rs1770380899

Variant names:

• chr6-31935998-C-T
• rs1770380899
• NM_000063.6:c.925C>T

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 2P and 7B. PM2 BP4_Strong BP6_Moderate BP7

The NM_000063.6(C2):​c.925C>T​(p.Leu309Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,460,750 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: C2 NM_000063.6 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.353
• Publications: 0 publications found

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]

ENSG00000244255 (HGNC:):

C2-AS1 (HGNC:49464): (C2 antisense RNA 1)

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.83).
• BP6: Variant 6-31935998-C-T is Benign according to our data. Variant chr6-31935998-C-T is described in ClinVar as Likely_benign. ClinVar VariationId is 2906946.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=-0.353 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000063.6. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	C2	NM_000063.6	MANE Select	c.925C>T	p.Leu309Leu	synonymous	Exon 7 of 18	NP_000054.2
	C2	NM_001282458.2		c.838C>T	p.Leu280Leu	synonymous	Exon 7 of 18	NP_001269387.1	A0A0G2JL69
	C2	NM_001145903.3		c.529C>T	p.Leu177Leu	synonymous	Exon 5 of 16	NP_001139375.1	P06681-3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	C2	ENST00000299367.10	TSL:1 MANE Select	c.925C>T	p.Leu309Leu	synonymous	Exon 7 of 18	ENSP00000299367.5	P06681-1
	ENSG00000244255	ENST00000456570.5	TSL:2	c.530-1321C>T		intron	N/A	ENSP00000410815.1	B4E1Z4
	C2	ENST00000447952.7	TSL:3	c.739C>T	p.Leu247Leu	synonymous	Exon 6 of 17	ENSP00000391354.3	F2Z3N2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1460750 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 726694

African (AFR) AF: 0.000119 AC: 4 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52316

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111988

Other (OTH) AF: 0.00 AC: 0 AN: 60384

GnomAD4 genome Cov.: 31

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.83
CADD	Benign	5.5
DANN	Benign	0.76
PhyloP100		-0.35

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs1770380899; hg19: chr6-31903775;