11-57598094-G-T

Position:

• chr11-57598094-G-T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Moderate PP5_Moderate

The NM_000062.3(SERPING1):​c.-22-155G>T variant causes a intron change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: SERPING1 NM_000062.3 intron
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 3.91

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.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
• PP5: Variant 11-57598094-G-T is Pathogenic according to our data. Variant chr11-57598094-G-T is described in ClinVar as [Pathogenic]. Clinvar id is 870444.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr11-57598094-G-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SERPING1	NM_000062.3	c.-22-155G>T		intron_variant		ENST00000278407.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SERPING1	ENST00000278407.9	c.-22-155G>T		intron_variant		1	NM_000062.3	P2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 443692 Hom.: 0 Cov.: 5 AF XY: 0.00 AC XY: 0 AN XY: 231684

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: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary angioedema type 1 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Department of Immunology and Histocompatibility, University of Thessaly

-

The c.-22-155G > T variant was detected in intron 1 of the SERPING1 gene in two unrelated male C1-INH HAE Type I patients (Vatsiou et al., 2020). Pedigree analysis was performed in one Greek family, in which the c.-22-155G > T variant co-segregated with C1-INH-HAE in all of the 4 analyzed patients, while it was absent from 3 healthy family members. Multiple bioinformatics tools predicted that the variant causes a deleterious effect. Degradation of the mutated allele was demonstrated by the loss of heterozygosity on the cDNA level. It was not detected amongst the 31360 individuals of the Genome Aggregation Database (gnomAD), indicating that it is not a common variant. Taking all the above into account and according to ACMG Guidelines (Criteria: PP1 criterion used as strong evidence, PS3, PS4, PM2, PP3, PP4) the variant is considered pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.24
CADD	Benign	22
DANN	Benign	0.95

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.84		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.84		Position offset: -2

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

Publications

LitVar

Other links and lift over

dbSNP: rs1945307391; hg19: chr11-57365567;