rs121907950

Positions:

• chr11-57614472-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1 PM2 PP3_Moderate

The NM_000062.3(SERPING1):​c.1394C>T​(p.Ala465Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,778 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. A465A) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: SERPING1 NM_000062.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter P:1 U:1
• Conservation: PhyloP100: 3.36

Genes affected

SERPING1 (HGNC:1228): (serpin family G member 1) This gene encodes a highly glycosylated plasma protein involved in the regulation of the complement cascade. Its encoded protein, C1 inhibitor, inhibits activated C1r and C1s of the first complement component and thus regulates complement activation. It is synthesized in the liver, and its deficiency is associated with hereditary angioneurotic oedema (HANE). Alternative splicing results in multiple transcript variants encoding the same isoform. [provided by RefSeq, May 2020]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM1: In a hotspot region, there are 8 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 6 uncertain in NM_000062.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.885

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SERPING1	NM_000062.3	c.1394C>T	p.Ala465Val	missense_variant	8/8	ENST00000278407.9
SERPING1	NM_001032295.2	c.1394C>T	p.Ala465Val	missense_variant	7/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SERPING1	ENST00000278407.9	c.1394C>T	p.Ala465Val	missense_variant	8/8	1	NM_000062.3	P2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461778 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727206

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000188

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Complement component 4, partial deficiency of, due to dysfunctional c1 inhibitor Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Mar 01, 1995

- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 15, 2023

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. Experimental studies have shown that this missense change affects SERPING1 function (PMID: 7883978). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on SERPING1 protein function. ClinVar contains an entry for this variant (Variation ID: 3955). This variant is also known as p.Ala443Val. This missense change has been observed in individual(s) with incomplete C4 deficiency (PMID: 6480834, 7883978). This variant is not present in population databases (gnomAD no frequency). This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 465 of the SERPING1 protein (p.Ala465Val). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.57
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.070
CADD	Benign	22
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.63	D;.;.;.;T
Eigen	Benign	-0.13
Eigen_PC	Benign	-0.083
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Benign	0.82	T;T;T;T;T
M_CAP	Uncertain	0.19	D
MetaRNN	Pathogenic	0.88	D;D;D;D;D
MetaSVM	Uncertain	-0.27	T
MutationAssessor	Uncertain	2.1	M;.;.;.;.
MutationTaster	Benign	0.23	A;A;A;A;A
PrimateAI	Benign	0.48	T
PROVEAN	Uncertain	-3.2	D;D;D;D;D
REVEL	Uncertain	0.64
Sift	Uncertain	0.0060	D;D;D;D;D
Sift4G	Uncertain	0.010	D;D;D;D;D
Polyphen		0.40	B;.;.;.;.
Vest4		0.53
MutPred		0.64		.;.;Gain of sheet (P = 0.0827);.;.;
MVP		0.98
MPC		0.99
ClinPred		0.98	D
GERP RS		3.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.65
gMVP		0.93

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: rs121907950; hg19: chr11-57381945;