Is CHKB c.818+7C>T pathogenic?

CHKB c.818+7C>T is classified Likely benign in CHKB (ClinVar, Single submitter, 1 submitter; last evaluated 2023-04-07). Absent from gnomAD v4.1; Associated with megaconial type congenital muscular dystrophy.

What condition is associated with CHKB c.818+7C>T?

CHKB c.818+7C>T is associated with megaconial type congenital muscular dystrophy (ClinVar).

How common is CHKB c.818+7C>T in the general population?

CHKB c.818+7C>T is absent from gnomAD v4.1 (gnomAD).

How is Megaconial congenital muscular dystrophy inherited?

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

CHKB c.818+7C>T

rs2070654627 · VCV2868948

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

megaconial type congenital muscular dystrophy

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
Splice region	donor +7	near-intronic (+7 nt from the splice site) · inside the BP7-excluded zone
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.84	GERP -3.4
Non-coding constraint	Z 2.30	1 kb window · o/e 0.85 · regional · uncalibrated
Overall
CADD	4.429	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: CHKB
Coding: c.818+7C>T
MANE Select: NM_005198
dbSNP: rs2070654627
Type: single nucleotide variant
Location: chr22:50580183 (GRCh38)
Gene constraint: LOEUF 1.015 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 86.54 · 3 PDB

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

Disease context

megaconial type congenital muscular dystrophy — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Megaconial congenital muscular dystrophy (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

CHKB p.Gln51Ter Pathogenic/Likely pathogenic ★★ same condition
CHKB c.*208T>G Uncertain significance ★★ same condition
CHKB p.Ala361Val Uncertain significance ★★ ⚠ same condition
CHKB p.Arg344Trp Uncertain significance ★★ ⚠ same condition
CHKB p.Arg62Cys Uncertain significance ★★ ⚠ same condition
CHKB p.Gln309Glu Uncertain significance ★★ ⚠ same condition
CHKB p.Glu214Asp Uncertain significance ★★ ⚠ same condition
CHKB p.Glu336Lys 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/chkb-c-818-plus-7c-t (accessed [today's date]).

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