Is MCPH1 p.Pro439Ser (c.1315C>T) pathogenic?

MCPH1 p.Pro439Ser (c.1315C>T) is classified Uncertain significance in MCPH1 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-01-16). AlphaMissense: likely benign (0.0958); Ultra-rare (popmax 0.0253%, sas); Associated with Inborn genetic diseases.

What condition is associated with MCPH1 p.Pro439Ser (c.1315C>T)?

MCPH1 p.Pro439Ser (c.1315C>T) is associated with Inborn genetic diseases (ClinVar).

How common is MCPH1 p.Pro439Ser (c.1315C>T) in the general population?

MCPH1 p.Pro439Ser (c.1315C>T) is ultra-rare (popmax 0.0253%, sas) (gnomAD).

What do computational predictors say about MCPH1 p.Pro439Ser (c.1315C>T)?

AlphaMissense predicts likely benign (score 0.0958) — an in-silico prediction, not a clinical call.

MCPH1 p.Pro439Ser

c.1315C>T · VCV3871365

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0958 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0253%, sas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.0958	likely benign
REVEL	0.086	moderately benign-leaning
SaProt	LLR -5.87	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.3	GERP 0.2, phastCons 0.011
Regional constraint	o/e 1.49	unconstrained · MANE · 236 kb · p 2.4e-54 · regional, not allelic
Overall
CADD	19.41	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 0.0253% South Asian · 23/91,082 alleles

Filtering AF 0.0172% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0146%

Overall 0.00198% 29/1,461,860 alleles · ultra-rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0253%	3,960
Remaining individualsnot grpmax-eligible	0.0032%	31,254
European (non-Finnish)	0.000339%	295,004

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: MCPH1
Protein: p.Pro439Ser
Coding: c.1315C>T
MANE Select: NM_024596
Type: single nucleotide variant
Location: chr8:6445037 (GRCh38)
Gene constraint: LOEUF 1.342 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 59.80 · 9 PDB
Residue 439: the 'disordered' region

Full MCPH1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

MCPH1 c.1935+6T>C Uncertain significance ★★ same condition
MCPH1 p.Ala401Val Uncertain significance ★★ ⚠ same condition
MCPH1 p.Ala404Val Uncertain significance ★★ ⚠ same condition
MCPH1 p.Arg373Thr Uncertain significance ★★ ⚠ same condition
MCPH1 p.Arg379Ile Uncertain significance ★★ ⚠ same condition
MCPH1 p.Arg703His Uncertain significance ★★ ⚠ same condition
MCPH1 p.Arg785Trp Uncertain significance ★★ ⚠ same condition
MCPH1 p.Asp758Asn 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/mcph1-p-pro439ser (accessed [today's date]).

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