Is DNAI2 p.Arg263Ter (c.787C>T) pathogenic?

DNAI2 p.Arg263Ter (c.787C>T) is classified Pathogenic in DNAI2 (ClinVar, Multiple submitters, 5 submitters; last evaluated 2025-12-03). Very rare (popmax 0.00659%, sas); Associated with primary ciliary dyskinesia.

What condition is associated with DNAI2 p.Arg263Ter (c.787C>T)?

DNAI2 p.Arg263Ter (c.787C>T) is associated with primary ciliary dyskinesia, primary ciliary dyskinesia 9 (ClinVar).

How common is DNAI2 p.Arg263Ter (c.787C>T) in the general population?

DNAI2 p.Arg263Ter (c.787C>T) is very rare (popmax 0.00659%, sas) (gnomAD).

How is Primary ciliary dyskinesia inherited?

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

DNAI2 p.Arg263Ter

c.787C>T · rs137852998 · VCV4955

Pathogenic Multiple submitters

Classification

Pathogenic

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 5 submitters

Consequence

nonsense (stop-gain)

predicted LoF

gnomAD v4.1

Rare

very rare (popmax 0.00659%, sas)

Conditions

primary ciliary dyskinesia

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	nonsense (stop-gain)	predicted loss-of-function
NMD	predicted	premature termination codon in exon 7 of 14
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.6	GERP 1.8, phastCons 1
Overall
CADD	48.0	PHRED · no single calibrated threshold — expert panels disagree

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00659% South Asian · 6/91,068 alleles

Filtering AF 0.00286% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00195%

Overall 0.00136% 22/1,613,298 alleles · very rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.00659%	15,178
African / African-American	0.00534%	18,720
Admixed American	0.00167%	59,972
Remaining individualsnot grpmax-eligible	0.0016%	62,484
European (non-Finnish)	0.000847%	118,002

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: DNAI2
Protein: p.Arg263Ter
Coding: c.787C>T
MANE Select: NM_023036
dbSNP: rs137852998
Type: single nucleotide variant
Location: chr17:74299780 (GRCh38)
Gene constraint: LOEUF 0.966 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 84.27 · 1 PDB

Full DNAI2 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

Also linked: primary ciliary dyskinesia 9

For Primary ciliary dyskinesia (Orphanet):

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

Similar variants

DNAI2 p.Arg263Gly Uncertain significance ★★ ⚠ same residue
DNAI2 p.Arg263Gln Uncertain significance ★ ⚠ same residue
DNAI2 c.1348-1G>A Likely pathogenic ★★ same condition
DNAI2 c.1494+1G>A Pathogenic/Likely pathogenic ★★ same condition
DNAI2 c.1494+1G>T Pathogenic/Likely pathogenic ★★ same condition
DNAI2 c.1495-2A>T Likely pathogenic ★★ same condition
DNAI2 c.346-3T>G Pathogenic/Likely pathogenic ★★ same condition
DNAI2 c.610+1G>A Pathogenic/Likely 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/dnai2-p-arg263ter (accessed [today's date]).

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