X-108440128-G-GA

Variant names:

• chrX-108440128-G-GA
• NM_033380.3:c.6dupA

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_033380.3(COL4A5):​c.6dupA​(p.Leu3ThrfsTer37) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. L3L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 20)
• Consequence: COL4A5 NM_033380.3 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 0.461

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

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 1007 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-108440128-G-GA is Pathogenic according to our data. Variant chrX-108440128-G-GA is described in ClinVar as [Pathogenic]. Clinvar id is 3236264.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
COL4A5	NM_033380.3	c.6dupA	p.Leu3ThrfsTer37	frameshift_variant	Exon 1 of 53	ENST00000328300.11	NP_203699.1
COL4A5	NM_000495.5	c.6dupA	p.Leu3ThrfsTer37	frameshift_variant	Exon 1 of 51		NP_000486.1
COL4A5	XM_047441811.1	c.6dupA	p.Leu3ThrfsTer37	frameshift_variant	Exon 1 of 42		XP_047297767.1
COL4A5	XM_047441810.1	c.-371dupA		5_prime_UTR_variant	Exon 1 of 54		XP_047297766.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
COL4A5	ENST00000328300.11	c.6dupA	p.Leu3ThrfsTer37	frameshift_variant	Exon 1 of 53	1	NM_033380.3	ENSP00000331902.7

Frequencies

GnomAD3 genomes Cov.: 20

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 20

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

X-linked Alport syndrome Pathogenic:1

Feb 21, 2024

MVZ Medizinische Genetik Mainz

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ACMG Criteria: PVS1,PM2_SUP,PP4 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.46

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

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Other links and lift over

hg19: chrX-107683358;