7-95306305-A-G

Variant names:

• chr7-95306305-A-G
• NM_000446.7:c.760T>C

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_000446.7(PON1):​c.760T>C​(p.Trp254Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PON1 NM_000446.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.49
• Publications: 0 publications found

Genes affected

PON1 (HGNC:9204): (paraoxonase 1) This gene encodes a member of the paraoxonase family of enzymes and exhibits lactonase and ester hydrolase activity. Following synthesis in the kidney and liver, the enzyme is secreted into the circulation, where it binds to high density lipoprotein (HDL) particles and hydrolyzes thiolactones and xenobiotics, including paraoxon, a metabolite of the insecticide parathion. Polymorphisms in this gene may be associated with coronary artery disease and diabetic retinopathy. The gene is found in a cluster of three related paraoxonase genes on chromosome 7. [provided by RefSeq, Aug 2017]

PON1 Gene-Disease associations (from GenCC):

• amyotrophic lateral sclerosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PON1	NM_000446.7	c.760T>C	p.Trp254Arg	missense_variant	Exon 7 of 9	ENST00000222381.8	NP_000437.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PON1	ENST00000222381.8	c.760T>C	p.Trp254Arg	missense_variant	Exon 7 of 9	1	NM_000446.7	ENSP00000222381.3
PON1	ENST00000433729.1	n.*485T>C		non_coding_transcript_exon_variant	Exon 7 of 9	3		ENSP00000407359.1
PON1	ENST00000433729.1	n.*485T>C		3_prime_UTR_variant	Exon 7 of 9	3		ENSP00000407359.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Aug 10, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.760T>C (p.W254R) alteration is located in exon 7 (coding exon 7) of the PON1 gene. This alteration results from a T to C substitution at nucleotide position 760, causing the tryptophan (W) at amino acid position 254 to be replaced by an arginine (R). 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	Benign	0.31
BayesDel_addAF	Benign	-0.089	T
BayesDel_noAF	Benign	-0.36
CADD	Benign	21
DANN	Benign	0.91
DEOGEN2	Benign	0.075	T
Eigen	Benign	-0.023
Eigen_PC	Benign	0.081
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Benign	0.57	T
M_CAP	Benign	0.010	T
MetaRNN	Uncertain	0.60	D
MetaSVM	Benign	-0.92	T
MutationAssessor	Uncertain	2.2	M
PhyloP100		2.5
PrimateAI	Uncertain	0.62	T
PROVEAN	Uncertain	-3.1	D
REVEL	Benign	0.24
Sift	Benign	0.39	T
Sift4G	Benign	0.35	T
Polyphen		0.014	B
Vest4		0.63
MutPred		0.64		Gain of disorder (P = 0.0102);
MVP		0.53
MPC		0.80
ClinPred		0.94	D
GERP RS		3.6
Varity_R		0.32
gMVP		0.69
Mutation Taster		=74/26	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

hg19: chr7-94935617; COSMIC: COSV55933304; COSMIC: COSV55933304;