Is KRT83 p.Arg293Cys (c.877C>T) pathogenic?

KRT83 p.Arg293Cys (c.877C>T) is classified Conflicting classifications of pathogenicity in KRT83 (ClinVar, Conflicting submitters, 2 submitters; last evaluated 2025-01-18). AlphaMissense: likely benign (0.1777); Ultra-rare (popmax 0.0881%, afr); Associated with monilethrix.

What condition is associated with KRT83 p.Arg293Cys (c.877C>T)?

KRT83 p.Arg293Cys (c.877C>T) is associated with monilethrix (ClinVar).

How common is KRT83 p.Arg293Cys (c.877C>T) in the general population?

KRT83 p.Arg293Cys (c.877C>T) is ultra-rare (popmax 0.0881%, afr) (gnomAD).

How is Monilethrix inherited?

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

What do computational predictors say about KRT83 p.Arg293Cys (c.877C>T)?

AlphaMissense predicts likely benign (score 0.1777) — an in-silico prediction, not a clinical call.

KRT83 p.Arg293Cys

c.877C>T · rs143037477 · VCV309515

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.1777 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0881%, afr)

Missense predictors

1/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

monilethrix

Computational evidence

Protein change
AlphaMissense	0.1777	likely benign
REVEL	0.557	indeterminate
SaProt	LLR -10.31	damaging
⇒ SaProt calls this damaging; AlphaMissense does not; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.6	GERP 0.75, phastCons 0.98
Regional constraint	o/e 0.98	unconstrained · MANE · 6,701 bp · p 0.63 · regional, not allelic
Overall
CADD	23.0	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

Grpmax group 0.0881% African / African-American · 66/74,920 alleles

Filtering AF 0.071% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0648%

Overall 0.0103% 166/1,614,070 alleles · ultra-rare exomes 127/1,461,894 · genomes 39/152,176 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0881%	1,135
European (non-Finnish)	0.00805%	12,422
Remaining individualsnot grpmax-eligible	0.0064%	15,623
East Asian	0.00223%	44,890

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: KRT83
Protein: p.Arg293Cys
Coding: c.877C>T
MANE Select: NM_002282
dbSNP: rs143037477
Type: single nucleotide variant
Location: chr12:52316897 (GRCh38)
Gene constraint: LOEUF 1.226 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 74.81
Residue 293: the if rod domain; the 'coil 2' region

Full KRT83 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

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

For Monilethrix (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

KRT83 p.Arg293His Uncertain significance ★★ ⚠ same residue
KRT83 p.Glu407Lys Likely pathogenic ★★ same condition
KRT83 p.Arg168Trp Uncertain significance ★★ ⚠ same condition
KRT83 p.Arg272Gln Uncertain significance ★★ ⚠ same condition
KRT83 p.Glu172Lys Uncertain significance ★★ ⚠ same condition
KRT83 c.1041+6A>G Benign ★★ same condition
KRT83 c.1042-4C>A Benign ★★ same condition
KRT83 c.750+15A>G Benign ★★ 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/krt83-p-arg293cys (accessed [today's date]).

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