6-31936016-G-A

Position:

• chr6-31936016-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_000063.6(C2):​c.943G>A​(p.Asp315Asn) 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. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: C2 NM_000063.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.85

Genes affected

C2 (HGNC:1248): (complement C2) Component C2 is a serum glycoprotein that functions as part of the classical pathway of the complement system. Activated C1 cleaves C2 into C2a and C2b. The serine proteinase C2a then combines with complement factor 4b to create the C3 or C5 convertase. Deficiency of C2 has been reported to associated with certain autoimmune diseases and SNPs in this gene have been associated with altered susceptibility to age-related macular degeneration. This gene localizes within the class III region of the MHC on the short arm of chromosome 6. Alternative splicing results in multiple transcript variants encoding distinct isoforms. Additional transcript variants have been described in publications but their full-length sequence has not been determined.[provided by RefSeq, Mar 2009]

C2-AS1 (HGNC:49464): (C2 antisense RNA 1)

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.36680558).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
C2	NM_000063.6	c.943G>A	p.Asp315Asn	missense_variant	7/18	ENST00000299367.10	NP_000054.2
C2-AS1	NR_104191.1	n.541-614C>T		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
C2	ENST00000299367.10	c.943G>A	p.Asp315Asn	missense_variant	7/18	1	NM_000063.6	ENSP00000299367	P1
C2-AS1	ENST00000630806.1	n.541-614C>T		intron_variant, non_coding_transcript_variant		2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

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

Jul 19, 2022

This sequence change replaces aspartic acid, which is acidic and polar, with asparagine, which is neutral and polar, at codon 315 of the C2 protein (p.Asp315Asn). 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: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C15"). This variant has not been reported in the literature in individuals affected with C2-related conditions. This variant is not present in population databases (gnomAD no frequency). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.095
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.49
CADD	Benign	18
DANN	Benign	0.92
DEOGEN2	Benign	0.070	T;.;T;.
Eigen	Benign	-0.34
Eigen_PC	Benign	-0.25
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.79	T;T;T;T
M_CAP	Uncertain	0.28	D
MetaRNN	Benign	0.37	T;T;T;T
MetaSVM	Benign	-0.83	T
MutationAssessor	Benign	1.2	.;.;L;.
MutationTaster	Benign	1.0	D;D;D;D;D
PROVEAN	Benign	-1.0	N;N;N;N
REVEL	Benign	0.27
Sift	Benign	0.26	T;T;T;T
Sift4G	Benign	0.38	T;T;T;T
Polyphen		0.0020	B;B;B;.
Vest4		0.11
MutPred		0.51		.;.;Loss of stability (P = 0.1745);.;
MVP		0.74
MPC		0.35
ClinPred		0.47	T
GERP RS		5.5
Varity_R		0.31
gMVP		0.40

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr6-31903793; COSMIC: COSV105164407; COSMIC: COSV105164407;