NM_174936.4:c.175G>A

Variant names:

• chr1-55040012-G-A
• rs1060500657
• NM_174936.4:c.175G>A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_174936.4(PCSK9):​c.175G>A​(p.Gly59Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000014 in 1,423,754 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign 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. G59A) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: PCSK9 NM_174936.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.05

Genes affected

PCSK9 (HGNC:20001): (proprotein convertase subtilisin/kexin type 9) This gene encodes a member of the subtilisin-like proprotein convertase family, which includes proteases that process protein and peptide precursors trafficking through regulated or constitutive branches of the secretory pathway. The encoded protein undergoes an autocatalytic processing event with its prosegment in the ER and is constitutively secreted as an inactive protease into the extracellular matrix and trans-Golgi network. It is expressed in liver, intestine and kidney tissues and escorts specific receptors for lysosomal degradation. It plays a role in cholesterol and fatty acid metabolism. Mutations in this gene have been associated with autosomal dominant familial hypercholesterolemia. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.07047495).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PCSK9	NM_174936.4	c.175G>A	p.Gly59Arg	missense_variant	Exon 1 of 12	ENST00000302118.5	NP_777596.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PCSK9	ENST00000302118.5	c.175G>A	p.Gly59Arg	missense_variant	Exon 1 of 12	1	NM_174936.4	ENSP00000303208.5
PCSK9	ENST00000710286.1	c.532G>A	p.Gly178Arg	missense_variant	Exon 1 of 12			ENSP00000518176.1
PCSK9	ENST00000673726.1	n.175G>A		non_coding_transcript_exon_variant	Exon 1 of 6			ENSP00000501004.1
PCSK9	ENST00000673913.2	n.175G>A		non_coding_transcript_exon_variant	Exon 1 of 12			ENSP00000501161.2

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 0.00000140 AC: 2 AN: 1423754 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 704824

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000183

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hypercholesterolemia, autosomal dominant, 3 Uncertain:1

Apr 29, 2016

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glycine with arginine at codon 59 of the PCSK9 protein (p.Gly59Arg). The glycine residue is weakly conserved and there is a moderate physicochemical difference between glycine and arginine. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies. In summary, this variant is a rare missense change that is not predicted to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a PCSK9-related disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.079
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.45
CADD	Benign	6.7
DANN	Benign	0.96
DEOGEN2	Benign	0.061	T
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.26	N
LIST_S2	Benign	0.48	T
M_CAP	Benign	0.023	T
MetaRNN	Benign	0.070	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.34	N
PrimateAI	Benign	0.46	T
PROVEAN	Benign	-0.12	N
REVEL	Benign	0.034
Sift	Benign	0.44	T
Sift4G	Benign	0.57	T
Polyphen		0.0080	B
Vest4		0.16
MutPred		0.38		Loss of catalytic residue at G59 (P = 0.0124);
MVP		0.59
MPC		0.27
ClinPred		0.046	T
GERP RS		1.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.059
gMVP		0.66

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: rs1060500657; hg19: chr1-55505685;