rs1555571529
Variant summary
Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1PM2PP5_Moderate
The NM_000088.4(COL1A1):c.4327_4328insGATGTGG(p.Ala1443GlyfsTer110) variant causes a frameshift change involving the alteration of a 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. A1443A) has been classified as Likely benign.
Frequency
Genomes: not found (cov: 29)
Consequence
COL1A1
NM_000088.4 frameshift
NM_000088.4 frameshift
Scores
Not classified
Clinical Significance
Conservation
PhyloP100: 7.91
Genes affected
COL1A1 (HGNC:2197): (collagen type I alpha 1 chain) This gene encodes the pro-alpha1 chains of type I collagen whose triple helix comprises two alpha1 chains and one alpha2 chain. Type I is a fibril-forming collagen found in most connective tissues and is abundant in bone, cornea, dermis and tendon. Mutations in this gene are associated with osteogenesis imperfecta types I-IV, Ehlers-Danlos syndrome type VIIA, Ehlers-Danlos syndrome Classical type, Caffey Disease and idiopathic osteoporosis. Reciprocal translocations between chromosomes 17 and 22, where this gene and the gene for platelet-derived growth factor beta are located, are associated with a particular type of skin tumor called dermatofibrosarcoma protuberans, resulting from unregulated expression of the growth factor. Two transcripts, resulting from the use of alternate polyadenylation signals, have been identified for this gene. [provided by R. Dalgleish, Feb 2008]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 12 ACMG points.
PVS1
?
Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 23 pathogenic variants in the truncated region.
PM2
?
Very rare variant in population databases, with high coverage;
PP5
?
Variant 17-50185569-G-GCCACATC is Pathogenic according to our data. Variant chr17-50185569-G-GCCACATC is described in ClinVar as [Pathogenic]. Clinvar id is 456790.Status of the report is criteria_provided_single_submitter, 1 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
COL1A1 | NM_000088.4 | c.4327_4328insGATGTGG | p.Ala1443GlyfsTer110 | frameshift_variant | 51/51 | ENST00000225964.10 | |
COL1A1 | XM_005257058.5 | c.4057_4058insGATGTGG | p.Ala1353GlyfsTer110 | frameshift_variant | 49/49 | ||
COL1A1 | XM_005257059.5 | c.3409_3410insGATGTGG | p.Ala1137GlyfsTer110 | frameshift_variant | 38/38 | ||
COL1A1 | XM_011524341.2 | c.4129_4130insGATGTGG | p.Ala1377GlyfsTer110 | frameshift_variant | 48/48 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
COL1A1 | ENST00000225964.10 | c.4327_4328insGATGTGG | p.Ala1443GlyfsTer110 | frameshift_variant | 51/51 | 1 | NM_000088.4 | P1 |
Frequencies
GnomAD3 genomes ? Cov.: 29
GnomAD3 genomes
?
Cov.:
29
GnomAD4 exome Cov.: 32
GnomAD4 exome
Cov.:
32
GnomAD4 genome ? Cov.: 29
GnomAD4 genome
?
Cov.:
29
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:1
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Osteogenesis imperfecta type I Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Aug 14, 2017 | For these reasons, this variant has been classified as Pathogenic. Two frameshift variants downstream of this variant (c.4329_4332dup and c.4357_4361del) have been determined to be pathogenic (PMID: 2295701, Invitae). All three variants results in a similar shift in the reading frame. This suggests the disruption of this region and extension of the COL1A1 protein are causative of disease. This variant is not present in population databases (ExAC no frequency). This sequence change inserts 7 nucleotides in exon 51 of the COL1A1 mRNA (c.4321_4327dupGATGTGG), causing a frameshift in the last exon at codon 1443. While this is not expected to result in nonsense mediated decay of the mRNA, it is predicted to alter the last 22 amino acids of the protein and extend it by an additional 88 amino acids (p.Ala1443Glyfs*110). This variant has not been reported in the literature in individuals with COL1A1-related disease. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at