rs74315410

chr20-4699612-G-Achr20-4699612-G-T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2 PM5 PP3_Moderate PP5_Moderate

The NM_000311.5(PRNP):c.392G>A(p.Gly131Glu) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G131V) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PRNP NM_000311.5 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 6.02

Genes affected

PRNP (HGNC:9449): (prion protein (Kanno blood group)) The protein encoded by this gene is a membrane glycosylphosphatidylinositol-anchored glycoprotein that tends to aggregate into rod-like structures. The encoded protein contains a highly unstable region of five tandem octapeptide repeats. This gene is found on chromosome 20, approximately 20 kbp upstream of a gene which encodes a biochemically and structurally similar protein to the one encoded by this gene. Mutations in the repeat region as well as elsewhere in this gene have been associated with Creutzfeldt-Jakob disease, fatal familial insomnia, Gerstmann-Straussler disease, Huntington disease-like 1, and kuru. An overlapping open reading frame has been found for this gene that encodes a smaller, structurally unrelated protein, AltPrp. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Nov 2014]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr20-4699612-G-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 13410.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.863
• PP5: Variant 20-4699612-G-A is Pathogenic according to our data. Variant chr20-4699612-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1334094.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PRNP	NM_000311.5	c.392G>A	p.Gly131Glu	missense_variant	2/2	ENST00000379440.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PRNP	ENST00000379440.9	c.392G>A	p.Gly131Glu	missense_variant	2/2	1	NM_000311.5	P1
PRNP	ENST00000424424.2	c.392G>A	p.Gly131Glu	missense_variant	2/2	1		P1
PRNP	ENST00000430350.2	c.392G>A	p.Gly131Glu	missense_variant	2/2	1		P1
PRNP	ENST00000457586.2	c.392G>A	p.Gly131Glu	missense_variant	2/2	1		P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

EpiCase AF: 0.0000545

EpiControl AF: 0.00

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Gerstmann-Straussler-Scheinker syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Centogene AG - the Rare Disease Company

Jul 17, 2019

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.48	D
BayesDel_noAF	Pathogenic	0.45
Cadd	Pathogenic	27
Dann	Uncertain	1.0
DEOGEN2	Benign	0.12	T;T;T;.
Eigen	Pathogenic	0.78
Eigen_PC	Pathogenic	0.75
FATHMM_MKL	Uncertain	0.92	D
M_CAP	Pathogenic	0.31	D
MetaRNN	Pathogenic	0.86	D;D;D;D
MetaSVM	Pathogenic	0.91	D
MutationAssessor	Uncertain	2.2	M;M;.;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.65	T
PROVEAN	Uncertain	-2.7	D;D;D;N
REVEL	Pathogenic	0.83
Sift	Pathogenic	0.0	D;D;D;D
Sift4G	Pathogenic	0.0010	D;D;D;D
Polyphen		1.0	D;D;.;.
Vest4		0.91
MutPred		0.54		Gain of helix (P = 0.132);Gain of helix (P = 0.132);Gain of helix (P = 0.132);Gain of helix (P = 0.132);
MVP		1.0
MPC		1.6
ClinPred		0.99	D
GERP RS		5.3
Varity_R		0.93
gMVP		0.98

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr20-4680258;