7-95407027-A-C

Position:

• chr7-95407027-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_000305.3(PON2):​c.737T>G​(p.Val246Gly) variant causes a missense change involving the alteration of a 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: 33)
• Consequence: PON2 NM_000305.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.71

Genes affected

PON2 (HGNC:9205): (paraoxonase 2) This gene encodes a member of the paraoxonase gene family, which includes three known members located adjacent to each other on the long arm of chromosome 7. The encoded protein is ubiquitously expressed in human tissues, membrane-bound, and may act as a cellular antioxidant, protecting cells from oxidative stress. Hydrolytic activity against acylhomoserine lactones, important bacterial quorum-sensing mediators, suggests the encoded protein may also play a role in defense responses to pathogenic bacteria. Mutations in this gene may be associated with vascular disease and a number of quantitative phenotypes related to diabetes. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jul 2008]

LOC107986822 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.769

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PON2	NM_000305.3	c.737T>G	p.Val246Gly	missense_variant	7/9	ENST00000222572.8	NP_000296.2
LOC107986822	XR_007060439.1	n.557+9999A>C		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PON2	ENST00000222572.8	c.737T>G	p.Val246Gly	missense_variant	7/9	1	NM_000305.3	ENSP00000222572	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 33

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

Jun 10, 2024

The c.737T>G (p.V246G) alteration is located in exon 7 (coding exon 7) of the PON2 gene. This alteration results from a T to G substitution at nucleotide position 737, causing the valine (V) at amino acid position 246 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	0.75
BayesDel_addAF	Pathogenic	0.32	D
BayesDel_noAF	Pathogenic	0.22
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Benign	0.40	T;.;T;.
Eigen	Pathogenic	0.74
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.81	T;T;.;T
M_CAP	Uncertain	0.090	D
MetaRNN	Pathogenic	0.77	D;D;D;D
MetaSVM	Benign	-0.29	T
MutationAssessor	Uncertain	2.9	M;.;M;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.58	T
PROVEAN	Pathogenic	-6.5	.;D;D;.
REVEL	Uncertain	0.53
Sift	Pathogenic	0.0	.;D;D;.
Sift4G	Pathogenic	0.0	D;D;D;D
Polyphen		1.0	D;.;D;.
Vest4		0.52
MutPred		0.76		Gain of disorder (P = 0.0196);.;Gain of disorder (P = 0.0196);.;
MVP		0.82
MPC		0.55
ClinPred		1.0	D
GERP RS		3.9
Varity_R		0.95
gMVP		0.89

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		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: rs1809715775; hg19: chr7-95036339;