rs121913561

Positions:

chr18-60371529-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 5P and 1B. PP3_StrongPP5BS2_Supporting

The NM_005912.3(MC4R):c.821A>G(p.Asn274Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000867 in 1,614,046 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000089 ( 0 hom. )

Consequence

MC4R
NM_005912.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:2

Conservation

PhyloP100: 8.02

Variant links:

Genes affected

MC4R (HGNC:6932): (melanocortin 4 receptor) The protein encoded by this gene is a membrane-bound receptor and member of the melanocortin receptor family. The encoded protein interacts with adrenocorticotropic and MSH hormones and is mediated by G proteins. This is an intronless gene. Defects in this gene are a cause of autosomal dominant obesity. [provided by RefSeq, Jan 2010]

MC4R links:

ENSG00000285681 (HGNC:):

ENSG00000285681 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.947

PP5

Variant 18-60371529-T-C is Pathogenic according to our data. Variant chr18-60371529-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 14324.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Likely_pathogenic=1}. Variant chr18-60371529-T-C is described in Lovd as [Likely_pathogenic].

BS2

High AC in GnomAdExome4 at 13 AD gene. Variant has AC lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MC4R	NM_005912.3 linkuse as main transcript	c.821A>G	p.Asn274Ser	missense_variant	1/1	ENST00000299766.5	NP_005903.2	P32245

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	UniProt
MC4R	ENST00000299766.5 linkuse as main transcript	c.821A>G	p.Asn274Ser	missense_variant	1/1	6	NM_005912.3	ENSP00000299766.3	P32245
ENSG00000285681	ENST00000650201.1 linkuse as main transcript	n.113+42184T>C		intron_variant
ENSG00000285681	ENST00000658928.1 linkuse as main transcript	n.156+42184T>C		intron_variant

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152170

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000796

AC:

AN:

251348

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135838

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000176

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000889

AC:

AN:

1461876

Hom.:

Cov.:

AF XY:

0.00000688

AC XY:

AN XY:

727242

show subpopulations

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:

0.00000989

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152170

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74338

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000378

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

BODY MASS INDEX QUANTITATIVE TRAIT LOCUS 20

Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jul 01, 2001

- -

not provided

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

CeGaT Center for Human Genetics Tuebingen

Jan 01, 2022

- -

Obesity

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Aug 22, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

MC4R-related disorder

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Dec 08, 2023

The MC4R c.821A>G variant is predicted to result in the amino acid substitution p.Asn274Ser. This variant has been reported in multiple individuals with severe obesity (Mergen et al. 2001. PubMed ID: 11443223; Stutzmann et al. 2008. PubMed ID: 18559663; Reinehr et al. 2009. PubMed ID: 18997677; Yurtcu et al. 2009. PubMed ID: 19184404; Rouskas et al. 2012. PubMed ID: 22447289; Mühlhaus et al. 2012. PubMed ID: 22688572; Aykut et al. 2020. PubMed ID: 32185475); however, it has also been detected at least twice in control cohorts of non-obese individuals (Yurtcu et al. 2009. PubMed ID: 19184404; Rouskas et al. 2012. PubMed ID: 22447289). Moreover, in vitro studies have demonstrated that MC4R protein carrying the p.Asn274Ser variant has normal cell surface expression and ligand binding affinity comparable to wild type protein (Tao et al. 2003. PubMed ID: 12959994; Xiang et al. 2006. PubMed ID: 16752916). Additional experiments also found similar levels of cyclic AMP production and MAPK signaling pathway activation following stimulation by endogenous and synthetic receptor agonists (Tao et al. 2003. PubMed ID: 12959994; Xiang et al. 2006. PubMed ID: 16752916; He et al. 2014. PubMed ID: 25332687). This variant is reported in 0.0018% of alleles in individuals of European (Non-Finnish) descent in gnomAD. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.23

BayesDel_addAF

Benign

-0.058

BayesDel_noAF

Benign

-0.31

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.67

Eigen

Pathogenic

0.78

Eigen_PC

Pathogenic

0.78

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Uncertain

0.95

M_CAP

Uncertain

0.24

MetaRNN

Pathogenic

0.95

MetaSVM

Uncertain

-0.035

MutationAssessor

Uncertain

2.5

PrimateAI

Uncertain

0.72

PROVEAN

Uncertain

-3.3

REVEL

Uncertain

0.56

Sift

Benign

0.064

Sift4G

Benign

0.097

Polyphen

0.98

Vest4

0.91

MutPred

0.82

Gain of glycosylation at N274 (P = 0.0396);

MVP

0.91

MPC

0.10

ClinPred

0.90

GERP RS

5.8

Varity_R

0.28

gMVP

0.92

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over