BLM p.Lys1231fs
c.3692_3693del · rs1234064430 · VCV555115
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 19 of 22 |
| Splicing | ||
| SpliceAI | — | not assessed · substitutions only |
| Constraint at this position | ||
| Conservation | phyloP -0.49 | GERP -5.1, phastCons 0.002 |
Predicted loss-of-function is descriptive, not an applied PVS1 code.
Population frequency
| Ancestry group | Frequency | 1 in |
|---|---|---|
| Ashkenazi Jewishnot grpmax-eligible | 0.00676% | 14,803 |
| European (non-Finnish)grpmax | 8.47e-05% | 1,180,020 |
Ashkenazi Jewish shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.
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.Lys1231fs
- Coding
- c.3692_3693del
- MANE Select
- NM_000057
- dbSNP
- rs1234064430
- Type
- Deletion
- Location
- chr15:90804299 (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 1231
- the 'necessary for ssdna and dna holliday junction binding' region; an α-helix; the hrdc domain
Disease context
Bloom syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatmentsFor Bloom syndrome (Orphanet):
- Inheritance
- Autosomal recessive
- Onset
- Antenatal, Neonatal
- Prevalence
- 1-9 / 100 000 (Specific population)
Similar variants
- BLM p.Lys1231= Likely benign ★ same residue
- BLM c.2193+1_2193+9del Pathogenic/Likely pathogenic ★★ same condition
- BLM c.3013_3019+4del Likely pathogenic ★★ same condition
- BLM c.3210+2del Pathogenic/Likely pathogenic ★★ same condition
- BLM c.99-8_112del Pathogenic/Likely pathogenic ★★ same condition
- BLM p.Arg545fs Pathogenic/Likely pathogenic ★★ same condition
- BLM p.Arg836fs Pathogenic ★★ same condition
- BLM p.Arg85fs Pathogenic/Likely 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-lys1231fs (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown