Is CSF3R p.Arg74fs (c.218dup) pathogenic?

CSF3R p.Arg74fs (c.218dup) is classified Pathogenic in CSF3R (ClinVar, Single submitter, 2 submitters; last evaluated 2024-11-06). Very rare (popmax 0.000678%, nfe); Associated with autosomal recessive severe congenital neutropenia due to CSF3R deficiency.

What condition is associated with CSF3R p.Arg74fs (c.218dup)?

CSF3R p.Arg74fs (c.218dup) is associated with autosomal recessive severe congenital neutropenia due to CSF3R deficiency (ClinVar).

How common is CSF3R p.Arg74fs (c.218dup) in the general population?

CSF3R p.Arg74fs (c.218dup) is very rare (popmax 0.000678%, nfe) (gnomAD).

CSF3R p.Arg74fs

Q: How is Autosomal recessive severe congenital neutropenia due to CSF3R deficiency inherited?

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

c.218dup · rs765536522 · VCV1410136

Pathogenic Single submitter

Classification

Pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 2 submitters

Consequence

frameshift

predicted LoF

gnomAD v4.1

Rare

very rare (popmax 0.000678%, nfe)

Conditions

autosomal recessive severe congenital neutropenia due to CSF3R deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function
NMD	predicted	premature termination codon in exon 4 of 17
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP -0.59	GERP -3.5
Overall
CADD	19.3	PHRED · no single calibrated threshold — expert panels disagree

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000678% European (non-Finnish) · 8/1,179,882 alleles

Filtering AF 0.000292% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000211%

Overall 0.000558% 9/1,613,862 alleles · very rare

Ancestry group	Frequency	1 in
Remaining individualsnot grpmax-eligible	0.0016%	62,478
European (non-Finnish)grpmax	0.000678%	147,485

Remaining individuals 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: CSF3R
Protein: p.Arg74fs
Coding: c.218dup
MANE Select: NM_000760
dbSNP: rs765536522
Type: Duplication
Location: chr1:36475519 (GRCh38)
Gene constraint: LOEUF 0.726 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 74.29 · 1 PDB
Residue 74: a disulfide bond; the ig-like c2-type domain

Full CSF3R gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

autosomal recessive severe congenital neutropenia due to CSF3R deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Autosomal recessive severe congenital neutropenia due to CSF3R deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

CSF3R p.Met231fs Pathogenic ★ same condition
CSF3R p.Ser238fs Pathogenic ★ same condition
CSF3R p.Val406fs Pathogenic ★ same condition
CSF3R c.1071+1_1071+5dup Uncertain significance ★ same condition
CSF3R c.2041-164_2132dup Uncertain significance ★ same condition
CSF3R p.Gln730fs Uncertain significance ★ same condition
CSF3R p.Leu639_Thr640insLeu Uncertain significance ★ same condition
CSF3R c.998-18_998-17dup Likely benign ★ 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/csf3r-p-arg74fs (accessed [today's date]).

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