Is DKC1 p.Cys230= (c.690T>C) pathogenic?

DKC1 p.Cys230= (c.690T>C) is classified Likely benign in DKC1 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-05-02). Absent from gnomAD v4.1; Associated with dyskeratosis congenita.

What condition is associated with DKC1 p.Cys230= (c.690T>C)?

DKC1 p.Cys230= (c.690T>C) is associated with dyskeratosis congenita (ClinVar).

How common is DKC1 p.Cys230= (c.690T>C) in the general population?

DKC1 p.Cys230= (c.690T>C) is absent from gnomAD v4.1 (gnomAD).

How is Dyskeratosis congenita inherited?

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

DKC1 p.Cys230=

c.690T>C · rs2523688333 · VCV2748351

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

dyskeratosis congenita

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.54	indeterminate
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.53	GERP 0.49, phastCons 0.12
Overall
CADD	8.088	PHRED · no single calibrated threshold — expert panels disagree

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: DKC1
Protein: p.Cys230=
Coding: c.690T>C
MANE Select: NM_001363
dbSNP: rs2523688333
Type: single nucleotide variant
Location: chrX:154768351 (GRCh38)
Structure: AlphaFold pLDDT 79.74 · 7 PDB
Residue 230: an α-helix

Full DKC1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

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

For Dyskeratosis congenita (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive, X-linked recessive
Onset: Adolescent, Adult, Childhood, Infancy, Neonatal
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

DKC1 p.Ala353Val Pathogenic ★★ ⚠ same condition
DKC1 p.Asn63Lys Pathogenic/Likely pathogenic ★★ ⚠ same condition
DKC1 p.Thr49Met Pathogenic ★★ ⚠ same condition
DKC1 p.Thr66Ala Pathogenic/Likely pathogenic ★★ ⚠ same condition
DKC1 c.1339-10T>G Uncertain significance ★★ same condition
DKC1 c.16+5G>A Uncertain significance ★★ same condition
DKC1 c.640+3G>A Uncertain significance ★★ same condition
DKC1 p.Ala162Thr Uncertain significance ★★ ⚠ 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/dkc1-p-cys230 (accessed [today's date]).

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