rs281874712

Positions:

• chrX-108626309-G-T

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM2 PP3_Moderate PP5_Very_Strong

The NM_033380.3(COL4A5):​c.3206G>T​(p.Gly1069Val) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. 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)
• Consequence: COL4A5 NM_033380.3 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 7.07

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 12 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.886
• PP5: Variant X-108626309-G-T is Pathogenic according to our data. Variant chrX-108626309-G-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 24605.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL4A5	NM_033380.3	c.3206G>T	p.Gly1069Val	missense_variant	36/53	ENST00000328300.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL4A5	ENST00000328300.11	c.3206G>T	p.Gly1069Val	missense_variant	36/53	1	NM_033380.3
COL4A5	ENST00000483338.1	c.2030G>T	p.Gly677Val	missense_variant	20/20	1
COL4A5	ENST00000361603.7	c.3206G>T	p.Gly1069Val	missense_variant	36/51	2		P1
COL4A5	ENST00000505728.1	c.440G>T	p.Gly147Val	missense_variant	4/5	3

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 22

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 05, 2022

This sequence change replaces glycine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 1069 of the COL4A5 protein (p.Gly1069Val). In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. This variant disrupts the p.Gly1069 amino acid residue in COL4A5. Other variant(s) that disrupt this residue have been observed in individuals with COL4A5-related conditions (PMID: 24304881), which suggests that this may be a clinically significant amino acid residue. 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: 24605). This missense change has been observed in individuals with X-linked recessive COL4A5-related conditions (PMID: 20378821; Invitae). This variant is not present in population databases (gnomAD no frequency). -

X-linked Alport syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Institute of Human Genetics Munich, Klinikum Rechts Der Isar, TU München

May 10, 2019

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.27
BayesDel_addAF	Pathogenic	0.72	D
BayesDel_noAF	Pathogenic	0.80
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.94	.;D;T
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.87	D;D;D
M_CAP	Pathogenic	0.93	D
MetaRNN	Pathogenic	0.89	D;D;D
MetaSVM	Uncertain	0.51	D
MutationAssessor	Pathogenic	3.8	H;H;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.76	T
PROVEAN	Pathogenic	-5.8	D;D;.
REVEL	Pathogenic	0.87
Sift	Pathogenic	0.0	D;D;.
Sift4G	Uncertain	0.0030	D;D;.
Polyphen		1.0	.;D;D
Vest4		0.84
MutPred		0.51		Gain of sheet (P = 0.0125);Gain of sheet (P = 0.0125);.;
MVP		0.99
MPC		0.37
ClinPred		1.0	D
GERP RS		5.8
Varity_R		0.99
gMVP		1.0

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.11		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: rs281874712; hg19: chrX-107869539; COSMIC: COSV100088792;