rs746244182
Variant summary
Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong
The NM_000057.4(BLM):βc.1479_1480delβ(p.Thr494ProfsTer9) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000149 in 1,614,018 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (β β ). Synonymous variant affecting the same amino acid position (i.e. N493N) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.
Frequency
Consequence
NM_000057.4 frameshift
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 18 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
BLM | NM_000057.4 | c.1479_1480del | p.Thr494ProfsTer9 | frameshift_variant | 7/22 | ENST00000355112.8 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
BLM | ENST00000355112.8 | c.1479_1480del | p.Thr494ProfsTer9 | frameshift_variant | 7/22 | 1 | NM_000057.4 | P2 |
Frequencies
GnomAD3 genomes ? AF: 0.00000657 AC: 1AN: 152234Hom.: 0 Cov.: 32
GnomAD3 exomes AF: 0.00000799 AC: 2AN: 250282Hom.: 0 AF XY: 0.00000738 AC XY: 1AN XY: 135428
GnomAD4 exome AF: 0.0000157 AC: 23AN: 1461784Hom.: 0 AF XY: 0.0000151 AC XY: 11AN XY: 727178
GnomAD4 genome ? AF: 0.00000657 AC: 1AN: 152234Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0AN XY: 74370
ClinVar
Submissions by phenotype
Bloom syndrome Pathogenic:5
Pathogenic, criteria provided, single submitter | clinical testing | Baylor Genetics | Aug 04, 2023 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Jan 17, 2024 | This sequence change creates a premature translational stop signal (p.Thr494Profs*9) in the BLM gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in BLM are known to be pathogenic (PMID: 17407155). This variant is present in population databases (rs746244182, gnomAD 0.002%). 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: 371108). For these reasons, this variant has been classified as Pathogenic. - |
Pathogenic, no assertion criteria provided | clinical testing | Natera, Inc. | Sep 16, 2020 | - - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Counsyl | Jun 28, 2016 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | DASA | Mar 05, 2022 | The c.1479_1480del;p.(Thr494Profs*9) is a null frameshift variant (NMD) in the BLM gene and predicts alteration of the nonsense-mediate decay - NMD is present in a relevant exon to the transcript - PVS1. This sequence change has been observed in affected individual(s) and ClinVar contains an entry for this variant (ClinVar ID: 371108). PS4_moderate. The variant is present at low allele frequencies population databases (rs746244182 β gnomAD 0.00007991%; ABraOM no frequency - http://abraom.ib.usp.br.) - PM2_supporting. In summary, the currently available evidence indicates that the variant is pathogenic. - |
Hereditary cancer-predisposing syndrome Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | Dec 07, 2022 | The c.1479_1480delTA pathogenic mutation, located in coding exon 6 of the BLM gene, results from a deletion of two nucleotides at nucleotide positions 1479 to 1480, causing a translational frameshift with a predicted alternate stop codon (p.T494Pfs*9). This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at