1-207752264-G-A

Position:

• chr1-207752264-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_172351.3(CD46):​c.52G>A​(p.Gly18Arg) 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: CD46 NM_172351.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.06

Genes affected

CD46 (HGNC:6953): (CD46 molecule) The protein encoded by this gene is a type I membrane protein and is a regulatory part of the complement system. The encoded protein has cofactor activity for inactivation of complement components C3b and C4b by serum factor I, which protects the host cell from damage by complement. In addition, the encoded protein can act as a receptor for the Edmonston strain of measles virus, human herpesvirus-6, and type IV pili of pathogenic Neisseria. Finally, the protein encoded by this gene may be involved in the fusion of the spermatozoa with the oocyte during fertilization. Mutations at this locus have been associated with susceptibility to hemolytic uremic syndrome. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jun 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

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

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CD46	NM_172351.3	c.52G>A	p.Gly18Arg	missense_variant	1/13	ENST00000367042.6	NP_758861.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CD46	ENST00000367042.6	c.52G>A	p.Gly18Arg	missense_variant	1/13	1	NM_172351.3	ENSP00000356009	A2

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 provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 15, 2022

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals affected with CD46-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 18 of the CD46 protein (p.Gly18Arg). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.52
BayesDel_addAF	Benign	-0.020	T
BayesDel_noAF	Benign	-0.27
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.55	D;.;.;.;.;.;.;.;.;.
Eigen	Benign	-0.13
Eigen_PC	Benign	-0.40
FATHMM_MKL	Benign	0.25	N
LIST_S2	Uncertain	0.89	D;D;D;D;D;D;D;T;D;D
M_CAP	Benign	0.050	D
MetaRNN	Uncertain	0.70	D;D;D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.94	T
MutationAssessor	Benign	1.9	L;L;L;L;L;L;L;L;L;L
MutationTaster	Benign	1.0	N;N;N;N;N;N;N;N;N;N;N;N
PrimateAI	Benign	0.39	T
PROVEAN	Uncertain	-3.2	D;D;D;D;D;D;D;N;D;D
REVEL	Benign	0.21
Sift	Uncertain	0.025	D;D;D;D;D;D;D;D;D;D
Sift4G	Uncertain	0.054	T;T;T;T;T;T;T;D;T;T
Polyphen		1.0	D;D;D;D;D;D;D;.;D;D
Vest4		0.63
MutPred		0.64		Loss of catalytic residue at G18 (P = 0.0221);Loss of catalytic residue at G18 (P = 0.0221);Loss of catalytic residue at G18 (P = 0.0221);Loss of catalytic residue at G18 (P = 0.0221);Loss of catalytic residue at G18 (P = 0.0221);Loss of catalytic residue at G18 (P = 0.0221);Loss of catalytic residue at G18 (P = 0.0221);Loss of catalytic residue at G18 (P = 0.0221);Loss of catalytic residue at G18 (P = 0.0221);Loss of catalytic residue at G18 (P = 0.0221);
MVP		0.61
MPC		0.71
ClinPred		0.89	D
GERP RS		2.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.13
gMVP		0.65

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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

Other links and lift over

dbSNP: rs760165779; hg19: chr1-207925609;