chr18-60371403-A-C

Position:

chr18-60371403-A-C

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM1PP3_ModeratePP5_Very_Strong

The NM_005912.3(MC4R):c.947T>G(p.Ile316Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000155 in 1,614,072 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 Likely pathogenic (★★).

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000016 ( 0 hom. )

Consequence

MC4R
NM_005912.3 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5

Conservation

PhyloP100: 8.95

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:

(HGNC:):

links:

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 12 ACMG points.

PM1

In a topological_domain Cytoplasmic (size 27) in uniprot entity MC4R_HUMAN there are 7 pathogenic changes around while only 0 benign (100%) in NM_005912.3

PP3

MetaRNN computational evidence supports a deleterious effect, 0.938

PP5

Variant 18-60371403-A-C is Pathogenic according to our data. Variant chr18-60371403-A-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 14331.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr18-60371403-A-C is described in Lovd as [Pathogenic]. Variant chr18-60371403-A-C is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MC4R	NM_005912.3 linkuse as main transcript	c.947T>G	p.Ile316Ser	missense_variant	1/1	ENST00000299766.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Appris
MC4R	ENST00000299766.5 linkuse as main transcript	c.947T>G	p.Ile316Ser	missense_variant	1/1	NM_005912.3	P1
	ENST00000658928.1 linkuse as main transcript	n.156+42058A>C		intron_variant, non_coding_transcript_variant
	ENST00000650201.1 linkuse as main transcript	n.113+42058A>C		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152190

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:

0.000414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000199

AC:

AN:

251428

Hom.:

AF XY:

0.0000294

AC XY:

AN XY:

135886

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:

0.000163

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000157

AC:

AN:

1461882

Hom.:

Cov.:

AF XY:

0.0000193

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:

0.000255

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152190

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74366

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:

0.000414

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ExAC

AF:

0.0000494

AC:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

BODY MASS INDEX QUANTITATIVE TRAIT LOCUS 20

Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Nov 17, 2021	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Mar 20, 2003	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Dec 23, 2021	- -

Obesity due to melanocortin 4 receptor deficiency

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Feb 24, 2022

proposed classification - variant undergoing re-assessment, contact laboratory -

Obesity

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 28, 2017

The MC4R c.947T>G (p.Ile316Ser) variant has been reported in three studies in which it is found in a total of eight obese individuals from three families (Farooqi et al. 2003; Saeed et al. 2012; Saeed et al. 2015). The variant was identified in a homozygous state in three affected individuals, including a sibling pair, from a consanguineous family and in another unrelated individual. Another family, in which the variant segregated with disease, included one affected homozygote and three affected heterozygotes who were less obese than the homozygote. The p.Ile316Ser variant was absent from 80 controls but is reported at a frequency of 0.00036 in the South Asian population of the Exome Aggregation Consortium. Functional studies conducted in cell lines demonstrated that the p.Ile316Ser variant results in partial loss of function and a 14-fold decrease in binding affinity for MSH analog as compared to wild type protein. Furthermore, the p.Ile316Ser protein was less abundant in the plasma membrane and localized in the endoplasmic reticulum as a ubiquitinated protein (Farooqi et al. 2003; Yeo et al. 2003; Granell et al. 2010). Based on the collective evidence, the p.Ile316Ser variant is classified as likely pathogenic for obesity. This variant was observed by ICSL as part of a predisposition screen in an ostensibly healthy population. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.73

BayesDel_addAF

Uncertain

0.093

BayesDel_noAF

Pathogenic

0.16

CADD

Pathogenic

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.73

Eigen

Pathogenic

0.84

Eigen_PC

Pathogenic

0.85

FATHMM_MKL

Pathogenic

1.0

LIST_S2

Uncertain

0.95

M_CAP

Uncertain

0.16

MetaRNN

Pathogenic

0.94

MetaSVM

Benign

-0.63

MutationAssessor

Uncertain

2.4

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.65

PROVEAN

Uncertain

-3.8

REVEL

Pathogenic

0.67

Sift

Pathogenic

0.0

Sift4G

Uncertain

0.0030

Polyphen

0.99

Vest4

0.99

MutPred

0.78

Gain of disorder (P = 0.0157);

MVP

0.89

MPC

0.027

ClinPred

0.90

GERP RS

6.1

Varity_R

0.76

gMVP

0.97

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