NM_033380.3:c.1844G>A

Variant names:

• chrX-108598766-G-A
• rs794727397
• NM_033380.3:c.1844G>A

Variant summary

Our verdict is Pathogenic. The variant received 19 ACMG points: 19P and 0B. PM1 PM2 PM5 PP2 PP3_Strong PP5_Very_Strong

The NM_033380.3(COL4A5):​c.1844G>A​(p.Gly615Glu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000912 in 1,096,734 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 Pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G615R) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 9.1e-7 (0 hom. 0 hem.)
• Consequence: COL4A5 NM_033380.3 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 9.31
• Publications: 0 publications found

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]

COL4A5 Gene-Disease associations (from GenCC):

• Alport syndrome

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen, G2P
• X-linked Alport syndrome

  Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: PanelApp Australia, Genomics England PanelApp, Myriad Women’s Health, Orphanet, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Pathogenic. The variant received 19 ACMG points.

• PM1: In a hotspot region, there are 9 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 4 benign, 3 uncertain in NM_033380.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrX-108598765-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 599064.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 538 curated pathogenic missense variants (we use a threshold of 10). The gene has 138 curated benign missense variants. Gene score misZ: 2.4995 (below the threshold of 3.09). Trascript score misZ: NaN (below the threshold of 3.09). GenCC associations: The gene is linked to X-linked Alport syndrome, Alport syndrome.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.987
• PP5: Variant X-108598766-G-A is Pathogenic according to our data. Variant chrX-108598766-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 195859.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL4A5	NM_033380.3	c.1844G>A	p.Gly615Glu	missense_variant	Exon 25 of 53	ENST00000328300.11	NP_203699.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL4A5	ENST00000328300.11	c.1844G>A	p.Gly615Glu	missense_variant	Exon 25 of 53	1	NM_033380.3	ENSP00000331902.7
COL4A5	ENST00000483338.1	c.668G>A	p.Gly223Glu	missense_variant	Exon 9 of 20	1		ENSP00000495685.1
COL4A5	ENST00000361603.7	c.1844G>A	p.Gly615Glu	missense_variant	Exon 25 of 51	2		ENSP00000354505.2

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome AF: 9.12e-7 AC: 1 AN: 1096734 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 362266

African (AFR) AF: 0.00 AC: 0 AN: 26366

American (AMR) AF: 0.00 AC: 0 AN: 35201

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19374

East Asian (EAS) AF: 0.00 AC: 0 AN: 30199

South Asian (SAS) AF: 0.00 AC: 0 AN: 54097

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40531

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3818

European-Non Finnish (NFE) AF: 0.00000119 AC: 1 AN: 841117

Other (OTH) AF: 0.00 AC: 0 AN: 46031

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Nov 27, 2022

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 615 of the COL4A5 protein (p.Gly615Glu). This variant disrupts the p.Gly615 amino acid residue in COL4A5. Other variant(s) that disrupt this residue have been observed in individuals with COL4A5-related conditions (PMID: 22921432, 25307721, 33209720), which suggests that this may be a clinically significant amino acid residue. For these reasons, this variant has been classified as Pathogenic. 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). 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. ClinVar contains an entry for this variant (Variation ID: 195859). This missense change has been observed in individual(s) with COL4A5-related conditions (PMID: 25307721). This variant is not present in population databases (gnomAD no frequency). -

Nov 21, 2014

Eurofins Ntd Llc (ga)

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.74	D
BayesDel_noAF	Pathogenic	0.83
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.94	.;D;T
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	D;D;D
M_CAP	Pathogenic	0.98	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Pathogenic	0.97	D
MutationAssessor	Pathogenic	4.4	H;H;.
PhyloP100		9.3
PrimateAI	Pathogenic	0.82	D
PROVEAN	Pathogenic	-7.0	D;D;.
REVEL	Pathogenic	0.98
Sift	Benign	0.041	D;D;.
Sift4G	Uncertain	0.0030	D;D;.
Polyphen		1.0	.;D;D
Vest4		1.0
MutPred		0.86		Gain of solvent accessibility (P = 0.024);Gain of solvent accessibility (P = 0.024);.;
MVP		1.0
MPC		0.39
ClinPred		1.0	D
GERP RS		5.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.99
gMVP		1.0
Mutation Taster		=0/100	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: rs794727397; hg19: chrX-107841996;