19-6709754-C-T

Position:

chr19-6709754-C-T

Variant summary

Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PM2PM5PP2PP5_Very_Strong

The NM_000064.4(C3):c.1775G>A(p.Arg592Gln) 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 1,461,810 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R592W) has been classified as Likely pathogenic.

Frequency

Genomes: not found (cov: 29)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

C3
NM_000064.4 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:6O:1

Conservation

PhyloP100: 0.524

Variant links:

Genes affected

C3 (HGNC:1318): (complement C3) Complement component C3 plays a central role in the activation of complement system. Its activation is required for both classical and alternative complement activation pathways. The encoded preproprotein is proteolytically processed to generate alpha and beta subunits that form the mature protein, which is then further processed to generate numerous peptide products. The C3a peptide, also known as the C3a anaphylatoxin, modulates inflammation and possesses antimicrobial activity. Mutations in this gene are associated with atypical hemolytic uremic syndrome and age-related macular degeneration in human patients. [provided by RefSeq, Nov 2015]

C3 links:

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 13 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chrnull-null-null-null is described in UniProt as null.

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), C3. . Gene score misZ 2.7489 (greater than the threshold 3.09). Trascript score misZ 4.431 (greater than threshold 3.09). GenCC has associacion of gene with complement component 3 deficiency, C3 glomerulonephritis, atypical hemolytic-uremic syndrome with C3 anomaly.

PP5

Variant 19-6709754-C-T is Pathogenic according to our data. Variant chr19-6709754-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 17060.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
C3	NM_000064.4 linkuse as main transcript	c.1775G>A	p.Arg592Gln	missense_variant	14/41	ENST00000245907.11	NP_000055.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
C3	ENST00000245907.11 linkuse as main transcript	c.1775G>A	p.Arg592Gln	missense_variant	14/41	1	NM_000064.4	ENSP00000245907	P1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1461810

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727212

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

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.:

Bravo

AF:

0.0000113

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:6Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Jan 31, 2022	PM1, PM2, PM5, PS3, PS4 -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Apr 01, 2022	This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 592 of the C3 protein (p.Arg592Gln). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with autosomal dominant C3-related conditions (PMID: 18796626, 19590060, 29566171, 30046676). It has also been observed to segregate with disease in related individuals. This variant is also known as R570Q. ClinVar contains an entry for this variant (Variation ID: 17060). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. Experimental studies have shown that this missense change affects C3 function (PMID: 18796626). For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Dec 10, 2020	Published functional studies demonstrate a damaging effect on binding affinity and decreased co-factor activity (Fremeaux-Bacchi et al., 2008; Schramm et al., 2015); Not observed in large population cohorts (Lek et al., 2016); Identified in one patient in a Chinese cohort with C3 glomerulopathy (Zhao et al., 2018); In silico analysis supports that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 29566171, 19590060, 18796626, 21902819, 19775316, 24161037, 29450785, 25486517, 27013439, 23314101, 30046676, 25608561, 32950058, 21102542) -

Age related macular degeneration 9;C2752037:Atypical hemolytic-uremic syndrome with C3 anomaly;C3151071:Complement component 3 deficiency

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 26, 2021

- -

C3-related disorder

Pathogenic:1

Likely pathogenic, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jul 31, 2024

The C3 c.1775G>A variant is predicted to result in the amino acid substitution p.Arg592Gln. This variant in heterozygous state was associated with atypical haemolytic uraemic syndrome (Reported as R570Q in Fremeaux-Bacchi et al 2008. PubMed ID: 18796626; Schramm et al 2015. PubMed ID: 25608561). Of note, another missense variant (p.Arg592Trp), affecting the same amino acid, was also associated with atypical haemolytic uraemic syndrome (reported as R570W in Fremeaux-Bacchi et al 2008. PubMed ID: 18796626). This variant has not been reported in a large population database, indicating this variant is rare. This variant is interpreted as likely pathogenic. -

Familial Atypical Hemolytic-Uremic Syndrome

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Feb 10, 2022

Variant summary: C3 c.1775G>A (p.Arg592Gln) results in a conservative amino acid change located in the Alpha-2-macroglobulin, bait region domain (IPR011625) of the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant was absent in 251464 control chromosomes. c.1775G>A has been reported in the literature in individuals affected with Genetic Atypical Hemolytic Uremic Syndrome (example, Fremeaux-Bacchi_2008, Fidalgo_2017, Zhao_2018, Bahougne_2020). These data indicate that the variant is likely to be associated with disease. At least one publication reports experimental evidence evaluating an impact on protein function. The most pronounced variant effect results in 22% of WT activity in binding to complement regulators such as membrane coding factor (MCP), resulting in a resistance to cleavage by factor I and a decreased cofactor activity (example, Fremeaux-Bachhi_2008 and reproduced by Schramm_2015). Two clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as pathogenic/likely pathogenic. Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Atypical hemolytic-uremic syndrome with C3 anomaly

Other:1

risk factor, no assertion criteria provided

literature only

OMIM

Dec 15, 2008

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Uncertain

0.072

BayesDel_noAF

Benign

-0.13

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.16

Eigen

Benign

-0.070

Eigen_PC

Benign

-0.14

FATHMM_MKL

Benign

0.12

LIST_S2

Uncertain

0.88

M_CAP

Uncertain

0.12

MetaRNN

Uncertain

0.57

MetaSVM

Benign

-0.89

MutationAssessor

Uncertain

2.7

MutationTaster

Benign

0.99

PrimateAI

Benign

0.40

PROVEAN

Benign

-1.9

REVEL

Uncertain

0.33

Sift

Benign

0.050

Sift4G

Benign

0.21

Polyphen

0.84

Vest4

0.34

MutPred

0.88

Loss of MoRF binding (P = 0.0567);

MVP

0.88

MPC

0.98

ClinPred

0.79

GERP RS

2.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.48

gMVP

0.55

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over