6-162443345-C-A

Variant names:

• chr6-162443345-C-A
• rs75860381
• NM_004562.3:c.136G>T

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_004562.3(PRKN):​c.136G>T​(p.Ala46Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000205 in 1,460,782 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 Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A46T) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: PRKN NM_004562.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.34
• Publications: 14 publications found

Genes affected

PRKN (HGNC:8607): (parkin RBR E3 ubiquitin protein ligase) The precise function of this gene is unknown; however, the encoded protein is a component of a multiprotein E3 ubiquitin ligase complex that mediates the targeting of substrate proteins for proteasomal degradation. Mutations in this gene are known to cause Parkinson disease and autosomal recessive juvenile Parkinson disease. Alternative splicing of this gene produces multiple transcript variants encoding distinct isoforms. Additional splice variants of this gene have been described but currently lack transcript support. [provided by RefSeq, Jul 2008]

PRKN Gene-Disease associations (from GenCC):

• autosomal recessive juvenile Parkinson disease 2

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Laboratory for Molecular Medicine, Genomics England PanelApp
• Parkinson disease

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• young-onset Parkinson disease

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.816

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004562.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PRKN	NM_004562.3	MANE Select	c.136G>T	p.Ala46Ser	missense	Exon 2 of 12	NP_004553.2
	PRKN	NM_013987.3		c.136G>T	p.Ala46Ser	missense	Exon 2 of 11	NP_054642.2
	PRKN	NM_013988.3		c.136G>T	p.Ala46Ser	missense	Exon 2 of 9	NP_054643.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PRKN	ENST00000366898.6	TSL:1 MANE Select	c.136G>T	p.Ala46Ser	missense	Exon 2 of 12	ENSP00000355865.1
	PRKN	ENST00000366897.5	TSL:1	c.136G>T	p.Ala46Ser	missense	Exon 2 of 11	ENSP00000355863.1
	PRKN	ENST00000366896.5	TSL:1	c.136G>T	p.Ala46Ser	missense	Exon 2 of 9	ENSP00000355862.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251364 AF XY: 0.00000736

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000544

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1460782 Hom.: 0 Cov.: 33 AF XY: 0.00000275 AC XY: 2 AN XY: 726688

African (AFR) AF: 0.0000299 AC: 1 AN: 33444

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86210

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4858

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1112000

Other (OTH) AF: 0.0000332 AC: 2 AN: 60292

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Oct 18, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 46 of the PRKN protein (p.Ala46Ser). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with probable dementia with Lewy bodies (PMID: 22118943). ClinVar contains an entry for this variant (Variation ID: 958287). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed for this missense variant. However, the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on PRKN protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.33
BayesDel_addAF	Uncertain	0.16	D
BayesDel_noAF	Uncertain	-0.010
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.47	T
Eigen	Pathogenic	0.73
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Uncertain	0.83	D
LIST_S2	Uncertain	0.90	D
M_CAP	Uncertain	0.10	D
MetaRNN	Pathogenic	0.82	D
MetaSVM	Uncertain	-0.19	T
PhyloP100		4.3
PrimateAI	Uncertain	0.51	T
PROVEAN	Uncertain	-2.4	N
REVEL	Uncertain	0.51
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.041	D
Polyphen		1.0	D
Vest4		0.72
MutPred		0.71		Gain of sheet (P = 0.0827)
MVP		0.95
MPC		0.35
ClinPred		0.99	D
GERP RS		5.6
Varity_R		0.55
gMVP		0.47
Mutation Taster		=60/40	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs75860381; hg19: chr6-162864377;