rs765636566
Variant summary
Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate
The NM_000057.4(BLM):c.2656C>A(p.His886Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000087 in 1,608,378 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 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. H886P) 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.2656C>A | p.His886Asn | missense_variant | 13/22 | ENST00000355112.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
BLM | ENST00000355112.8 | c.2656C>A | p.His886Asn | missense_variant | 13/22 | 1 | NM_000057.4 | P2 |
Frequencies
GnomAD3 genomes AF: 0.00000657 AC: 1AN: 152160Hom.: 0 Cov.: 32
GnomAD3 exomes AF: 0.0000239 AC: 6AN: 251062Hom.: 0 AF XY: 0.0000221 AC XY: 3AN XY: 135740
GnomAD4 exome AF: 0.00000893 AC: 13AN: 1456218Hom.: 0 Cov.: 30 AF XY: 0.00000690 AC XY: 5AN XY: 724690
GnomAD4 genome AF: 0.00000657 AC: 1AN: 152160Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0AN XY: 74336
ClinVar
Submissions by phenotype
Bloom syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Invitae | Sep 17, 2022 | This sequence change replaces histidine, which is basic and polar, with asparagine, which is neutral and polar, at codon 886 of the BLM protein (p.His886Asn). This variant is present in population databases (rs765636566, gnomAD 0.04%). 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: 524759). 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 BLM protein function. 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. - |
Hereditary cancer-predisposing syndrome Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Ambry Genetics | Mar 28, 2024 | The p.H886N variant (also known as c.2656C>A), located in coding exon 12 of the BLM gene, results from a C to A substitution at nucleotide position 2656. The histidine at codon 886 is replaced by asparagine, an amino acid with similar properties. This amino acid position is not well conserved in available vertebrate species. 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