NM_033380.3:c.2732G>A

Variant names:

• chrX-108621857-G-A
• rs104886363
• NM_033380.3:c.2732G>A

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_033380.3(COL4A5):​c.2732G>A​(p.Gly911Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000912 in 1,096,098 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 22)
  • Exomes 𝑓: 9.1e-7 (0 hom. 0 hem.)
• Consequence: COL4A5 NM_033380.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 9.20

Genes affected

COL4A5 (HGNC:2207): (collagen type IV alpha 5 chain) This gene encodes one of the six subunits of type IV collagen, the major structural component of basement membranes. Mutations in this gene are associated with X-linked Alport syndrome, also known as hereditary nephritis. 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. Alternatively spliced transcript variants have been identified for this gene. [provided by RefSeq, Aug 2010]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.994
• PP5: Variant X-108621857-G-A is Pathogenic according to our data. Variant chrX-108621857-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1705496.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chrX-108621857-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL4A5	NM_033380.3	c.2732G>A	p.Gly911Glu	missense_variant	Exon 32 of 53	ENST00000328300.11	NP_203699.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL4A5	ENST00000328300.11	c.2732G>A	p.Gly911Glu	missense_variant	Exon 32 of 53	1	NM_033380.3	ENSP00000331902.7
COL4A5	ENST00000483338.1	c.1556G>A	p.Gly519Glu	missense_variant	Exon 16 of 20	1		ENSP00000495685.1
COL4A5	ENST00000361603.7	c.2732G>A	p.Gly911Glu	missense_variant	Exon 32 of 51	2		ENSP00000354505.2

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome AF: 9.12e-7 AC: 1 AN: 1096098 Hom.: 0 Cov.: 29 AF XY: 0.00 AC XY: 0 AN XY: 361558

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000119

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 22

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:1

Jan 29, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with glutamic acid, which is acidic and polar, at codon 911 of the COL4A5 protein (p.Gly911Glu). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with Alport syndrome (PMID: 10684360; Invitae). ClinVar contains an entry for this variant (Variation ID: 1705496). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt COL4A5 protein function with a positive predictive value of 95%. This variant disrupts the triple helix domain of COL4A5. Glycine residues within the Gly-Xaa-Yaa repeats of the triple helix domain are required for the structure and stability of fibrillar collagens (PMID: 7695699, 8218237, 19344236). In COL4A5, missense variants at these glycine residues are significantly enriched in individuals with disease (PMID: 23720012, 27627812) compared to the general population (ExAC). For these reasons, this variant has been classified as Pathogenic. -

COL4A5-related disorder Pathogenic:1

Jun 26, 2023

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The COL4A5 c.2732G>A variant is predicted to result in the amino acid substitution p.Gly911Glu. This variant was reported in an individual with Alport syndrome and was reported to occur de novo in a female patient with features of a COL4A5-related disorder (Cheong et al. 2000. PubMed ID: 10684360; Yokota et al. 2016. PubMed ID: 27796712). At PreventionGenetics, we have observed the c.2732G>A variant in an individual with kidney disease (internal data). The p.Gly911Glu variant affects a Gly residue of the conserved triple helical domain, where substitutions of the glycine are usually pathogenic (Hudson et al. 1993. PubMed ID: 8253711; https://www.ncbi.nlm.nih.gov/books/NBK21582/). This variant has not been reported in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. This variant is interpreted as pathogenic. -

X-linked Alport syndrome Pathogenic:1

Sep 01, 2022

3billion

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The variant is not observed in the gnomAD v2.1.1 dataset. Missense changes are a common disease-causing mechanism. In silico tool predictions suggest damaging effect of the variant on gene or gene product (REVEL: 0.99; 3Cnet: 0.98). Same nucleotide change resulting in same amino acid change has been previously reported to be associated with COL4A5 -related disorder (PMID: 10684360). A different missense change at the same codon (p.Gly911Arg) has been reported to be associated with COL4A5 -related disorder (PMID: 29204651). Therefore, this variant is classified as Likely pathogenic according to the recommendation of ACMG/AMP guideline. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.74	D
BayesDel_noAF	Pathogenic	0.83
CADD	Uncertain	26
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.94	.;D;D
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.95	D;D;D
M_CAP	Pathogenic	0.98	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Pathogenic	0.97	D
MutationAssessor	Pathogenic	4.2	H;H;.
PrimateAI	Pathogenic	0.89	D
PROVEAN	Pathogenic	-6.4	D;D;.
REVEL	Pathogenic	0.99
Sift	Pathogenic	0.0	D;D;.
Sift4G	Pathogenic	0.0	D;D;.
Polyphen		1.0	.;D;D
Vest4		1.0
MutPred		1.0		Gain of solvent accessibility (P = 0.0411);Gain of solvent accessibility (P = 0.0411);.;
MVP		1.0
MPC		0.39
ClinPred		1.0	D
GERP RS		5.7
Varity_R		0.99
gMVP		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs104886363; hg19: chrX-107865087; COSMIC: COSV60362117; COSMIC: COSV60362117;