rs775926807
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Variant summary
Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2PP3_StrongPP5
The NM_000092.5(COL4A4):c.4288G>A(p.Gly1430Arg) variant causes a missense change. The variant allele was found at a frequency of 0.00000434 in 1,613,974 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).
Frequency
Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)
Exomes 𝑓: 0.0000041 ( 0 hom. )
Consequence
COL4A4
NM_000092.5 missense
NM_000092.5 missense
Scores
14
4
1
Clinical Significance
Conservation
PhyloP100: 5.95
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]
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ACMG classification
Classification made for transcript
Verdict is Likely_pathogenic. Variant got 7 ACMG points.
PM2
?
Very rare variant in population databases, with high coverage;
PP3
?
MetaRNN computational evidence supports a deleterious effect, 0.994
PP5
?
Variant 2-227012226-C-T is Pathogenic according to our data. Variant chr2-227012226-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 585531.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=1}.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
COL4A4 | NM_000092.5 | c.4288G>A | p.Gly1430Arg | missense_variant | 45/48 | ENST00000396625.5 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
COL4A4 | ENST00000396625.5 | c.4288G>A | p.Gly1430Arg | missense_variant | 45/48 | 5 | NM_000092.5 | P1 |
Frequencies
GnomAD3 genomes ? AF: 0.00000657 AC: 1AN: 152110Hom.: 0 Cov.: 32
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GnomAD3 exomes AF: 0.00000401 AC: 1AN: 249468Hom.: 0 AF XY: 0.00000739 AC XY: 1AN XY: 135360
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GnomAD4 exome AF: 0.00000410 AC: 6AN: 1461864Hom.: 0 Cov.: 31 AF XY: 0.00000550 AC XY: 4AN XY: 727232
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GnomAD4 genome ? AF: 0.00000657 AC: 1AN: 152110Hom.: 0 Cov.: 32 AF XY: 0.0000135 AC XY: 1AN XY: 74304
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ClinVar
Significance: Conflicting classifications of pathogenicity
Submissions summary: Pathogenic:1Uncertain:1
Revision: criteria provided, conflicting classifications
LINK: link
Submissions by phenotype
not provided Pathogenic:1Uncertain:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Athena Diagnostics | Apr 27, 2018 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Dec 15, 2023 | This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 1430 of the COL4A4 protein (p.Gly1430Arg). This variant is present in population databases (rs775926807, gnomAD 0.006%). This missense change has been observed in individual(s) with Alport syndrome (PMID: 29204651). ClinVar contains an entry for this variant (Variation ID: 585531). 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 COL4A4 protein function with a positive predictive value of 95%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Uncertain
DEOGEN2
Uncertain
D
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
LIST_S2
Uncertain
D
M_CAP
Pathogenic
D
MetaRNN
Pathogenic
D
MetaSVM
Pathogenic
D
MutationAssessor
Pathogenic
M
MutationTaster
Benign
D;D
PrimateAI
Pathogenic
D
PROVEAN
Pathogenic
D
REVEL
Pathogenic
Sift
Uncertain
D
Sift4G
Pathogenic
D
Polyphen
D
Vest4
MutPred
Gain of solvent accessibility (P = 0.0037);
MVP
MPC
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at