chr6-31912860-A-G

Position:

• chr6-31912860-A-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The ENST00000695637.1(C2):​c.-360+14585A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000688 in 145,370 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 0.000069 (0 hom., cov: 21)
• Consequence: C2 ENST00000695637.1 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.805

Genes affected

C2 (HGNC:1248): (complement C2) Component C2 is a serum glycoprotein that functions as part of the classical pathway of the complement system. Activated C1 cleaves C2 into C2a and C2b. The serine proteinase C2a then combines with complement factor 4b to create the C3 or C5 convertase. Deficiency of C2 has been reported to associated with certain autoimmune diseases and SNPs in this gene have been associated with altered susceptibility to age-related macular degeneration. This gene localizes within the class III region of the MHC on the short arm of chromosome 6. Alternative splicing results in multiple transcript variants encoding distinct isoforms. Additional transcript variants have been described in publications but their full-length sequence has not been determined.[provided by RefSeq, Mar 2009]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-1.01).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
C2	NM_001178063.3	c.73+11721A>G		intron_variant
C2	NM_001282457.2	c.-64+14918A>G		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
C2	ENST00000452202.5	c.73+11721A>G		intron_variant		4
C2	ENST00000452323.7	c.73+11721A>G		intron_variant		2
C2	ENST00000469372.5	c.-64+14918A>G		intron_variant		2

Frequencies

GnomAD3 genomes AF: 0.0000688 AC: 10 AN: 145304 Hom.: 0 Cov.: 21

Gnomad AFR AF: 0.0000255

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000138

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: 0.000105

Gnomad OTH AF: 0.00

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

GnomAD4 genome AF: 0.0000688 AC: 10 AN: 145370 Hom.: 0 Cov.: 21 AF XY: 0.0000142 AC XY: 1 AN XY: 70178

Gnomad4 AFR AF: 0.0000254

Gnomad4 AMR AF: 0.000138

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000105

Gnomad4 OTH AF: 0.00

Alfa AF: 0.766 Hom.: 28431

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-1.0
CADD	Benign	1.4
DANN	Benign	0.16

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs28435656; hg19: chr6-31880637;