1-22644123-G-A

Position:

chr1-22644123-G-A

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2PP3_StrongPP5_Very_Strong

The NM_172369.5(C1QC):c.100G>A(p.Gly34Arg) variant causes a missense change. The variant allele was found at a frequency of 0.0000821 in 1,582,968 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 Pathogenic (★★).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000086 ( 0 hom. )

Consequence

C1QC
NM_172369.5 missense

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:4

Conservation

PhyloP100: 3.96

Variant links:

Genes affected

C1QC (HGNC:1245): (complement C1q C chain) This gene encodes the C-chain polypeptide of serum complement subcomponent C1q, which associates with C1r and C1s to yield the first component of the serum complement system. C1q is composed of 18 polypeptide chains which include 6 A-chains, 6 B-chains, and 6 C-chains. Each chain contains an N-terminal collagen-like region and a C-terminal C1q globular domain. C1q deficiency is associated with lupus erythematosus and glomerulonephritis. [provided by RefSeq, Dec 2016]

C1QC links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 14 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.941

PP5

Variant 1-22644123-G-A is Pathogenic according to our data. Variant chr1-22644123-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 17071.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-22644123-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
C1QC	NM_172369.5 linkuse as main transcript	c.100G>A	p.Gly34Arg	missense_variant	2/3	ENST00000374640.9	NP_758957.2
C1QC	NM_001114101.3 linkuse as main transcript	c.100G>A	p.Gly34Arg	missense_variant	2/3		NP_001107573.1
C1QC	NM_001347619.2 linkuse as main transcript	c.100G>A	p.Gly34Arg	missense_variant	2/3		NP_001334548.1
C1QC	NM_001347620.2 linkuse as main transcript	c.-87+409G>A		intron_variant			NP_001334549.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
C1QC	ENST00000374640.9 linkuse as main transcript	c.100G>A	p.Gly34Arg	missense_variant	2/3	1	NM_172369.5	ENSP00000363771	P1

Frequencies

GnomAD3 genomes

AF:

0.0000460

AC:

AN:

152192

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000882

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000128

AC:

AN:

195704

Hom.:

AF XY:

0.000181

AC XY:

AN XY:

104702

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.000113

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000400

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000245

Gnomad OTH exome

AF:

0.000398

GnomAD4 exome

AF:

0.0000860

AC:

123

AN:

1430776

Hom.:

Cov.:

AF XY:

0.000102

AC XY:

AN XY:

708358

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000259

Gnomad4 ASJ exome

AF:

0.0000394

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000369

Gnomad4 FIN exome

AF:

0.0000197

Gnomad4 NFE exome

AF:

0.000102

Gnomad4 OTH exome

AF:

0.0000674

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152192

Hom.:

Cov.:

AF XY:

0.0000673

AC XY:

AN XY:

74348

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.000288

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000882

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000134

Hom.:

Bravo

AF:

0.0000604

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000117

AC:

ExAC

AF:

0.000167

AC:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 09, 2024	This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 34 of the C1QC protein (p.Gly34Arg). This variant is present in population databases (rs200206736, gnomAD 0.03%). This missense change has been observed in individual(s) with classical pathway complement deficiencies (PMID: 7900940, 8630118, 28082982, 30008451, 31357913). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. This variant is also known as p.Gly6Arg. ClinVar contains an entry for this variant (Variation ID: 17071). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Apr 01, 2020	- -

C1Q deficiency

Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Mendelics	May 04, 2022	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Apr 01, 1996	- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.65

BayesDel_addAF

Pathogenic

0.27

BayesDel_noAF

Pathogenic

0.45

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.62

D;D;D

Eigen

Pathogenic

0.85

Eigen_PC

Pathogenic

0.79

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.86

.;.;D

M_CAP

Pathogenic

0.71

MetaRNN

Pathogenic

0.94

D;D;D

MetaSVM

Pathogenic

1.0

MutationAssessor

Pathogenic

3.6

H;H;H

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.76

PROVEAN

Pathogenic

-4.4

D;D;D

REVEL

Pathogenic

0.95

Sift

Uncertain

0.0030

D;D;D

Sift4G

Uncertain

0.0020

D;D;D

Polyphen

0.99

D;D;D

Vest4

0.80

MutPred

0.60

Gain of methylation at G34 (P = 0.052);Gain of methylation at G34 (P = 0.052);Gain of methylation at G34 (P = 0.052);

MVP

0.97

MPC

1.2

ClinPred

0.89

GERP RS

5.3

Varity_R

0.53

gMVP

0.90

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

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