Is SRCAP p.Thr884Ile (c.2651C>T) pathogenic?

SRCAP p.Thr884Ile (c.2651C>T) is classified Uncertain significance in SRCAP (ClinVar, Multiple submitters, 3 submitters; last evaluated 2024-04-05). AlphaMissense: likely pathogenic (0.977); Ultra-rare (popmax 0.0401%, eas); Associated with developmental delay, hypotonia, musculoskeletal defects, and behavioral abnormalities.

How common is SRCAP p.Thr884Ile (c.2651C>T) in the general population?

SRCAP p.Thr884Ile (c.2651C>T) is ultra-rare (popmax 0.0401%, eas) (gnomAD).

What do computational predictors say about SRCAP p.Thr884Ile (c.2651C>T)?

AlphaMissense predicts likely pathogenic (score 0.977) — an in-silico prediction, not a clinical call.

SRCAP p.Thr884Ile

Q: What condition is associated with SRCAP p.Thr884Ile (c.2651C>T)?

SRCAP p.Thr884Ile (c.2651C>T) is associated with developmental delay, hypotonia, musculoskeletal defects, and behavioral abnormalities, Floating-Harbor syndrome (ClinVar).

c.2651C>T · rs748447295 · VCV281494

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely pathogenic

0.977 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0401%, eas)

Conditions

developmental delay, hypotonia, musculoskeletal defects, and behavioral abnormalities

Computational evidence

Protein change
AlphaMissense	0.977	likely pathogenic
REVEL	0.537	indeterminate
SaProt	—	not scored · why
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 6	GERP 2.7, phastCons 1
Regional constraint	o/e 0.69	unconstrained · MANE · 4,608 bp · p 6.7e-06 · regional, not allelic
Overall
CADD	24.4	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL is an independent agreement signal.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0401% East Asian · 18/44,898 alleles

Filtering AF 0.0258% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0213%

Overall 0.00143% 23/1,614,030 alleles · ultra-rare exomes 17/1,461,880 · genomes 6/152,150 · joint denominator

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0401%	2,494
African / African-American	0.00534%	18,726
South Asian	0.0011%	91,086

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: SRCAP
Protein: p.Thr884Ile
Coding: c.2651C>T
MANE Select: NM_006662
dbSNP: rs748447295
Type: single nucleotide variant
Location: chr16:30716313 (GRCh38)
Gene constraint: LOEUF 0.223 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Residue 884: a UniProt-annotated variant site (in dehmba)

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

Disease context

developmental delay, hypotonia, musculoskeletal defects, and behavioral abnormalities — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: Floating-Harbor syndrome

Similar variants

SRCAP p.Arg2329Ter Pathogenic/Likely pathogenic ★★ same condition
SRCAP p.Arg2435Ter Pathogenic/Likely pathogenic ★★ same condition
SRCAP p.Arg2444Ter Pathogenic ★★ same condition
SRCAP p.Arg2718Ter Pathogenic/Likely pathogenic ★★ same condition
SRCAP p.Arg2748Ter Pathogenic ★★ same condition
SRCAP p.Gln2407Ter Pathogenic ★★ same condition
SRCAP p.Gln2419Ter Pathogenic ★★ same condition
SRCAP p.Gln2665Ter 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/srcap-p-thr884ile (accessed [today's date]).

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