16-29813080-C-CT

Position:

• chr16-29813080-C-CT

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_145239.3(PRRT2):​c.27dup​(p.Glu10Ter) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. S9S) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 31)
• Consequence: PRRT2 NM_145239.3 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: -0.617

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]

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

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 95 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 16-29813080-C-CT is Pathogenic according to our data. Variant chr16-29813080-C-CT is described in ClinVar as [Pathogenic]. Clinvar id is 871888.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PRRT2	NM_145239.3	c.27dup	p.Glu10Ter	frameshift_variant	2/4	ENST00000358758.12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PRRT2	ENST00000358758.12	c.27dup	p.Glu10Ter	frameshift_variant	2/4	1	NM_145239.3	P1
MVP-DT	ENST00000569039.5	n.246-2908_246-2907insA		intron_variant, non_coding_transcript_variant		2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Episodic kinesigenic dyskinesia Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 08, 2023

This premature translational stop signal has been observed in individual(s) with paroxysmal kinesigenic dyskinesia (PMID: 26384010). For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 871888). This variant is also known as c.insT27 (p.Ser9*). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Glu10*) 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). -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Jan 01, 2017

- -

Computational scores

Source: dbNSFP v4.3

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

LitVar

Other links and lift over

dbSNP: rs1900057283; hg19: chr16-29824401;