1-207752285-G-A

Variant names:

• chr1-207752285-G-A
• rs752439575
• NM_172351.3:c.73G>A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_172351.3(CD46):​c.73G>A​(p.Val25Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. 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: -0.0430

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.1546031).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CD46	NM_172351.3	c.73G>A	p.Val25Met	missense_variant	Exon 1 of 13	ENST00000367042.6	NP_758861.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CD46	ENST00000367042.6	c.73G>A	p.Val25Met	missense_variant	Exon 1 of 13	1	NM_172351.3	ENSP00000356009.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Aug 04, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.73G>A (p.V25M) alteration is located in exon 1 (coding exon 1) of the CD46 gene. This alteration results from a G to A substitution at nucleotide position 73, causing the valine (V) at amino acid position 25 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.22
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.50
CADD	Benign	17
DANN	Uncertain	1.0
DEOGEN2	Benign	0.33	T;.;.;.;.;.;.;.;.;.
Eigen	Benign	-0.34
Eigen_PC	Benign	-0.59
FATHMM_MKL	Benign	0.12	N
LIST_S2	Uncertain	0.89	D;D;D;D;D;D;D;T;D;D
M_CAP	Benign	0.022	T
MetaRNN	Benign	0.15	T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.8	L;L;L;L;L;L;L;L;L;L
PrimateAI	Benign	0.35	T
PROVEAN	Benign	-1.4	N;N;N;N;N;N;N;N;N;N
REVEL	Benign	0.053
Sift	Uncertain	0.0040	D;D;D;D;D;D;D;D;D;D
Sift4G	Uncertain	0.0050	D;D;D;D;D;D;D;D;D;D
Polyphen		1.0	D;D;D;D;D;D;D;.;D;D
Vest4		0.12
MutPred		0.51		Gain of disorder (P = 0.0272);Gain of disorder (P = 0.0272);Gain of disorder (P = 0.0272);Gain of disorder (P = 0.0272);Gain of disorder (P = 0.0272);Gain of disorder (P = 0.0272);Gain of disorder (P = 0.0272);Gain of disorder (P = 0.0272);Gain of disorder (P = 0.0272);Gain of disorder (P = 0.0272);
MVP		0.36
MPC		0.49
ClinPred		0.42	T
GERP RS		1.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.066
gMVP		0.35

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: rs752439575; hg19: chr1-207925630;