NM_000311.5:c.198G>A

Variant names:

• chr20-4699418-G-A
• rs750069679
• NM_000311.5:c.198G>A

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_Strong BP7 BS2

The NM_000311.5(PRNP):​c.198G>A​(p.Gly66Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000548 in 1,460,692 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 Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: PRNP NM_000311.5 synonymous
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -5.68
• Publications: 1 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: Benign. The variant received -9 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.93).
• BP7: Synonymous conserved (PhyloP=-5.68 with no splicing effect.
• BS2: High AC in GnomAdExome4 at 8 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000311.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PRNP	NM_000311.5	MANE Select	c.198G>A	p.Gly66Gly	synonymous	Exon 2 of 2	NP_000302.1
	PRNP	NM_001271561.3		c.109G>A	p.Ala37Thr	missense	Exon 2 of 2	NP_001258490.1
	PRNP	NM_001080121.3		c.198G>A	p.Gly66Gly	synonymous	Exon 2 of 2	NP_001073590.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PRNP	ENST00000379440.9	TSL:1 MANE Select	c.198G>A	p.Gly66Gly	synonymous	Exon 2 of 2	ENSP00000368752.4
	PRNP	ENST00000424424.2	TSL:1	c.198G>A	p.Gly66Gly	synonymous	Exon 2 of 2	ENSP00000411599.2
	PRNP	ENST00000430350.2	TSL:1	c.198G>A	p.Gly66Gly	synonymous	Exon 2 of 2	ENSP00000399376.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000406 AC: 1 AN: 246494 AF XY: 0.00000746

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000548 AC: 8 AN: 1460692 Hom.: 0 Cov.: 31 AF XY: 0.00000826 AC XY: 6 AN XY: 726648

African (AFR) AF: 0.00 AC: 0 AN: 33402

American (AMR) AF: 0.00 AC: 0 AN: 44690

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26118

East Asian (EAS) AF: 0.00 AC: 0 AN: 39682

South Asian (SAS) AF: 0.0000928 AC: 8 AN: 86170

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53200

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5492

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111640

Other (OTH) AF: 0.00 AC: 0 AN: 60298

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000361 Hom.: 0

ClinVar

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Spongiform encephalopathy with neuropsychiatric features (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.93
CADD	Benign	0.066
DANN	Benign	0.37
PhyloP100		-5.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Mutation Taster		=100/0	polymorphism

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: rs750069679; hg19: chr20-4680064;