rs967698170
Variant summary
Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate
The NM_000057.4(BLM):c.1346C>A(p.Ser449Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S449C) has been classified as Uncertain significance.
Frequency
Consequence
NM_000057.4 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Uncertain_significance. Variant got 0 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
BLM | NM_000057.4 | c.1346C>A | p.Ser449Tyr | missense_variant | 7/22 | ENST00000355112.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
BLM | ENST00000355112.8 | c.1346C>A | p.Ser449Tyr | missense_variant | 7/22 | 1 | NM_000057.4 | P2 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD4 exome Cov.: 31
GnomAD4 genome ? Cov.: 32
ClinVar
Submissions by phenotype
Bloom syndrome Uncertain:2
Uncertain significance, no assertion criteria provided | clinical testing | Natera, Inc. | May 14, 2020 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Mar 04, 2020 | Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). 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. This variant has not been reported in the literature in individuals with BLM-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces serine with tyrosine at codon 449 of the BLM protein (p.Ser449Tyr). The serine residue is weakly conserved and there is a large physicochemical difference between serine and tyrosine. - |
Hereditary cancer-predisposing syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Sep 20, 2021 | The p.S449Y variant (also known as c.1346C>A), located in coding exon 6 of the BLM gene, results from a C to A substitution at nucleotide position 1346. The serine at codon 449 is replaced by tyrosine, an amino acid with dissimilar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at
Publications
No publications associated with this variant yet.