rs797044999

Positions:

• chr10-93797547-C-T

Variant summary

Our verdict is Pathogenic. Variant got 15 ACMG points: 15P and 0B. PM2 PP2 PP3_Strong PP5_Very_Strong

The NM_005097.4(LGI1):​c.1418C>T​(p.Ser473Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,830 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: LGI1 NM_005097.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2 O:1
• Conservation: PhyloP100: 7.91

Genes affected

LGI1 (HGNC:6572): (leucine rich glioma inactivated 1) This gene encodes a member of the secreted leucine-rich repeat (LRR) superfamily and shares homology with members of the SLIT protein family. The encoded protein may regulate the activity of voltage-gated potassium channels and may be involved in neuronal growth regulation and cell survival. This gene is rearranged as a result of translocations in glioblastoma cell lines, and it is frequently down-regulated or rearranged in malignant gliomas. Mutations in this gene result in autosomal dominant lateral temporal epilepsy. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Apr 2015]

LGI1 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 15 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), LGI1. . Gene score misZ 2.7809 (greater than the threshold 3.09). Trascript score misZ 3.4769 (greater than threshold 3.09). GenCC has associacion of gene with epilepsy, familial temporal lobe, 1, autosomal dominant epilepsy with auditory features.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.967
• PP5: Variant 10-93797547-C-T is Pathogenic according to our data. Variant chr10-93797547-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 208480.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LGI1	NM_005097.4	c.1418C>T	p.Ser473Leu	missense_variant	8/8	ENST00000371418.9	NP_005088.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LGI1	ENST00000371418.9	c.1418C>T	p.Ser473Leu	missense_variant	8/8	1	NM_005097.4	ENSP00000360472.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461830 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727218

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Autosomal dominant epilepsy with auditory features Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 17, 2023

This variant is not present in population databases (gnomAD no frequency). This sequence change replaces serine, which is neutral and polar, with leucine, which is neutral and non-polar, at codon 473 of the LGI1 protein (p.Ser473Leu). This missense change has been observed in individuals with autosomal dominant lateral temporal lobe epilepsy (PMID: 15079010, 19780791). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 208480). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt LGI1 protein function. Experimental studies have shown that this missense change affects LGI1 function (PMID: 25485908, 27760137). In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Seizure Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Génétique des Maladies du Développement, Hospices Civils de Lyon

Nov 27, 2023

- -

Epilepsy, familial temporal lobe, 1 Other:1

not provided, no classification provided

literature only

GeneReviews

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.94
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.37
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.95	D;.;.;T
Eigen	Pathogenic	0.73
Eigen_PC	Uncertain	0.64
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D;D;D
M_CAP	Uncertain	0.19	D
MetaRNN	Pathogenic	0.97	D;D;D;D
MetaSVM	Uncertain	0.48	D
MutationAssessor	Pathogenic	2.9	M;.;.;.
PrimateAI	Uncertain	0.72	T
PROVEAN	Pathogenic	-5.1	D;.;.;.
REVEL	Pathogenic	0.89
Sift	Pathogenic	0.0	D;.;.;.
Sift4G	Pathogenic	0.0	D;D;D;.
Polyphen		1.0	D;.;D;.
Vest4		0.80
MutPred		0.88		Loss of disorder (P = 0.0034);.;.;.;
MVP		0.95
MPC		1.7
ClinPred		1.0	D
GERP RS		5.2
Varity_R		0.96
gMVP		0.89

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs797044999; hg19: chr10-95557304; COSMIC: COSV65058124; COSMIC: COSV65058124;