Is DKC1 p.Gly326= (c.978C>T) pathogenic?

DKC1 p.Gly326= (c.978C>T) is classified Benign in DKC1 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-03-13). Ultra-rare (popmax 0.042%, afr); Associated with dyskeratosis congenita.

What condition is associated with DKC1 p.Gly326= (c.978C>T)?

DKC1 p.Gly326= (c.978C>T) is associated with dyskeratosis congenita (ClinVar).

How common is DKC1 p.Gly326= (c.978C>T) in the general population?

DKC1 p.Gly326= (c.978C>T) is ultra-rare (popmax 0.042%, afr) (gnomAD).

How is Dyskeratosis congenita inherited?

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

DKC1 p.Gly326=

c.978C>T · rs145325102 · VCV948131

Benign Single submitter

Classification

Benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.042%, afr)

Conditions

dyskeratosis congenita

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.7	GERP 4.2, phastCons 1
Overall
CADD	12.3	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.042% African / African-American · 24/57,145 alleles

Filtering AF 0.0289% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0246%

Overall 0.00215% 26/1,209,232 alleles · ultra-rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.042%	2,381
Admixed American	0.00218%	45,792
Remaining individualsnot grpmax-eligible	0.0021%	47,583

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: DKC1
Protein: p.Gly326=
Coding: c.978C>T
MANE Select: NM_001363
dbSNP: rs145325102
Type: single nucleotide variant
Location: chrX:154770821 (GRCh38)
Structure: AlphaFold pLDDT 79.74 · 7 PDB
Residue 326: the pua domain

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.Gly326Ser Uncertain significance ★ ⚠ same residue
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

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-gly326 (accessed [today's date]).

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