rs794727261
Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong
The NM_001844.5(COL2A1):c.258C>A(p.Cys86Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. 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 Pathogenic (★★). Variant results in nonsense mediated mRNA decay.
Frequency
Genomes: not found (cov: 32)
Consequence
COL2A1
NM_001844.5 stop_gained
NM_001844.5 stop_gained
Scores
2
4
1
Clinical Significance
Conservation
PhyloP100: 0.677
Genes affected
COL2A1 (HGNC:2200): (collagen type II alpha 1 chain) This gene encodes the alpha-1 chain of type II collagen, a fibrillar collagen found in cartilage and the vitreous humor of the eye. Mutations in this gene are associated with achondrogenesis, chondrodysplasia, early onset familial osteoarthritis, SED congenita, Langer-Saldino achondrogenesis, Kniest dysplasia, Stickler syndrome type I, and spondyloepimetaphyseal dysplasia Strudwick type. In addition, defects in processing chondrocalcin, a calcium binding protein that is the C-propeptide of this collagen molecule, are also associated with chondrodysplasia. There are two transcripts identified for this gene. [provided by RefSeq, Jul 2008]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 18 ACMG points.
PVS1
?
Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
PM2
?
Very rare variant in population databases, with high coverage;
PP5
?
Variant 12-47999953-G-T is Pathogenic according to our data. Variant chr12-47999953-G-T is described in ClinVar as [Pathogenic]. Clinvar id is 195148.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr12-47999953-G-T is described in Lovd as [Pathogenic]. Variant chr12-47999953-G-T is described in Lovd as [Likely_pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
COL2A1 | NM_001844.5 | c.258C>A | p.Cys86Ter | stop_gained | 2/54 | ENST00000380518.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
COL2A1 | ENST00000380518.8 | c.258C>A | p.Cys86Ter | stop_gained | 2/54 | 1 | NM_001844.5 | P1 | |
COL2A1 | ENST00000337299.7 | c.86-1522C>A | intron_variant | 1 | |||||
COL2A1 | ENST00000474996.6 | n.496C>A | non_coding_transcript_exon_variant | 3/8 | 3 | ||||
COL2A1 | ENST00000490609.2 | n.491C>A | non_coding_transcript_exon_variant | 2/2 | 2 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
GnomAD4 exome Cov.: 32
GnomAD4 exome
Cov.:
32
GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:4
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
not provided Pathogenic:3
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Dec 25, 2023 | This sequence change creates a premature translational stop signal (p.Cys86*) in the COL2A1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in COL2A1 are known to be pathogenic (PMID: 20179744). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with Stickler syndrome (PMID: 12429249, 23592912, 28559085). ClinVar contains an entry for this variant (Variation ID: 195148). For these reasons, this variant has been classified as Pathogenic. - |
Pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Dec 02, 2021 | Reported in patients with Stickler syndrome and described as being associated with a high incidence of ocular involvement and a lower incidence of the systemic features associated with Stickler syndrome (Donoso et al., 2002; Parma et al., 2002; Stone et al., 2017); Not observed in large population cohorts (Lek et al., 2016); Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Located in exon 2, which is an alternatively spliced exon; a genotype-phenotype correlation of variants in exon 2 with a predominantly ocular phenotype has been proposed due to differential tissue expression of alternative isoforms (Donoso et al., 2003; McAlinden et al., 2008); Reported in ClinVar as pathogenic (ClinVar Variant ID# 195148; Landrum et al., 2016); This variant is associated with the following publications: (PMID: 12429249, 12429250, 27234559, 28559085, 32039712, 23592912, 17721977) - |
Pathogenic, criteria provided, single submitter | clinical testing | Eurofins Ntd Llc (ga) | Nov 13, 2017 | - - |
Legg-Calve-Perthes disease;C0220685:Achondrogenesis type II;C0265279:Kniest dysplasia;C0432214:Namaqualand hip dysplasia;C0796173:Spondyloperipheral dysplasia;C1835437:Platyspondylic dysplasia, Torrance type;C1836080:Stickler syndrome, type I, nonsyndromic ocular;C1836683:Spondyloepiphyseal dysplasia with metatarsal shortening;C1851536:Multiple epiphyseal dysplasia, Beighton type;C2020284:Stickler syndrome type 1;C2745959:Spondyloepiphyseal dysplasia congenita;C4225273:Spondyloepiphyseal dysplasia, Stanescu type;C4551562:Avascular necrosis of femoral head, primary, 1;C4759767:Spondylometaphyseal dysplasia Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Fulgent Genetics, Fulgent Genetics | Oct 31, 2018 | - - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
Cadd
Pathogenic
Dann
Uncertain
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Uncertain
D
MutationTaster
Benign
A;D
Vest4
GERP RS
RBP_binding_hub_radar
RBP_regulation_power_radar
Splicing
Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at