Is CTRC p.Ser256= (c.768C>T) pathogenic?

CTRC p.Ser256= (c.768C>T) is classified Likely benign in CTRC (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-11-25). Very rare (popmax 0.00445%, eas); Associated with hereditary chronic pancreatitis.

What condition is associated with CTRC p.Ser256= (c.768C>T)?

CTRC p.Ser256= (c.768C>T) is associated with hereditary chronic pancreatitis (ClinVar).

How common is CTRC p.Ser256= (c.768C>T) in the general population?

CTRC p.Ser256= (c.768C>T) is very rare (popmax 0.00445%, eas) (gnomAD).

CTRC p.Ser256=

Q: How is Autosomal dominant hereditary chronic pancreatitis inherited?

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

c.768C>T · rs778166573 · VCV707479

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00445%, eas)

Conditions

hereditary chronic pancreatitis

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 -7.8	GERP -5.2
Overall
CADD	7.772	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00445% East Asian · 2/44,902 alleles

Filtering AF 0.00326% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00294%

Overall 0.00353% 57/1,614,040 alleles · very rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00445%	22,451
European (non-Finnish)	0.00424%	23,601
Remaining individualsnot grpmax-eligible	0.0032%	31,245
South Asian	0.0022%	45,545
Admixed American	0.00167%	60,006

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: CTRC
Protein: p.Ser256=
Coding: c.768C>T
MANE Select: NM_007272
dbSNP: rs778166573
Type: single nucleotide variant
Location: chr1:15445725 (GRCh38)
Gene constraint: LOEUF 1.147 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 94.03 · 1 PDB
Residue 256: the peptidase s1 domain; an α-helix

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

Disease context

hereditary chronic pancreatitis — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Autosomal dominant hereditary chronic pancreatitis (Orphanet):

Inheritance: Autosomal dominant
Onset: Adolescent, Childhood
Prevalence: 1-9 / 1 000 000 (France)

Similar variants

CTRC p.Ser256Cys Uncertain significance ★★ ⚠ same residue
CTRC c.494-1G>C Pathogenic/Likely pathogenic ★★ same condition
CTRC p.Arg29Ter Pathogenic/Likely pathogenic ★★ same condition
CTRC p.Gln174Ter Pathogenic/Likely pathogenic ★★ same condition
CTRC c.356+1G>A Uncertain significance ★★ same condition
CTRC c.40+4A>G Uncertain significance ★★ same condition
CTRC c.40+6C>T Uncertain significance ★★ same condition
CTRC p.Ala12Val 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/ctrc-p-ser256 (accessed [today's date]).

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