Is PARN p.Ala306Val (c.917C>T) pathogenic?

PARN p.Ala306Val (c.917C>T) is classified Uncertain significance in PARN (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-12-29). AlphaMissense: likely benign (0.0707); Ultra-rare (popmax 0.0278%, nfe); Associated with dyskeratosis congenita, autosomal recessive 6.

What condition is associated with PARN p.Ala306Val (c.917C>T)?

PARN p.Ala306Val (c.917C>T) is associated with dyskeratosis congenita, autosomal recessive 6, pulmonary fibrosis and/or bone marrow failure, Telomere-related, 4 (ClinVar).

How common is PARN p.Ala306Val (c.917C>T) in the general population?

PARN p.Ala306Val (c.917C>T) is ultra-rare (popmax 0.0278%, nfe) (gnomAD).

How is Dyskeratosis congenita inherited?

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

What do computational predictors say about PARN p.Ala306Val (c.917C>T)?

AlphaMissense predicts likely benign (score 0.0707) — an in-silico prediction, not a clinical call.

PARN p.Ala306Val

c.917C>T · rs201362263 · VCV844990

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.0707 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0278%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

dyskeratosis congenita, autosomal recessive 6

Computational evidence

Protein change
AlphaMissense	0.0707	likely benign
REVEL	0.028	moderately benign-leaning
SaProt	LLR -4.88	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.7	GERP -2.6, phastCons 0.29
Regional constraint	o/e 1.03	unconstrained · MANE · 193 kb · p 0.44 · regional, not allelic
Overall
CADD	20.1	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0278% European (non-Finnish) · 310/1,116,628 alleles

Filtering AF 0.0252% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0241%

Overall 0.0211% 325/1,543,808 alleles · ultra-rare exomes 314/1,392,014 · genomes 11/151,794 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0278%	3,602
Remaining individualsnot grpmax-eligible	0.00666%	15,023
African / African-American	0.00545%	18,349
East Asian	0.00449%	22,283
South Asian	0.00447%	22,378
Admixed American	0.00168%	59,660

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: PARN
Protein: p.Ala306Val
Coding: c.917C>T
MANE Select: NM_002582
dbSNP: rs201362263
Type: single nucleotide variant
Location: chr16:14593302 (GRCh38)
Gene constraint: LOEUF 0.918 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 81.60 · 3 PDB

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

Disease context

dyskeratosis congenita, autosomal recessive 6 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: pulmonary fibrosis and/or bone marrow failure, Telomere-related, 4

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

PARN p.Ala306= Uncertain significance ★★ same residue
PARN c.1006-2A>G Pathogenic/Likely pathogenic ★★ same condition
PARN c.1405+1G>T Likely pathogenic ★★ same condition
PARN c.1481-1G>A Pathogenic/Likely pathogenic ★★ same condition
PARN c.178-1G>C Likely pathogenic ★★ same condition
PARN c.784-1G>A Likely pathogenic ★★ same condition
PARN c.962+2T>C Pathogenic/Likely pathogenic ★★ same condition
PARN p.Arg128Ter 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/parn-p-ala306val (accessed [today's date]).

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