rs1440033157

Variant names:

• chr2-227280930-A-AC
• rs1440033157
• NM_000091.5:c.2417dupC

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PVS1 PP5_Very_Strong

The NM_000091.5(COL4A3):​c.2417dupC​(p.Gly807ArgfsTer28) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000106 in 1,412,300 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000011 (0 hom.)
• Consequence: COL4A3 NM_000091.5 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: -0.231
• Publications: 1 publications found

Genes affected

COL4A3 (HGNC:2204): (collagen type IV alpha 3 chain) Type IV collagen, the major structural component of basement membranes, is a multimeric protein composed of 3 alpha subunits. These subunits are encoded by 6 different genes, alpha 1 through alpha 6, each of which can form a triple helix structure with 2 other subunits to form type IV collagen. This gene encodes alpha 3. In the Goodpasture syndrome, autoantibodies bind to the collagen molecules in the basement membranes of alveoli and glomeruli. The epitopes that elicit these autoantibodies are localized largely to the non-collagenous C-terminal domain of the protein. A specific kinase phosphorylates amino acids in this same C-terminal region and the expression of this kinase is upregulated during pathogenesis. This gene is also linked to an autosomal recessive form of Alport syndrome. The mutations contributing to this syndrome are also located within the exons that encode this C-terminal region. Like the other members of the type IV collagen gene family, this gene is organized in a head-to-head conformation with another type IV collagen gene so that each gene pair shares a common promoter. [provided by RefSeq, Jun 2010]

MFF-DT (HGNC:41067): (MFF divergent transcript)

ACMG classification

Our verdict: Pathogenic. The variant received 16 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PP5: Variant 2-227280930-A-AC is Pathogenic according to our data. Variant chr2-227280930-A-AC is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 552236.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000091.5. 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
	COL4A3	NM_000091.5	MANE Select	c.2417dupC	p.Gly807ArgfsTer28	frameshift	Exon 31 of 52	NP_000082.2
	MFF-DT	NR_102371.1		n.329+773dupG		intron	N/A

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL4A3	ENST00000396578.8	TSL:1 MANE Select	c.2417dupC	p.Gly807ArgfsTer28	frameshift	Exon 31 of 52	ENSP00000379823.3
	MFF-DT	ENST00000439598.6	TSL:1	n.329+773dupG		intron	N/A
	COL4A3	ENST00000871618.1		c.2417dupC	p.Gly807ArgfsTer28	frameshift	Exon 31 of 52	ENSP00000541677.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000578 AC: 1 AN: 172936 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000141

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000106 AC: 15 AN: 1412300 Hom.: 0 Cov.: 31 AF XY: 0.0000100 AC XY: 7 AN XY: 697912

African (AFR) AF: 0.00 AC: 0 AN: 32114

American (AMR) AF: 0.00 AC: 0 AN: 37898

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25246

East Asian (EAS) AF: 0.00 AC: 0 AN: 36688

South Asian (SAS) AF: 0.00 AC: 0 AN: 79862

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50354

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5710

European-Non Finnish (NFE) AF: 0.0000129 AC: 14 AN: 1085862

Other (OTH) AF: 0.0000171 AC: 1 AN: 58566

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic/Likely pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
3	-	-	Autosomal recessive Alport syndrome (3)
2	-	-	not provided (2)
1	-	-	COL4A3-related disorder (1)
1	-	-	Hematuria, benign familial, 2;C5882663:Autosomal dominant Alport syndrome;C5882699:Alport syndrome 3b, autosomal recessive (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.23
Mutation Taster		=8/192	disease causing (ClinVar)

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: rs1440033157; hg19: chr2-228145646;