18-60371970-G-C

Variant names:

• chr18-60371970-G-C
• rs13447331
• NM_005912.3:c.380C>G

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PM1 PM2 PM5 PP2 PP3_Moderate

The NM_005912.3(MC4R):​c.380C>G​(p.Ser127Trp) 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S127L) has been classified as Likely pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: MC4R NM_005912.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 10.0
• Publications: 50 publications found

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 Gene-Disease associations (from GenCC):

• inherited obesity

  Inheritance: AD Classification: STRONG Submitted by: Laboratory for Molecular Medicine
• obesity due to melanocortin 4 receptor deficiency

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000285681 (HGNC:):

ACMG classification

Our verdict: Likely_pathogenic. The variant received 9 ACMG points.

• PM1: In a transmembrane_region Helical; Name=3 (size 21) in uniprot entity MC4R_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_005912.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr18-60371970-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 14336.
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 29 curated pathogenic missense variants (we use a threshold of 10). The gene has 3 curated benign missense variants. Gene score misZ: -1.0099 (below the threshold of 3.09). Trascript score misZ: 0.30396 (below the threshold of 3.09). GenCC associations: The gene is linked to obesity due to melanocortin 4 receptor deficiency, inherited obesity.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.915

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MC4R	NM_005912.3	c.380C>G	p.Ser127Trp	missense_variant	Exon 1 of 1	ENST00000299766.5	NP_005903.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MC4R	ENST00000299766.5	c.380C>G	p.Ser127Trp	missense_variant	Exon 1 of 1	6	NM_005912.3	ENSP00000299766.3
ENSG00000285681	ENST00000650201.1	n.113+42625G>C		intron_variant	Intron 1 of 3
ENSG00000285681	ENST00000658928.1	n.156+42625G>C		intron_variant	Intron 1 of 3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.88
BayesDel_addAF	Pathogenic	0.29	D
BayesDel_noAF	Pathogenic	0.17
CADD	Pathogenic	31
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.74	D
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.99
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.93	D
M_CAP	Pathogenic	0.31	D
MetaRNN	Pathogenic	0.91	D
MetaSVM	Uncertain	-0.18	T
MutationAssessor	Pathogenic	3.5	H
PhyloP100		10
PrimateAI	Pathogenic	0.82	D
PROVEAN	Uncertain	-4.0	D
REVEL	Uncertain	0.58
Sift	Uncertain	0.0040	D
Sift4G	Benign	0.096	T
Vest4		0.88
ClinPred		1.0	D
GERP RS		5.7
Varity_R		0.70
gMVP		0.95
Mutation Taster		=15/85	disease causing

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

dbSNP: rs13447331; hg19: chr18-58039203;