1-207761327-A-G

Position:

• chr1-207761327-A-G

Variant summary

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

The NM_172351.3(CD46):​c.554A>G​(p.Asp185Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,460,516 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D185N) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: CD46 NM_172351.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.27

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]

MIR29B2CHG (HGNC:32018): (MIR29B2 and MIR29C host gene)

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.554A>G	p.Asp185Gly	missense_variant	5/13	ENST00000367042.6	NP_758861.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CD46	ENST00000367042.6	c.554A>G	p.Asp185Gly	missense_variant	5/13	1	NM_172351.3	ENSP00000356009.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000796 AC: 2 AN: 251394 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135880

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

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: 0.00000879

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1460516 Hom.: 0 Cov.: 30 AF XY: 0.00000275 AC XY: 2 AN XY: 726706

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

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: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ExAC AF: 0.0000165 AC: 2

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

Oct 09, 2024

This sequence change replaces aspartic acid, which is acidic and polar, with glycine, which is neutral and non-polar, at codon 185 of the CD46 protein (p.Asp185Gly). This variant is present in population databases (rs747504551, gnomAD 0.003%). This variant has not been reported in the literature in individuals affected with CD46-related conditions. ClinVar contains an entry for this variant (Variation ID: 1507325). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt CD46 protein function with a negative predictive value of 80%. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.56
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	20
DANN	Uncertain	1.0
DEOGEN2	Benign	0.40	T;.;.;.;.;.;.;.;.;.
Eigen	Benign	-0.42
Eigen_PC	Benign	-0.56
FATHMM_MKL	Benign	0.12	N
LIST_S2	Benign	0.84	T;T;D;D;D;D;T;D;D;T
M_CAP	Uncertain	0.098	D
MetaRNN	Uncertain	0.44	T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.68	T
MutationAssessor	Benign	1.9	L;L;L;L;L;L;L;.;L;L
PrimateAI	Benign	0.40	T
PROVEAN	Uncertain	-3.4	D;D;D;D;D;D;D;D;D;D
REVEL	Benign	0.19
Sift	Uncertain	0.0050	D;D;D;D;D;D;D;D;D;D
Sift4G	Uncertain	0.013	D;D;T;T;T;T;D;D;T;D
Polyphen		0.99	D;P;P;P;D;P;P;.;P;D
Vest4		0.38
MutPred		0.57		Loss of stability (P = 0.0736);Loss of stability (P = 0.0736);Loss of stability (P = 0.0736);Loss of stability (P = 0.0736);Loss of stability (P = 0.0736);Loss of stability (P = 0.0736);Loss of stability (P = 0.0736);.;Loss of stability (P = 0.0736);Loss of stability (P = 0.0736);
MVP		0.73
MPC		0.47
ClinPred		0.85	D
GERP RS		3.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.43
gMVP		0.62

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

Other links and lift over

dbSNP: rs747504551; hg19: chr1-207934672; COSMIC: COSV100522868; COSMIC: COSV100522868;