1-22637696-G-A

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4_StrongBS1_Supporting

The NM_015991.4(C1QA):c.80G>A(p.Arg27Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000143 in 1,613,830 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R27G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00015 ( 0 hom. )

Consequence

C1QA
NM_015991.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.318

Publications

4 publications found

Variant links:

Genes affected

C1QA (HGNC:1241): (complement C1q A chain) This gene encodes the A-chain polypeptide of serum complement subcomponent C1q, which associates with C1r and C1s to yield the first component of the serum complement system. C1q deficiency is associated with lupus erythematosus and glomerulonephritis. 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. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Nov 2016]

C1QA Gene-Disease associations (from GenCC):

C1Q deficiency
Inheritance: AR Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics

C1QA links:

ENSG00000289692 (HGNC:):

ENSG00000289692 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.03651592).

BS1

Variant frequency is greater than expected in population sas. GnomAdExome4 allele frequency = 0.000153 (223/1461568) while in subpopulation SAS AF = 0.00104 (90/86172). AF 95% confidence interval is 0.00087. There are 0 homozygotes in GnomAdExome4. There are 135 alleles in the male GnomAdExome4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
C1QA	NM_015991.4 link	c.80G>A	p.Arg27Gln	missense_variant	Exon 2 of 3	ENST00000374642.8	NP_057075.1	P02745A0A024RAG6
C1QA	NM_001347465.2 link	c.80G>A	p.Arg27Gln	missense_variant	Exon 2 of 3		NP_001334394.1	P02745A0A024RAG6
C1QA	NM_001347466.2 link	c.80G>A	p.Arg27Gln	missense_variant	Exon 2 of 3		NP_001334395.1	P02745A0A024RAG6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
C1QA	ENST00000374642.8 link	c.80G>A	p.Arg27Gln	missense_variant	Exon 2 of 3	1	NM_015991.4	ENSP00000363773.3		P02745
ENSG00000289692	ENST00000695747.1 link	c.80G>A	p.Arg27Gln	missense_variant	Exon 2 of 5			ENSP00000512140.1		A0A8Q3SI62

Frequencies

GnomAD3 genomes

AF:

0.0000526

AC:

AN:

152144

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000588

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000168

AC:

AN:

250466

AF XY:

0.000229

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000580

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000930

Gnomad NFE exome

AF:

0.0000883

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000153

AC:

223

AN:

1461568

Hom.:

Cov.:

AF XY:

0.000186

AC XY:

135

AN XY:

727058

show subpopulations

African (AFR)

AF:

0.0000896

AC:

AN:

33472

American (AMR)

AF:

0.0000448

AC:

AN:

44690

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26118

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39696

South Asian (SAS)

AF:

0.00104

AC:

AN:

86172

European-Finnish (FIN)

AF:

0.0000374

AC:

AN:

53410

Middle Eastern (MID)

AF:

0.000526

AC:

AN:

5700

European-Non Finnish (NFE)

AF:

0.000103

AC:

114

AN:

1111922

Other (OTH)

AF:

0.000132

AC:

AN:

60388

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.492

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000525

AC:

AN:

152262

Hom.:

Cov.:

AF XY:

0.0000672

AC XY:

AN XY:

74444

show subpopulations

African (AFR)

AF:

0.0000481

AC:

AN:

41556

American (AMR)

AF:

0.00

AC:

AN:

15300

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5172

South Asian (SAS)

AF:

0.000414

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000588

AC:

AN:

68002

Other (OTH)

AF:

0.00

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000145

Hom.:

Bravo

AF:

0.0000529

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000198

AC:

EpiCase

AF:

0.000218

EpiControl

AF:

0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Aug 07, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 27 of the C1QA protein (p.Arg27Gln). This variant is present in population databases (rs41507347, gnomAD 0.09%). This variant has not been reported in the literature in individuals affected with C1QA-related conditions. ClinVar contains an entry for this variant (Variation ID: 1441695). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The glutamine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.083

BayesDel_addAF

Benign

-0.34

BayesDel_noAF

Benign

-0.34

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.087

T;T;T

Eigen

Benign

-0.75

Eigen_PC

Benign

-0.67

FATHMM_MKL

Benign

0.69

LIST_S2

Benign

0.69

.;T;T

M_CAP

Benign

0.052

MetaRNN

Benign

0.037

T;T;T

MetaSVM

Benign

-0.70

MutationAssessor

Benign

1.8

L;.;L

PhyloP100

0.32

PrimateAI

Benign

0.26

PROVEAN

Benign

-0.95

N;N;N

REVEL

Benign

0.18

Sift

Benign

0.19

T;T;T

Sift4G

Benign

0.42

T;T;T

Polyphen

0.041

B;.;B

Vest4

0.078

MVP

0.81

MPC

0.64

ClinPred

0.052

GERP RS

0.86

PromoterAI

0.080

Neutral

(source)

Varity_R

0.043

gMVP

0.66

Mutation Taster

=89/11

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over