1-22648301-C-T

Variant names:

• chr1-22648301-C-T
• rs294180
• ENST00000836788.1:n.82-44G>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The ENST00000836788.1(ENSG00000308848):​n.82-44G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000659 in 151,746 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.0000066 (0 hom., cov: 30)
• Consequence: ENSG00000308848 ENST00000836788.1 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.03
• Publications: 9 publications found

Genes affected

ENSG00000308848 (HGNC:):

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 Gene-Disease associations (from GenCC):

• C1Q deficiency

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

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
C1QC	NM_172369.5	c.*518C>T		downstream_gene_variant		ENST00000374640.9	NP_758957.2
C1QC	NM_001114101.3	c.*518C>T		downstream_gene_variant			NP_001107573.1
C1QC	NM_001347619.2	c.*518C>T		downstream_gene_variant			NP_001334548.1
C1QC	NM_001347620.2	c.*518C>T		downstream_gene_variant			NP_001334549.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
C1QC	ENST00000374640.9	c.*518C>T		downstream_gene_variant		1	NM_172369.5	ENSP00000363771.4

Frequencies

GnomAD3 genomes AF: 0.00000659 AC: 1 AN: 151746 Hom.: 0 Cov.: 30

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000194

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.00000659 AC: 1 AN: 151746 Hom.: 0 Cov.: 30 AF XY: 0.0000135 AC XY: 1 AN XY: 74042

African (AFR) AF: 0.00 AC: 0 AN: 41324

American (AMR) AF: 0.00 AC: 0 AN: 15232

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3464

East Asian (EAS) AF: 0.000194 AC: 1 AN: 5150

South Asian (SAS) AF: 0.00 AC: 0 AN: 4800

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10520

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67944

Other (OTH) AF: 0.00 AC: 0 AN: 2084

Alfa AF: 0.00 Hom.: 771

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
CADD	Benign	0.30
DANN	Benign	0.91
PhyloP100		-1.0

Splicing

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

Other links and lift over

dbSNP: rs294180; hg19: chr1-22974794;