Is LMNB2 p.Ser426= (c.1278C>T) pathogenic?

LMNB2 p.Ser426= (c.1278C>T) is classified Likely benign in LMNB2 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2023-12-23). Very rare (popmax 0.00802%, afr); Associated with progressive myoclonic epilepsy type 9.

What condition is associated with LMNB2 p.Ser426= (c.1278C>T)?

LMNB2 p.Ser426= (c.1278C>T) is associated with progressive myoclonic epilepsy type 9, lipodystrophy, partial, acquired, susceptibility to (ClinVar).

How common is LMNB2 p.Ser426= (c.1278C>T) in the general population?

LMNB2 p.Ser426= (c.1278C>T) is very rare (popmax 0.00802%, afr) (gnomAD).

How is Progressive myoclonic epilepsy type 9 inherited?

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

LMNB2 p.Ser426=

c.1278C>T · rs202012198 · VCV586126

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00802%, afr)

Conditions

progressive myoclonic epilepsy type 9

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.72	GERP -3.8
Overall
CADD	5.518	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00802% African / African-American · 6/74,850 alleles

Filtering AF 0.00347% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00229%

Overall 0.00256% 41/1,603,636 alleles · very rare exomes 34/1,451,278 · genomes 7/152,358 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00802%	12,475
South Asian	0.00553%	18,076
European (non-Finnish)	0.00246%	40,570
Remaining individualsnot grpmax-eligible	0.00161%	62,000

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: LMNB2
Protein: p.Ser426=
Coding: c.1278C>T
MANE Select: NM_032737
dbSNP: rs202012198
Type: single nucleotide variant
Location: chr19:2434030 (GRCh38)
Gene constraint: LOEUF 0.399 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 79.82 · 2 PDB
Residue 426: the 'disordered' region; the 'tail' region; a modified residue (phosphoserine)

Full LMNB2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

progressive myoclonic epilepsy type 9 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: lipodystrophy, partial, acquired, susceptibility to

For Progressive myoclonic epilepsy type 9 (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood

Similar variants

LMNB2 c.1202+5G>A Uncertain significance ★★ same condition
LMNB2 p.Ala178Thr Uncertain significance ★★ ⚠ same condition
LMNB2 p.Ala299Val Uncertain significance ★★ ⚠ same condition
LMNB2 p.Ala29Pro Uncertain significance ★★ ⚠ same condition
LMNB2 p.Ala567Thr Uncertain significance ★★ ⚠ same condition
LMNB2 p.Arg104Gly Uncertain significance ★★ ⚠ same condition
LMNB2 p.Arg114His Uncertain significance ★★ ⚠ same condition
LMNB2 p.Arg148Cys 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/lmnb2-p-ser426 (accessed [today's date]).

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