19-50856357-T-G

Position:

• chr19-50856357-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001648.2(KLK3):​c.164T>G​(p.Val55Gly) 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 Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: KLK3 NM_001648.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.93

Genes affected

KLK3 (HGNC:6364): (kallikrein related peptidase 3) Kallikreins are a subgroup of serine proteases having diverse physiological functions. Growing evidence suggests that many kallikreins are implicated in carcinogenesis and some have potential as novel cancer and other disease biomarkers. The gene is one of the fifteen kallikrein subfamily members located in a cluster on chromosome 19. It encodes a single-chain glycoprotein, a protease which is synthesized in the epithelial cells of the prostate gland, and is present in seminal plasma. It is thought to function normally in the liquefaction of seminal coagulum, presumably by hydrolysis of the high molecular mass seminal vesicle protein. The serum level of this protein, called PSA in the clinical setting, is useful in the diagnosis and monitoring of prostatic carcinoma. Alternate splicing of this gene generates several transcript variants encoding different isoforms. [provided by RefSeq, Dec 2019]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.918

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KLK3	NM_001648.2	c.164T>G	p.Val55Gly	missense_variant	2/5	ENST00000326003.7	NP_001639.1
KLK3	NM_001030047.1	c.164T>G	p.Val55Gly	missense_variant	2/5		NP_001025218.1
KLK3	NM_001030048.1	c.164T>G	p.Val55Gly	missense_variant	2/5		NP_001025219.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KLK3	ENST00000326003.7	c.164T>G	p.Val55Gly	missense_variant	2/5	1	NM_001648.2	ENSP00000314151	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 06, 2023

The c.164T>G (p.V55G) alteration is located in exon 2 (coding exon 2) of the KLK3 gene. This alteration results from a T to G substitution at nucleotide position 164, causing the valine (V) at amino acid position 55 to be replaced by a glycine (G). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.89
BayesDel_addAF	Uncertain	0.075	D
BayesDel_noAF	Benign	-0.13
CADD	Uncertain	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.73	.;D;.;D;D;.;.;.
Eigen	Uncertain	0.27
Eigen_PC	Benign	0.080
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.85	D;T;D;D;D;D;D;D
M_CAP	Benign	0.021	T
MetaRNN	Pathogenic	0.92	D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.37	T
MutationAssessor	Uncertain	2.3	.;M;.;.;.;M;M;M
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Benign	0.39	T
PROVEAN	Pathogenic	-5.7	.;D;.;.;.;.;.;D
REVEL	Uncertain	0.31
Sift	Uncertain	0.0010	.;D;.;.;.;.;.;D
Sift4G	Pathogenic	0.0010	D;D;D;D;D;D;D;D
Polyphen		1.0	.;.;D;.;.;.;.;.
Vest4		0.55, 0.59, 0.62, 0.55, 0.58, 0.57
MutPred		0.82		.;Loss of stability (P = 0.0351);Loss of stability (P = 0.0351);.;Loss of stability (P = 0.0351);Loss of stability (P = 0.0351);Loss of stability (P = 0.0351);Loss of stability (P = 0.0351);
MVP		0.65
MPC		0.50
ClinPred		0.98	D
GERP RS		2.9
Varity_R		0.90
gMVP		0.74

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.090		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: chr19-51359613;