Is DRC1 p.Ser656Phe (c.1967C>T) pathogenic?

DRC1 p.Ser656Phe (c.1967C>T) is classified Uncertain significance in DRC1 (ClinVar, Single submitter, 1 submitter; last evaluated 2021-06-29). AlphaMissense: likely benign (0.2065); Absent from gnomAD v4.1; Associated with primary ciliary dyskinesia.

What condition is associated with DRC1 p.Ser656Phe (c.1967C>T)?

DRC1 p.Ser656Phe (c.1967C>T) is associated with primary ciliary dyskinesia (ClinVar).

How common is DRC1 p.Ser656Phe (c.1967C>T) in the general population?

DRC1 p.Ser656Phe (c.1967C>T) is absent from gnomAD v4.1 (gnomAD).

How is Primary ciliary dyskinesia inherited?

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

What do computational predictors say about DRC1 p.Ser656Phe (c.1967C>T)?

AlphaMissense predicts likely benign (score 0.2065) — an in-silico prediction, not a clinical call.

DRC1 p.Ser656Phe

c.1967C>T · rs2148007712 · VCV1464111

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2065 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

primary ciliary dyskinesia

Computational evidence

Protein change
AlphaMissense	0.2065	likely benign
REVEL	0.105	moderately benign-leaning
SaProt	LLR -11.84	damaging
⇒ SaProt calls this damaging; AlphaMissense and REVEL do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.5	GERP 0.42, phastCons 0.95
Regional constraint	o/e 0.99	unconstrained · MANE · 55 kb · p 0.71 · regional, not allelic
Overall
CADD	18.93	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: DRC1
Protein: p.Ser656Phe
Coding: c.1967C>T
MANE Select: NM_145038
dbSNP: rs2148007712
Type: single nucleotide variant
Location: chr2:26454694 (GRCh38)
Gene constraint: LOEUF 0.867 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 75.44 · 1 PDB
Residue 656: a UniProt-annotated variant site (in cild21; multiple flagellar abnormalities are present in patient sperm); a UniProt-annotated variant site (in spgf80; no protein detected in a homozygous patient sperm); a UniProt-annotated variant site (in spgf80); a UniProt-annotated variant site (in cild21)

Full DRC1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

primary ciliary dyskinesia — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Primary ciliary dyskinesia (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive, X-linked recessive
Onset: Neonatal
Prevalence: 1-5 / 10 000 (Pakistan)

Similar variants

DRC1 p.Gln118Ter Pathogenic/Likely pathogenic ★★ same condition
DRC1 p.Gln337Ter Pathogenic/Likely pathogenic ★★ same condition
DRC1 p.Ser642Ter Pathogenic/Likely pathogenic ★★ same condition
DRC1 p.Ala250Val Uncertain significance ★★ ⚠ same condition
DRC1 p.Ala391Val Uncertain significance ★★ ⚠ same condition
DRC1 p.Ala416Gly Uncertain significance ★★ ⚠ same condition
DRC1 p.Ala45Val Uncertain significance ★★ ⚠ same condition
DRC1 p.Ala473Val 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/drc1-p-ser656phe (accessed [today's date]).

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