2-227094171-A-G

Variant names:

Variant summary

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

The NM_000092.5(COL4A4):c.1323T>C(p.Pro441Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00285 in 1,613,722 control chromosomes in the GnomAD database, including 87 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.014 ( 39 hom., cov: 33)

Exomes 𝑓: 0.0016 ( 48 hom. )

Consequence

COL4A4
NM_000092.5 synonymous

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:9

Conservation

PhyloP100: -1.46

Publications

2 publications found

Variant links:

Genes affected

COL4A4 (HGNC:2206): (collagen type IV alpha 4 chain) This gene encodes one of the six subunits of type IV collagen, the major structural component of basement membranes. This particular collagen IV subunit, however, is only found in a subset of basement membranes. 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. Mutations in this gene are associated with type II autosomal recessive Alport syndrome (hereditary glomerulonephropathy) and with familial benign hematuria (thin basement membrane disease). Two transcripts, differing only in their transcription start sites, have been identified for this gene and, as is common for collagen genes, multiple polyadenylation sites are found in the 3' UTR. [provided by RefSeq, Jul 2008]

COL4A4 Gene-Disease associations (from GenCC):

autosomal recessive Alport syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Myriad Women’s Health, Ambry Genetics, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
Alport syndrome
Inheritance: SD Classification: DEFINITIVE Submitted by: ClinGen
hematuria, benign familial, 1
Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp
autosomal dominant Alport syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

COL4A4 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=-0.61).

BP6

Variant 2-227094171-A-G is Benign according to our data. Variant chr2-227094171-A-G is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 255013.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-1.46 with no splicing effect.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.0144 (2198/152328) while in subpopulation AFR AF = 0.0498 (2072/41568). AF 95% confidence interval is 0.0481. There are 39 homozygotes in GnomAd4. There are 1047 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 39 AR,AD,SD gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000092.5. 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
	COL4A4	NM_000092.5	MANE Select	c.1323T>C	p.Pro441Pro	synonymous	Exon 20 of 48	NP_000083.3	P53420

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	COL4A4	ENST00000396625.5	TSL:5 MANE Select	c.1323T>C	p.Pro441Pro	synonymous	Exon 20 of 48	ENSP00000379866.3	P53420

Frequencies

GnomAD3 genomes

AF:

0.0144

AC:

2193

AN:

152210

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0498

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00491

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00633

Gnomad NFE

AF:

0.000367

Gnomad OTH

AF:

0.0110

GnomAD2 exomes

AF:

0.00380

AC:

943

AN:

248288

AF XY:

0.00309

show subpopulations

Gnomad AFR exome

AF:

0.0512

Gnomad AMR exome

AF:

0.00221

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000454

Gnomad OTH exome

AF:

0.00266

GnomAD4 exome

AF:

0.00164

AC:

2403

AN:

1461394

Hom.:

Cov.:

AF XY:

0.00154

AC XY:

1119

AN XY:

727012

show subpopulations

African (AFR)

AF:

0.0517

AC:

1730

AN:

33460

American (AMR)

AF:

0.00248

AC:

111

AN:

44692

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26092

East Asian (EAS)

AF:

0.00

AC:

AN:

39684

South Asian (SAS)

AF:

0.000197

AC:

AN:

86222

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53370

Middle Eastern (MID)

AF:

0.00993

AC:

AN:

5740

European-Non Finnish (NFE)

AF:

0.000228

AC:

253

AN:

1111768

Other (OTH)

AF:

0.00389

AC:

235

AN:

60366

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

129

258

387

516

645

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

120

180

240

300

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0144

AC:

2198

AN:

152328

Hom.:

Cov.:

AF XY:

0.0141

AC XY:

1047

AN XY:

74500

show subpopulations

African (AFR)

AF:

0.0498

AC:

2072

AN:

41568

American (AMR)

AF:

0.00490

AC:

AN:

15304

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.000207

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10626

Middle Eastern (MID)

AF:

0.00680

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000368

AC:

AN:

68020

Other (OTH)

AF:

0.0109

AC:

AN:

2116

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.507

Heterozygous variant carriers

110

220

329

439

549

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

104

130

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00714

Hom.:

Bravo

AF:

0.0160

Asia WGS

AF:

0.00462

AC:

AN:

3478

EpiCase

AF:

0.000109

EpiControl

AF:

0.000652

ClinVar

ClinVar submissions

Significance:Benign/Likely benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (3)

not specified (3)

Alport syndrome (2)

Focal segmental glomerulosclerosis (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.61

CADD

Benign

1.6

(source)

DANN

Benign

0.51

PhyloP100

-1.5

Mutation Taster

=100/0

polymorphism

(source)

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

Publications

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over