16-29813703-C-T

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_145239.3(PRRT2):c.649C>T(p.Arg217*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000021 in 1,426,562 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. R217R) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

PRRT2
NM_145239.3 stop_gained

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:9

Conservation

PhyloP100: 2.22

Publications

11 publications found

Variant links:

Genes affected

PRRT2 (HGNC:30500): (proline rich transmembrane protein 2) This gene encodes a transmembrane protein containing a proline-rich domain in its N-terminal half. Studies in mice suggest that it is predominantly expressed in brain and spinal cord in embryonic and postnatal stages. Mutations in this gene are associated with episodic kinesigenic dyskinesia-1. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jan 2012]

PRRT2 links:

ENSG00000280893 (HGNC:):

ENSG00000280893 links:

MVP-DT (HGNC:56029): (MVP divergent transcript)

MVP-DT links:

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ACMG classification

Classification was made for transcript

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 16-29813703-C-T is Pathogenic according to our data. Variant chr16-29813703-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 468617.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
PRRT2	NM_145239.3 link	c.649C>T	p.Arg217*	stop_gained	Exon 2 of 4	ENST00000358758.12	NP_660282.2	Q7Z6L0-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PRRT2	ENST00000358758.12 link	c.649C>T	p.Arg217*	stop_gained	Exon 2 of 4	1	NM_145239.3	ENSP00000351608.7		Q7Z6L0-1
ENSG00000280893	ENST00000609618.2 link	n.649C>T		non_coding_transcript_exon_variant	Exon 2 of 6	5		ENSP00000476774.2		A0A0G2JLL6

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000210

AC:

AN:

1426562

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

707416

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32268

American (AMR)

AF:

0.00

AC:

AN:

40964

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23864

East Asian (EAS)

AF:

0.00

AC:

AN:

38912

South Asian (SAS)

AF:

0.00

AC:

AN:

81748

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51828

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5612

European-Non Finnish (NFE)

AF:

0.00000275

AC:

AN:

1092724

Other (OTH)

AF:

0.00

AC:

AN:

58642

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:9

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:4

Genome Diagnostics Laboratory, Amsterdam University Medical Center

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Aug 01, 2023

CeGaT Center for Human Genetics Tuebingen

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

PRRT2: PVS1, PM2, PP1:Moderate, PS4:Moderate, PS3:Supporting -

Jun 29, 2022

GeneDx

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

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 at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 25340963, 28074849, 22464846, 22902309, 23551744, 22744660, 23363396, 24370076, 22752065, 29285950, 29655203, 32651081) -

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Infantile convulsions and choreoathetosis

Pathogenic:2

Jan 20, 2020

Baylor Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was determined to be pathogenic according to ACMG Guidelines, 2015 [PMID:25741868]. -

Aug 06, 2023

3billion

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The variant is not observed in the gnomAD v2.1.1 dataset. Predicted Consequence/Location: Stop-gained (nonsense): predicted to result in a loss or disruption of normal protein function through nonsense-mediated decay (NMD) or protein truncation. Multiple pathogenic variants are reported downstream of the variant. The variant has been reported at least twice as pathogenic without evidence for the classification (ClinVar ID: VCV000468617 /PMID: 22744660). Therefore, this variant is classified as Pathogenic according to the recommendation of ACMG/AMP guideline. -

PRRT2-associated paroxysmal movement disorder

Pathogenic:1

Oct 09, 2024

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Based on the classification scheme VCGS_Germline_v1.3.5, this variant is classified as Pathogenic. Following criteria are met: 0102 - Loss of function is a known mechanism of disease in this gene and is associated with familial infantile convulsions with paroxysmal choreoathetosis (MIM#602066), episodic kinesigenic dyskinesia 1 (MIM#128200), benign familial infantile seizures 2 (MIM#605751) and self-limited familial and non-familial infantile seizures (MONDO#0100024). (I) 0107 - This gene is associated with autosomal dominant disease. (I) 0112 - The condition associated with this gene has incomplete penetrance. Reduced penetrance has been reported for paroxysmal kinesigenic dyskinesia (PMID: 29334453). (I) 0115 - Variants in this gene are known to have variable expressivity. Variation in phenotype has been reported within and between families with the same pathogenic variant (PMID: 29334453). (I) 0201 - Variant is predicted to cause nonsense-mediated decay (NMD) and loss of protein (premature termination codon is located at least 54 nucleotides upstream of the final exon-exon junction). (SP) 0251 - This variant is heterozygous. (I) 0302 - Variant is present in gnomAD (v4) <0.001 for a dominant condition (3 heterozygotes, 0 homozygotes). (SP) 0701 - Other NMD-predicted variants comparable to the one identified in this case have very strong previous evidence for pathogenicity (DECIPHER). (SP) 0801 - This variant has strong previous evidence of pathogenicity in unrelated individuals. This variant has been classified as pathogenic by multiple clinical laboratories in ClinVar, and has been observed in a family with PRRT2-related symptoms (PMID: 28074849). (SP) 1101 - Very strong and specific phenotype match for this individual. (SP) 1205 - This variant has been shown to be maternally inherited (by trio analysis). (I) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign -

Seizures, benign familial infantile, 2

Pathogenic:1

Aug 29, 2022

MGZ Medical Genetics Center

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Episodic kinesigenic dyskinesia

Pathogenic:1

Nov 16, 2024

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.Arg217*) in the PRRT2 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in PRRT2 are known to be pathogenic (PMID: 22623405, 22744660). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individuals with paroxysmal kinesigenic dyskinesia, and infantile convulsions and paroxysmal choreoathetosis (PMID: 22464846, 22744660, 22752065, 22902309, 23363396, 28074849). ClinVar contains an entry for this variant (Variation ID: 468617). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.60

BayesDel_noAF

Pathogenic

0.45

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

Eigen

Uncertain

0.48

Eigen_PC

Uncertain

0.26

FATHMM_MKL

Benign

0.25

PhyloP100

2.2

Vest4

0.92

GERP RS

2.9

Mutation Taster

=1/199

disease causing (ClinVar)

(source)

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over