Is PRDM16 p.Pro221= (c.663G>A) pathogenic?

PRDM16 p.Pro221= (c.663G>A) is classified Likely benign in PRDM16 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-08-25). Very rare (popmax 0.00176%, amr); Associated with left ventricular noncompaction 8.

What condition is associated with PRDM16 p.Pro221= (c.663G>A)?

PRDM16 p.Pro221= (c.663G>A) is associated with left ventricular noncompaction 8 (ClinVar).

How common is PRDM16 p.Pro221= (c.663G>A) in the general population?

PRDM16 p.Pro221= (c.663G>A) is very rare (popmax 0.00176%, amr) (gnomAD).

How is Left ventricular noncompaction inherited?

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

PRDM16 p.Pro221=

c.663G>A · rs780898226 · VCV1598550

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00176%, amr)

Conditions

left ventricular noncompaction 8

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 -3.7	GERP -4
Overall
CADD	1.945	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00176% Admixed American · 1/56,938 alleles

Filtering AF 0.000186% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000122%

Overall 0.000506% 8/1,580,624 alleles · very rare exomes 8/1,428,328 · genomes 0/152,296 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00176%	56,938
South Asian	0.00115%	87,012
European (non-Finnish)	0.000517%	193,264

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: PRDM16
Protein: p.Pro221=
Coding: c.663G>A
MANE Select: NM_022114
dbSNP: rs780898226
Type: single nucleotide variant
Location: chr1:3396580 (GRCh38)
Gene constraint: LOEUF 0.304 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 51.73 · 2 PDB

Full PRDM16 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

left ventricular noncompaction 8 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Left ventricular noncompaction (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive, Mitochondrial inheritance
Onset: All ages

Similar variants

PRDM16 c.388-2A>G Uncertain significance ★★ same condition
PRDM16 p.Ala1035Ser Uncertain significance ★★ ⚠ same condition
PRDM16 p.Ala106Thr Uncertain significance ★★ ⚠ same condition
PRDM16 p.Ala1096Thr Uncertain significance ★★ ⚠ same condition
PRDM16 p.Ala1096Val Uncertain significance ★★ ⚠ same condition
PRDM16 p.Ala1146Thr Uncertain significance ★★ ⚠ same condition
PRDM16 p.Ala175Val Uncertain significance ★★ ⚠ same condition
PRDM16 p.Ala34Val 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/prdm16-p-pro221 (accessed [today's date]).

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