Is MORC2 p.Pro75Ser (c.223C>T) pathogenic?

MORC2 p.Pro75Ser (c.223C>T) is classified Uncertain significance in MORC2 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2023-10-14). AlphaMissense: likely benign (0.0988); Ultra-rare (popmax 0.0133%, afr); Associated with Charcot-Marie-Tooth disease axonal type 2Z.

What condition is associated with MORC2 p.Pro75Ser (c.223C>T)?

MORC2 p.Pro75Ser (c.223C>T) is associated with Charcot-Marie-Tooth disease axonal type 2Z (ClinVar).

How common is MORC2 p.Pro75Ser (c.223C>T) in the general population?

MORC2 p.Pro75Ser (c.223C>T) is ultra-rare (popmax 0.0133%, afr) (gnomAD).

What do computational predictors say about MORC2 p.Pro75Ser (c.223C>T)?

AlphaMissense predicts likely benign (score 0.0988) — an in-silico prediction, not a clinical call.

MORC2 p.Pro75Ser

Q: How is Autosomal dominant Charcot-Marie-Tooth disease type 2Z inherited?

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

c.223C>T · rs898196410 · VCV2766221

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.0988 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0133%, afr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Charcot-Marie-Tooth disease axonal type 2Z

Computational evidence

Protein change
AlphaMissense	0.0988	likely benign
REVEL	0.28	benign-leaning
SaProt	LLR -8.05	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 3.2	GERP -3.6, phastCons 1
Regional constraint	o/e 0.79	unconstrained · MANE · 8,864 bp · p 0.081 · regional, not allelic
Overall
CADD	17.6	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0133% African / African-American · 8/60,100 alleles

Filtering AF 0.00661% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00482%

Overall 0.000613% 9/1,467,482 alleles · ultra-rare exomes 4/1,350,042 · genomes 5/117,440 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0133%	7,513
Admixed American	0.00198%	50,410

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: MORC2
Protein: p.Pro75Ser
Coding: c.223C>T
MANE Select: NM_001303256
dbSNP: rs898196410
Type: single nucleotide variant
Location: chr22:30950380 (GRCh38)
Gene constraint: LOEUF 0.3 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 78.37 · 9 PDB
Residue 75: an α-helix

Full MORC2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Charcot-Marie-Tooth disease axonal type 2Z — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Autosomal dominant Charcot-Marie-Tooth disease type 2Z (Orphanet):

Inheritance: Autosomal dominant
Onset: Adolescent, Adult, Childhood, Infancy, Neonatal

Similar variants

MORC2 p.Arg132Cys Pathogenic/Likely pathogenic ★★ same condition
MORC2 p.Arg252Trp Pathogenic/Likely pathogenic ★★ same condition
MORC2 p.Arg266Ser Pathogenic/Likely pathogenic ★★ same condition
MORC2 p.Asp466Asn Pathogenic/Likely pathogenic ★★ ⚠ same condition
MORC2 p.Glu236Gly Pathogenic/Likely pathogenic ★★ same condition
MORC2 p.Glu27Lys Pathogenic/Likely pathogenic ★★ ⚠ same condition
MORC2 p.Ser87Leu Pathogenic ★★ same condition
MORC2 p.Thr24Ile 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/morc2-p-pro75ser (accessed [today's date]).

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