dominant familial focal epilepsy with variable foci. A single nucleotide polymorphism in an intron of this gene has been associated with an increased risk of hepatocellular carcinoma in individuals with chronic hepatitis C virus infection. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Mar 2014]

DEPDC5 Gene-Disease associations (from GenCC):

• epilepsy, familial focal, with variable foci 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine, Ambry Genetics, Illumina, G2P
• focal epilepsy

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
• autosomal dominant epilepsy with auditory features

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• autosomal dominant nocturnal frontal lobe epilepsy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial focal epilepsy with variable foci

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Brugada syndrome

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

ENSG00000285404 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 22-31843199-C-T is Pathogenic according to our data. Variant chr22-31843199-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 264737.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DEPDC5	NM_001242896.3	c.2620C>T	p.Arg874*	stop_gained	Exon 28 of 43	ENST00000651528.2	NP_001229825.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DEPDC5	ENST00000651528.2	c.2620C>T	p.Arg874*	stop_gained	Exon 28 of 43		NM_001242896.3	ENSP00000498382.1
ENSG00000285404	ENST00000646701.1	c.1786+23974C>T		intron_variant	Intron 20 of 20			ENSP00000496158.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461480 Hom.: 0 Cov.: 30 AF XY: 0.00000275 AC XY: 2 AN XY: 727038

African (AFR) AF: 0.00 AC: 0 AN: 33466

American (AMR) AF: 0.00 AC: 0 AN: 44626

Ashkenazi Jewish (ASJ) AF: 0.0000383 AC: 1 AN: 26130

East Asian (EAS) AF: 0.00 AC: 0 AN: 39688

South Asian (SAS) AF: 0.00 AC: 0 AN: 86152

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53416

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111842

Other (OTH) AF: 0.00 AC: 0 AN: 60394

GnomAD4 genome Cov.: 32

EpiCase AF: 0.00

EpiControl AF: 0.0000593

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Epilepsy, familial focal, with variable foci 1 Pathogenic:2 Other:1

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GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

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Institute of Human Genetics, University Hospital of Duesseldorf

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Mar 01, 2023

Neuberg Centre For Genomic Medicine, NCGM

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The stop gained variant c.2620C>T(p.Arg874Ter) in the DEPDC5 gene has been reported previously in heterozygous state in multiple individuals affected with focal epilepsies (Lal D, et al., 2014; Baldassari S, et al., 2016). This variant is novel in the gnomAD Exomes and 1000 Genomes. It is submitted to ClinVar as Pathogenic. This variant is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay. Loss of function variants have been previously reported to be disease causing. For these reasons, this variant has been classified as Pathogenic. -

Familial focal epilepsy with variable foci Pathogenic:1

Oct 17, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Arg874*) in the DEPDC5 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in DEPDC5 are known to be pathogenic (PMID: 23542697, 23542701). For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 264737). This premature translational stop signal has been observed in individual(s) with epilepsy (PMID: 24591017, 30093711). It has also been observed to segregate with disease in related individuals. This variant is not present in population databases (gnomAD no frequency). -

not provided Pathogenic:1

Jun 02, 2022

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Reported previously as p.(R865*) due to alternate nomenclature in three family members with seizures and/or intellectual disability (Lal et al., 2014); Reported previously in an individual with seizures; inherited from the father with somnambulism (Baldassari et al., 2019); Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Not observed in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 30093711, 29281825, 32574724, 34196989, 33949696, 33741238, 24591017) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.65
CADD	Pathogenic	39
DANN	Uncertain	1.0
Eigen	Pathogenic	0.77
Eigen_PC	Uncertain	0.61
FATHMM_MKL	Pathogenic	0.97	D
PhyloP100		4.6
Vest4		0.89
ClinPred		1.0	D
GERP RS		5.9
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs578185749; hg19: chr22-32239185; COSMIC: COSV99835340; COSMIC: COSV99835340;