Is MBD5 p.Ala609= (c.1827C>T) pathogenic?

MBD5 p.Ala609= (c.1827C>T) is classified Likely benign in MBD5 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-07-27). Very rare (popmax 0.00401%, afr); Associated with intellectual disability, autosomal dominant 1.

What condition is associated with MBD5 p.Ala609= (c.1827C>T)?

MBD5 p.Ala609= (c.1827C>T) is associated with intellectual disability, autosomal dominant 1 (ClinVar).

How common is MBD5 p.Ala609= (c.1827C>T) in the general population?

MBD5 p.Ala609= (c.1827C>T) is very rare (popmax 0.00401%, afr) (gnomAD).

MBD5 p.Ala609=

c.1827C>T · rs761655364 · VCV703295

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00401%, afr)

Conditions

intellectual disability, autosomal dominant 1

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.279	benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.3	GERP -1.2, phastCons 1
Overall
CADD	13.12	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00401% African / African-American · 3/74,882 alleles

Filtering AF 0.00106% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000495%

Overall 0.000868% 14/1,613,792 alleles · very rare exomes 12/1,461,670 · genomes 2/152,122 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00401%	24,961
Admixed American	0.00334%	29,980
East Asian	0.00223%	44,888
South Asian	0.0011%	91,076
European (non-Finnish)	0.000593%	168,556

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: MBD5
Protein: p.Ala609=
Coding: c.1827C>T
MANE Select: NM_001378120
dbSNP: rs761655364
Type: single nucleotide variant
Location: chr2:148469770 (GRCh38)
Gene constraint: LOEUF 0.161 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 43.20
Residue 609: the 'disordered' region

Full MBD5 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

intellectual disability, autosomal dominant 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

MBD5 c.397+1G>A Pathogenic ★★ same condition
MBD5 c.397+2T>C Pathogenic ★★ same condition
MBD5 p.Arg1440Ter Pathogenic ★★ same condition
MBD5 p.Arg200Ter Pathogenic ★★ same condition
MBD5 p.Arg325Ter Pathogenic/Likely pathogenic ★★ same condition
MBD5 p.Cys60Ter Pathogenic ★★ same condition
MBD5 p.Gln587Ter Pathogenic ★★ same condition
MBD5 p.Gln813Ter 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/mbd5-p-ala609 (accessed [today's date]).

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