rs770313956
Variant summary
Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP3
The NM_000057.4(BLM):c.4205C>T(p.Pro1402Leu) variant causes a missense change. The variant allele was found at a frequency of 0.0000335 in 1,614,032 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 Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. P1402P) has been classified as Likely benign.
Frequency
Consequence
NM_000057.4 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Uncertain_significance. Variant got 3 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
BLM | NM_000057.4 | c.4205C>T | p.Pro1402Leu | missense_variant | 22/22 | ENST00000355112.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
BLM | ENST00000355112.8 | c.4205C>T | p.Pro1402Leu | missense_variant | 22/22 | 1 | NM_000057.4 | P2 | |
ENST00000656405.1 | n.315G>A | non_coding_transcript_exon_variant | 1/2 |
Frequencies
GnomAD3 genomes ? AF: 0.0000197 AC: 3AN: 152166Hom.: 0 Cov.: 32
GnomAD3 exomes AF: 0.0000159 AC: 4AN: 251478Hom.: 0 AF XY: 0.0000147 AC XY: 2AN XY: 135914
GnomAD4 exome AF: 0.0000349 AC: 51AN: 1461866Hom.: 0 Cov.: 31 AF XY: 0.0000413 AC XY: 30AN XY: 727228
GnomAD4 genome ? AF: 0.0000197 AC: 3AN: 152166Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2AN XY: 74332
ClinVar
Submissions by phenotype
Bloom syndrome Uncertain:2
Uncertain significance, no assertion criteria provided | clinical testing | Natera, Inc. | Sep 03, 2018 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Jan 18, 2024 | This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 1402 of the BLM protein (p.Pro1402Leu). This variant is present in population databases (rs770313956, gnomAD 0.006%). This variant has not been reported in the literature in individuals affected with BLM-related conditions. ClinVar contains an entry for this variant (Variation ID: 571872). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. 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. - |
not provided Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | May 08, 2023 | Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge; This variant is associated with the following publications: (PMID: 31133068) - |
Hereditary cancer-predisposing syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Jul 17, 2023 | The p.P1402L variant (also known as c.4205C>T), located in coding exon 21 of the BLM gene, results from a C to T substitution at nucleotide position 4205. The proline at codon 1402 is replaced by leucine, an amino acid with similar properties. This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. 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