Is LDLR p.Cys377Arg (c.1129T>C) pathogenic?

LDLR p.Cys377Arg (c.1129T>C) is classified Pathogenic/Likely pathogenic in LDLR (ClinVar, Multiple submitters, 3 submitters; last evaluated 2026-03-25). AlphaMissense: likely pathogenic (0.9826); Absent from gnomAD v4.1; Associated with familial hypercholesterolemia.

What condition is associated with LDLR p.Cys377Arg (c.1129T>C)?

LDLR p.Cys377Arg (c.1129T>C) is associated with familial hypercholesterolemia (ClinVar).

How common is LDLR p.Cys377Arg (c.1129T>C) in the general population?

LDLR p.Cys377Arg (c.1129T>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about LDLR p.Cys377Arg (c.1129T>C)?

AlphaMissense predicts likely pathogenic (score 0.9826) — an in-silico prediction, not a clinical call.

LDLR p.Cys377Arg

c.1129T>C · rs773064328 · VCV1727785

Pathogenic/Likely pathogenic Multiple submitters

Classification

Pathogenic/Likely pathogenic

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely pathogenic

0.9826 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

familial hypercholesterolemia

Computational evidence

Protein change
AlphaMissense	0.9826	likely pathogenic ✓ concordant with ClinVar · top 9% in LDLR
REVEL	0.985	strongly pathogenic-leaning
SaProt	LLR -10.78	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 6	GERP 1.5, phastCons 1
Regional constraint	o/e 1.00	unconstrained · MANE · 42 kb · p 0.91 · regional, not allelic
Overall
CADD	27.4	PHRED · no single calibrated threshold — expert panels disagree

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: LDLR
Protein: p.Cys377Arg
Coding: c.1129T>C
MANE Select: NM_000527
dbSNP: rs773064328
Type: single nucleotide variant
Location: chr19:11111582 (GRCh38)
Gene constraint: LOEUF 1.091 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 75.81 · 36 PDB
Residue 377: the egf-like 2; calcium-binding domain; a disulfide bond

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

Disease context

familial hypercholesterolemia — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

LDLR p.Cys377Tyr Pathogenic/Likely pathogenic ★★ ⚠ same residue
LDLR p.Cys377= Likely benign ★★ same residue
LDLR p.Cys377fs Pathogenic ★★ same residue
LDLR p.Cys377Gly Pathogenic/Likely pathogenic ★★ same residue
LDLR p.Cys377Phe Pathogenic/Likely pathogenic ★★ same residue
LDLR p.Cys377Ser Pathogenic/Likely pathogenic ★★ same residue
LDLR c.1186+5G>A Likely pathogenic ★★★ same condition
LDLR c.1359-1G>A 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/ldlr-p-cys377arg (accessed [today's date]).

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