Is PGAP1 c.147+9C>T pathogenic?

PGAP1 c.147+9C>T is classified Likely benign in PGAP1 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-09-24). Very rare (popmax 0.00167%, amr); Associated with intellectual disability, autosomal recessive 42.

What condition is associated with PGAP1 c.147+9C>T?

PGAP1 c.147+9C>T is associated with intellectual disability, autosomal recessive 42 (ClinVar).

How common is PGAP1 c.147+9C>T in the general population?

PGAP1 c.147+9C>T is very rare (popmax 0.00167%, amr) (gnomAD).

PGAP1 c.147+9C>T

VCV4769997

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00167%, amr)

Conditions

intellectual disability, autosomal recessive 42

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
Splice region	donor +9	near-intronic (+9 nt from the splice site)
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 0.39	GERP -1, phastCons 0.42
Non-coding constraint	Z -2.36	1 kb window · o/e 1.18 · regional · uncalibrated
Overall
CADD	16.48	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00167% Admixed American · 1/59,970 alleles

Filtering AF 7.9e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 5.4e-05%

Overall 0.00415% 67/1,613,720 alleles · very rare exomes 56/1,461,588 · genomes 11/152,132 · joint denominator

Ancestry group	Frequency	1 in
Ashkenazi Jewishnot grpmax-eligible	0.189%	528
Remaining individualsnot grpmax-eligible	0.008%	12,493
Admixed Americangrpmax	0.00167%	59,970
African / African-American	0.00134%	74,870
European (non-Finnish)	0.000339%	294,969

Ashkenazi Jewish shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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: PGAP1
Coding: c.147+9C>T
MANE Select: NM_024989
Type: single nucleotide variant
Location: chr2:196926461 (GRCh38)
Gene constraint: LOEUF 0.691 · pLI 0.02 (gnomAD)
Structure: AlphaFold pLDDT 89.15

Full PGAP1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

intellectual disability, autosomal recessive 42 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

PGAP1 p.Gln466Ter Pathogenic ★★ same condition
PGAP1 p.Gln555Ter Pathogenic/Likely pathogenic ★★ same condition
PGAP1 p.Tyr758Ter Pathogenic/Likely pathogenic ★★ same condition
PGAP1 p.Ala298Thr Uncertain significance ★★ ⚠ same condition
PGAP1 p.Ala714Val Uncertain significance ★★ ⚠ same condition
PGAP1 p.Arg231Gln Uncertain significance ★★ ⚠ same condition
PGAP1 p.Arg250His Uncertain significance ★★ ⚠ same condition
PGAP1 p.Arg803Cys 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/pgap1-c-147-plus-9c-t (accessed [today's date]).

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