NM_000912.5:c.723C>G

Variant names:

• chr8-53229717-G-C
• NM_000912.5:c.723C>G

Variant summary

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

The NM_000912.5(OPRK1):​c.723C>G​(p.Ile241Met) 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: 32)
• Consequence: OPRK1 NM_000912.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.21

Genes affected

OPRK1 (HGNC:8154): (opioid receptor kappa 1) This gene encodes an opioid receptor, which is a member of the 7 transmembrane-spanning G protein-coupled receptor family. It functions as a receptor for endogenous ligands, as well as a receptor for various synthetic opioids. Ligand binding results in inhibition of adenylate cyclase activity and neurotransmitter release. This opioid receptor plays a role in the perception of pain and mediating the hypolocomotor, analgesic and aversive actions of synthetic opioids. Variations in this gene have also been associated with alcohol dependence and opiate addiction. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. A recent study provided evidence for translational readthrough in this gene, and expression of an additional C-terminally extended isoform via the use of an alternative in-frame translation termination codon. [provided by RefSeq, Dec 2017]

LOC105375836 (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, 0.821

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OPRK1	NM_000912.5	c.723C>G	p.Ile241Met	missense_variant	Exon 4 of 4	ENST00000265572.8	NP_000903.2
OPRK1	NM_001318497.2	c.723C>G	p.Ile241Met	missense_variant	Exon 4 of 4		NP_001305426.1
OPRK1	NM_001282904.2	c.456C>G	p.Ile152Met	missense_variant	Exon 5 of 5		NP_001269833.1
LOC105375836	NR_188096.1	n.2429G>C		non_coding_transcript_exon_variant	Exon 3 of 3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OPRK1	ENST00000265572.8	c.723C>G	p.Ile241Met	missense_variant	Exon 4 of 4	1	NM_000912.5	ENSP00000265572.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jul 27, 2021

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.723C>G (p.I241M) alteration is located in exon 4 (coding exon 3) of the OPRK1 gene. This alteration results from a C to G substitution at nucleotide position 723, causing the isoleucine (I) at amino acid position 241 to be replaced by a methionine (M). 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	Pathogenic	0.18	D
BayesDel_noAF	Uncertain	0.020
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Benign	0.20	.;.;T;.;T
Eigen	Uncertain	0.34
Eigen_PC	Benign	0.17
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Pathogenic	0.98	D;D;.;.;D
M_CAP	Benign	0.034	D
MetaRNN	Pathogenic	0.82	D;D;D;D;D
MetaSVM	Benign	-0.56	T
MutationAssessor	Uncertain	2.6	.;.;M;.;M
PrimateAI	Uncertain	0.65	T
PROVEAN	Benign	-2.1	.;.;N;N;N
REVEL	Uncertain	0.41
Sift	Uncertain	0.0010	.;.;D;D;D
Sift4G	Uncertain	0.0050	D;D;D;D;D
Polyphen		1.0	.;.;D;.;D
Vest4		0.68
MutPred		0.67		.;.;Loss of stability (P = 0.1614);.;Loss of stability (P = 0.1614);
MVP		0.84
MPC		1.0
ClinPred		0.94	D
GERP RS		0.79
Varity_R		0.82
gMVP		0.77

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr8-54142277;