rs36049859

Positions:

• chr2-227042167-T-C

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BA1

The NM_000092.5(COL4A4):​c.3486A>G​(p.Pro1162=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00297 in 1,608,782 control chromosomes in the GnomAD database, including 115 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.015 (64 hom., cov: 32)
  • Exomes 𝑓: 0.0017 (51 hom.)
• Consequence: COL4A4 NM_000092.5 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:10
• Conservation: PhyloP100: 0.837

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]

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.49).
• BP6: Variant 2-227042167-T-C is Benign according to our data. Variant chr2-227042167-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 255030.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-227042167-T-C is described in Lovd as [Benign].
• BP7: Synonymous conserved (PhyloP=0.837 with no splicing effect.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0516 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL4A4	NM_000092.5	c.3486A>G	p.Pro1162=	synonymous_variant	37/48	ENST00000396625.5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL4A4	ENST00000396625.5	c.3486A>G	p.Pro1162=	synonymous_variant	37/48	5	NM_000092.5	P1

Frequencies

GnomAD3 genomes AF: 0.0154 AC: 2343 AN: 152160 Hom.: 64 Cov.: 32

Gnomad AFR AF: 0.0535

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00504

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000279

Gnomad OTH AF: 0.0143

GnomAD3 exomes AF: 0.00403 AC: 1004 AN: 249432 Hom.: 22 AF XY: 0.00305 AC XY: 413 AN XY: 135324

Gnomad AFR exome AF: 0.0570

Gnomad AMR exome AF: 0.00243

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000265

Gnomad OTH exome AF: 0.00115

GnomAD4 exome AF: 0.00167 AC: 2426 AN: 1456504 Hom.: 51 Cov.: 29 AF XY: 0.00145 AC XY: 1048 AN XY: 724922

Gnomad4 AFR exome AF: 0.0553

Gnomad4 AMR exome AF: 0.00273

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000813

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000219

Gnomad4 OTH exome AF: 0.00326

GnomAD4 genome AF: 0.0154 AC: 2347 AN: 152278 Hom.: 64 Cov.: 32 AF XY: 0.0146 AC XY: 1084 AN XY: 74448

Gnomad4 AFR AF: 0.0534

Gnomad4 AMR AF: 0.00503

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000208

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000279

Gnomad4 OTH AF: 0.0142

Alfa AF: 0.00766 Hom.: 13

Bravo AF: 0.0177

Asia WGS AF: 0.00260 AC: 9 AN: 3478

EpiCase AF: 0.000327

EpiControl AF: 0.000237

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:10

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:5

Benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Oct 09, 2017	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, no assertion criteria provided	clinical testing	Genome Diagnostics Laboratory, University Medical Center Utrecht	-	- -
Benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Mar 21, 2016	p.Pro1162Pro in exon 37 of COL4A4: This variant is not expected to have clinical significance because it does not alter an amino acid residue, is not located wi thin the splice consensus sequence, and has been identified in 5.65% (554/9802) of African chromosomes by the Exome Aggregation Consortium (ExAC, http://exac.br oadinstitute.org; dbSNP rs2229815). -

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 31, 2024	- -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Feb 28, 2018	- -

Alport syndrome Benign:2

Benign, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -
Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Apr 27, 2017	This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Focal segmental glomerulosclerosis Benign:1

Benign, criteria provided, single submitter

clinical testing

Genome Diagnostics Laboratory, The Hospital for Sick Children

Jun 04, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.49
CADD	Benign	8.4
DANN	Benign	0.77

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

LitVar

Other links and lift over

dbSNP: rs2229815; hg19: chr2-227906883;