Is F5 p.Cys1907= (c.5721T>C) pathogenic?

F5 p.Cys1907= (c.5721T>C) is classified Conflicting classifications of pathogenicity in F5 (ClinVar, Conflicting submitters, 2 submitters; last evaluated 2025-10-14). Very rare (popmax 0.000509%, nfe); Associated with Budd-Chiari syndrome.

What condition is associated with F5 p.Cys1907= (c.5721T>C)?

F5 p.Cys1907= (c.5721T>C) is associated with Budd-Chiari syndrome, thrombophilia due to thrombin defect, congenital factor V deficiency (ClinVar).

How common is F5 p.Cys1907= (c.5721T>C) in the general population?

F5 p.Cys1907= (c.5721T>C) is very rare (popmax 0.000509%, nfe) (gnomAD).

How is Budd-Chiari syndrome inherited?

Typically Multigenic/multifactorial (Orphanet). A genetic counselor can assess individual risk for a family.

F5 p.Cys1907=

c.5721T>C · rs886045543 · VCV293578

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.000509%, nfe)

Conditions

Budd-Chiari syndrome

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 0.44	GERP -1.5, phastCons 0.76
Overall
CADD	2.29	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000509% European (non-Finnish) · 6/1,178,914 alleles

Filtering AF 0.000183% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00012%

Overall 0.000434% 7/1,612,770 alleles · very rare exomes 7/1,460,506 · genomes 0/152,264 · joint denominator

Ancestry group	Frequency	1 in
Remaining individualsnot grpmax-eligible	0.0016%	62,438
European (non-Finnish)grpmax	0.000509%	196,486

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: F5
Protein: p.Cys1907=
Coding: c.5721T>C
MANE Select: NM_000130
dbSNP: rs886045543
Type: single nucleotide variant
Location: chr1:169524904 (GRCh38)
Gene constraint: LOEUF 0.704 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 62.57 · 23 PDB
Residue 1907: a disulfide bond; the f5/8 type a 3 domain; the plastocyanin-like 6 domain; the f5/8 type c 1 domain

Full F5 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Budd-Chiari syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: thrombophilia due to thrombin defect congenital factor V deficiency factor V deficiency

For Budd-Chiari syndrome (Orphanet):

Inheritance: Multigenic/multifactorial
Onset: All ages
Prevalence: 1-9 / 100 000 (Europe)

Similar variants

F5 p.Cys1907Arg Uncertain significance ★ ⚠ same residue
F5 c.1297-2A>G Pathogenic/Likely pathogenic ★★ same condition
F5 p.Arg1030Ter Pathogenic ★★ same condition
F5 p.Arg146Ter Pathogenic/Likely pathogenic ★★ same condition
F5 p.Arg1621Ter Pathogenic/Likely pathogenic ★★ same condition
F5 p.Arg1634Ter Pathogenic/Likely pathogenic ★★ same condition
F5 p.Arg2102His Pathogenic/Likely pathogenic ★★ same condition
F5 p.Arg740Ter Pathogenic/Likely pathogenic ★★ 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/f5-p-cys1907 (accessed [today's date]).

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