Is CBS p.Arg51Lys (c.152G>A) pathogenic?

CBS p.Arg51Lys (c.152G>A) is classified Uncertain significance in CBS (ClinVar, Multiple submitters, 4 submitters; last evaluated 2024-01-22). AlphaMissense: likely benign (0.0749); Absent from gnomAD v4.1; Associated with HYPERHOMOCYSTEINEMIA, THROMBOTIC, CBS-RELATED.

What condition is associated with CBS p.Arg51Lys (c.152G>A)?

CBS p.Arg51Lys (c.152G>A) is associated with HYPERHOMOCYSTEINEMIA, THROMBOTIC, CBS-RELATED, classic homocystinuria, familial thoracic aortic aneurysm and aortic dissection (ClinVar).

How common is CBS p.Arg51Lys (c.152G>A) in the general population?

CBS p.Arg51Lys (c.152G>A) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CBS p.Arg51Lys (c.152G>A)?

AlphaMissense predicts likely benign (score 0.0749) — an in-silico prediction, not a clinical call.

CBS p.Arg51Lys

c.152G>A · rs370983323 · VCV420469

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

AlphaMissense

likely benign

0.0749 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

HYPERHOMOCYSTEINEMIA, THROMBOTIC, CBS-RELATED

Computational evidence

Protein change
AlphaMissense	0.0749	likely benign
REVEL	0.439	indeterminate
SaProt	LLR -5.61	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.97	GERP 1.5, phastCons 0.75
Regional constraint	o/e 0.63	unconstrained · MANE · 5,845 bp · p 0.12 · regional, not allelic
Overall
CADD	17.99	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: CBS
Protein: p.Arg51Lys
Coding: c.152G>A
MANE Select: NM_000071
dbSNP: rs370983323
Type: single nucleotide variant
Location: chr21:43072042 (GRCh38)
Structure: AlphaFold pLDDT 90.15 · 28 PDB
Residue 51: the 'disordered' region

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

Disease context

HYPERHOMOCYSTEINEMIA, THROMBOTIC, CBS-RELATED — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: classic homocystinuria familial thoracic aortic aneurysm and aortic dissection

Similar variants

CBS p.Arg51Ser Uncertain significance ★★ ⚠ same residue
CBS p.Arg51= Likely benign ★ same residue
CBS p.Arg51fs Pathogenic/Likely pathogenic ★★ same residue
CBS c.1145+1G>A Pathogenic/Likely pathogenic ★★ same condition
CBS c.1223+1G>T Pathogenic ★★ same condition
CBS c.1224-2A>C Pathogenic ★★ same condition
CBS c.1358+1G>A Pathogenic ★★ same condition
CBS c.1359-1G>C 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/cbs-p-arg51lys (accessed [today's date]).

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