rs74315415

Variant names:

• chr20-4699618-C-T
• rs74315415
• NM_000311.5:c.398C>T

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM1 PM2 PP3_Moderate PP5

The NM_000311.5(PRNP):​c.398C>T​(p.Ala133Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. 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 Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PRNP NM_000311.5 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 1.69
• Publications: 14 publications found

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]

PRNP Gene-Disease associations (from GenCC):

• Gerstmann-Straussler-Scheinker syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Genomics England PanelApp, Orphanet
• Huntington disease-like 1

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet
• inherited Creutzfeldt-Jakob disease

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• familial Alzheimer-like prion disease

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• fatal familial insomnia

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• PrP systemic amyloidosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 6 uncertain in NM_000311.5
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.846
• PP5: Variant 20-4699618-C-T is Pathogenic according to our data. Variant chr20-4699618-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 13414.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PRNP	NM_000311.5	c.398C>T	p.Ala133Val	missense_variant	Exon 2 of 2	ENST00000379440.9	NP_000302.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PRNP	ENST00000379440.9	c.398C>T	p.Ala133Val	missense_variant	Exon 2 of 2	1	NM_000311.5	ENSP00000368752.4
PRNP	ENST00000424424.2	c.398C>T	p.Ala133Val	missense_variant	Exon 2 of 2	1		ENSP00000411599.2
PRNP	ENST00000430350.2	c.398C>T	p.Ala133Val	missense_variant	Exon 2 of 2	1		ENSP00000399376.2
PRNP	ENST00000457586.2	c.398C>T	p.Ala133Val	missense_variant	Exon 2 of 2	1		ENSP00000415284.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Gerstmann-Straussler-Scheinker syndrome Pathogenic:1

Mar 13, 2007

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Pathogenic	0.31
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Benign	0.029	T;T;T;.
Eigen	Uncertain	0.29
Eigen_PC	Uncertain	0.36
FATHMM_MKL	Benign	0.74	D
LIST_S2	Uncertain	0.93	.;D;D;D
M_CAP	Benign	0.072	D
MetaRNN	Pathogenic	0.85	D;D;D;D
MetaSVM	Pathogenic	0.83	D
MutationAssessor	Benign	1.7	L;L;.;.
PhyloP100		1.7
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	-0.86	N;N;N;N
REVEL	Pathogenic	0.72
Sift	Uncertain	0.014	D;D;D;D
Sift4G	Benign	0.20	T;T;T;T
Polyphen		0.020	B;B;.;.
Vest4		0.19
MutPred		0.76		Gain of sheet (P = 0.1451);Gain of sheet (P = 0.1451);Gain of sheet (P = 0.1451);Gain of sheet (P = 0.1451);
MVP		1.0
MPC		0.49
ClinPred		0.84	D
GERP RS		5.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.48
gMVP		0.90
Mutation Taster		=1/99	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs74315415; hg19: chr20-4680264;