NM_001378156.1:c.102C>G

Variant names:

Variant summary

Our verdict is Benign. The variant received -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BS1BS2

The NM_001378156.1(C1QB):c.102C>G(p.Ala34Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000983 in 1,614,072 control chromosomes in the GnomAD database, including 12 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.0052 ( 6 hom., cov: 32)

Exomes 𝑓: 0.00054 ( 6 hom. )

Consequence

C1QB
NM_001378156.1 synonymous

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:3

Conservation

PhyloP100: 1.38

Publications

1 publications found

Variant links:

Genes affected

C1QB (HGNC:1242): (complement C1q B chain) This gene encodes the B-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]

C1QB Gene-Disease associations (from GenCC):

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

C1QB links:

ENSG00000308848 (HGNC:):

ENSG00000308848 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.52).

BP6

Variant 1-22659564-C-G is Benign according to our data. Variant chr1-22659564-C-G is described in ClinVar as [Benign]. Clinvar id is 725822.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=1.38 with no splicing effect.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00523 (796/152292) while in subpopulation AFR AF = 0.0175 (726/41544). AF 95% confidence interval is 0.0164. There are 6 homozygotes in GnomAd4. There are 363 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 6 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
C1QB	NM_001378156.1 link	c.102C>G	p.Ala34Ala	synonymous_variant	Exon 2 of 3	ENST00000509305.6	NP_001365085.1
C1QB	NM_000491.5 link	c.108C>G	p.Ala36Ala	synonymous_variant	Exon 2 of 3		NP_000482.3	P02746A0A024RAB9
C1QB	NM_001371184.3 link	c.102C>G	p.Ala34Ala	synonymous_variant	Exon 3 of 4		NP_001358113.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
C1QB	ENST00000509305.6 link	c.102C>G	p.Ala34Ala	synonymous_variant	Exon 2 of 3	1	NM_001378156.1	ENSP00000423689.1		D6R934

Frequencies

GnomAD3 genomes

AF:

0.00523

AC:

796

AN:

152174

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0175

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00347

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00813

GnomAD2 exomes

AF:

0.00140

AC:

351

AN:

251016

AF XY:

0.000921

show subpopulations

Gnomad AFR exome

AF:

0.0187

Gnomad AMR exome

AF:

0.00110

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000176

Gnomad OTH exome

AF:

0.000979

GnomAD4 exome

AF:

0.000541

AC:

791

AN:

1461780

Hom.:

Cov.:

AF XY:

0.000459

AC XY:

334

AN XY:

727196

show subpopulations

African (AFR)

AF:

0.0192

AC:

642

AN:

33478

American (AMR)

AF:

0.00123

AC:

AN:

44710

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26124

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000116

AC:

AN:

86250

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53410

Middle Eastern (MID)

AF:

0.000520

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.00000450

AC:

AN:

1111958

Other (OTH)

AF:

0.00141

AC:

AN:

60384

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.474

Heterozygous variant carriers

136

182

227

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.00523

AC:

796

AN:

152292

Hom.:

Cov.:

AF XY:

0.00487

AC XY:

363

AN XY:

74468

show subpopulations

African (AFR)

AF:

0.0175

AC:

726

AN:

41544

American (AMR)

AF:

0.00346

AC:

AN:

15306

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5180

South Asian (SAS)

AF:

0.00

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10630

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68016

Other (OTH)

AF:

0.00804

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

120

160

200

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00167

Hom.:

Bravo

AF:

0.00678

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:2

Jan 21, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

C1QB-related disorder

Benign:1

Jun 05, 2019

PreventionGenetics, part of Exact Sciences

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.52

CADD

Benign

(source)

DANN

Benign

0.40

PhyloP100

1.4

Mutation Taster

=99/1

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

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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NM_001378156.1:c.102C>G

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