Is BLM p.Asp757fs (c.2268dup) pathogenic?

BLM p.Asp757fs (c.2268dup) is classified Pathogenic in BLM (ClinVar, Single submitter, 1 submitter; last evaluated 2024-07-05). Very rare (popmax 0.000342%, nfe); Associated with Bloom syndrome.

What condition is associated with BLM p.Asp757fs (c.2268dup)?

BLM p.Asp757fs (c.2268dup) is associated with Bloom syndrome (ClinVar).

How common is BLM p.Asp757fs (c.2268dup) in the general population?

BLM p.Asp757fs (c.2268dup) is very rare (popmax 0.000342%, nfe) (gnomAD).

How is Bloom syndrome inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

BLM p.Asp757fs

c.2268dup · VCV4292552

Pathogenic Single submitter

Classification

Pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

Consequence

frameshift

predicted LoF

gnomAD v4.1

Rare

very rare (popmax 0.000342%, nfe)

Conditions

Bloom syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function
NMD	predicted	premature termination codon in exon 10 of 22
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP 7.6	GERP 2.8, phastCons 1

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000342% European (non-Finnish) · 4/1,170,514 alleles

Filtering AF 8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 5.4e-05%

Overall 0.000276% 4/1,449,572 alleles · very rare

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: BLM
Protein: p.Asp757fs
Coding: c.2268dup
MANE Select: NM_000057
Type: Duplication
Location: chr15:90766977 (GRCh38)
Gene constraint: LOEUF 0.847 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 61.10 · 16 PDB
Residue 757: the helicase atp-binding domain; a β-strand

Full BLM gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Bloom syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Bloom syndrome (Orphanet):

Inheritance: Autosomal recessive
Onset: Antenatal, Neonatal
Prevalence: 1-9 / 100 000 (Specific population)

Similar variants

BLM p.Asp757Asn Uncertain significance ★ ⚠ same residue
BLM p.Asp757Glu Uncertain significance ★ ⚠ same residue
BLM p.Asp757His Uncertain significance ★ ⚠ same residue
BLM p.Ala481fs Pathogenic ★★ same condition
BLM p.Asp467fs Pathogenic/Likely pathogenic ★★ same condition
BLM p.Leu107fs Pathogenic/Likely pathogenic ★★ same condition
BLM p.Leu342fs Pathogenic/Likely pathogenic ★★ same condition
BLM p.Leu393fs Pathogenic ★★ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/blm-p-asp757fs (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown