Is CHPF p.Arg71Cys (c.211C>T) pathogenic?

CHPF p.Arg71Cys (c.211C>T) is classified Uncertain significance in CHPF (ClinVar, Single submitter, 1 submitter; last evaluated 2025-03-20). AlphaMissense: ambiguous (0.4339); Very rare (popmax 0.0014%, afr).

How common is CHPF p.Arg71Cys (c.211C>T) in the general population?

CHPF p.Arg71Cys (c.211C>T) is very rare (popmax 0.0014%, afr) (gnomAD).

What do computational predictors say about CHPF p.Arg71Cys (c.211C>T)?

AlphaMissense predicts ambiguous (score 0.4339) — an in-silico prediction, not a clinical call.

CHPF p.Arg71Cys

c.211C>T · VCV4002498

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.4339 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.0014%, afr)

Missense predictors

1/2 damaging

REVEL, SaProt · AlphaMissense no call

Computational evidence

Protein change
AlphaMissense	0.4339	ambiguous
REVEL	0.066	moderately benign-leaning
SaProt	LLR -10.52	damaging
⇒ SaProt calls this damaging; REVEL does not; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 11	GERP 1.4, phastCons 1
Regional constraint	o/e 0.88	unconstrained · MANE · 4,044 bp · p 0.00017 · regional, not allelic
Overall
CADD	27.0	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

Grpmax group 0.0014% African / African-American · 1/71,326 alleles

Filtering AF 0.000362% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000262%

Overall 0.00108% 17/1,571,336 alleles · very rare

Ancestry group	Frequency	1 in
Amishnot grpmax-eligible	0.658%	152
Remaining individualsnot grpmax-eligible	0.00164%	61,030
African / African-Americangrpmax	0.0014%	71,326
European (non-Finnish)	0.00077%	129,852

Amish 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: CHPF
Protein: p.Arg71Cys
Coding: c.211C>T
MANE Select: NM_024536
Type: single nucleotide variant
Location: chr2:219543328 (GRCh38)
Gene constraint: LOEUF 0.954 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 85.57 · 2 PDB
Residue 71: the 'disordered' region

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

Similar variants

CHPF p.Glu699= Benign ★★ same type
CHPF p.Ser48Pro Benign/Likely benign ★★ same type
CHPF p.Ala206Ser Uncertain significance ★ ⚠ same type
CHPF p.Ala286Val Uncertain significance ★ ⚠ same type
CHPF p.Ala341Thr Uncertain significance ★ ⚠ same type
CHPF p.Ala343Gly Uncertain significance ★ ⚠ same type
CHPF p.Ala516Val Uncertain significance ★ ⚠ same type
CHPF p.Ala530Gly Uncertain significance ★ ⚠ same type

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/chpf-p-arg71cys (accessed [today's date]).

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