Is TFRC p.Ile74= (c.222C>T) pathogenic?

TFRC p.Ile74= (c.222C>T) is classified Likely benign in TFRC (ClinVar, Single submitter, 1 submitter; last evaluated 2023-07-14). Very rare (popmax 0.0011%, sas).

How common is TFRC p.Ile74= (c.222C>T) in the general population?

TFRC p.Ile74= (c.222C>T) is very rare (popmax 0.0011%, sas) (gnomAD).

TFRC p.Ile74=

c.222C>T · rs745734170 · VCV1605801

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.0011%, sas)

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Splicing
SpliceAI	Δ0.42	donor gain · deltas
Pangolin	Δ0.34	loss · gain 0.26 · SpliceAI calls gain · independent
Constraint at this position
Conservation	phyloP 2	GERP 1.7, phastCons 0.98
Overall
CADD	15.32	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0011% South Asian · 1/91,070 alleles

Filtering AF 0.000124% ClinGen BA1/BS1 input FAF95, joint · FAF99 9e-05%

Overall 0.000372% 6/1,613,408 alleles · very rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0011%	91,070
European (non-Finnish)	0.000424%	235,954

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: TFRC
Protein: p.Ile74=
Coding: c.222C>T
MANE Select: NM_001128148
dbSNP: rs745734170
Type: single nucleotide variant
Location: chr3:196075175 (GRCh38)
Gene constraint: LOEUF 0.489 · pLI 0.98 (gnomAD)
Structure: AlphaFold pLDDT 86.87 · 24 PDB

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

Similar variants

TFRC c.1678-3C>T Uncertain significance ★★ same type
TFRC p.Ala166Val Uncertain significance ★★ ⚠ same type
TFRC p.Ala196Thr Uncertain significance ★★ ⚠ same type
TFRC p.Ala293Thr Uncertain significance ★★ ⚠ same type
TFRC p.Ala540Val Uncertain significance ★★ ⚠ same type
TFRC p.Ala72Ser Uncertain significance ★★ ⚠ same type
TFRC p.Arg155His Uncertain significance ★★ ⚠ same type
TFRC p.Arg155Pro 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/tfrc-p-ile74 (accessed [today's date]).

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