rs1554907767

Positions:

• chr10-93797285-G-GAAATAGTCAGA

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PVS1_Strong PM2 PP5_Moderate

The NM_005097.4(LGI1):​c.1158_1168dupAATAGTCAGAA​(p.Thr390fs) variant causes a frameshift, stop gained change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: LGI1 NM_005097.4 frameshift, stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.42

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 Likely_pathogenic. Variant got 8 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.302 CDS is truncated, and there are 2 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 10-93797285-G-GAAATAGTCAGA is Pathogenic according to our data. Variant chr10-93797285-G-GAAATAGTCAGA is described in ClinVar as [Pathogenic]. Clinvar id is 533337.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
LGI1	NM_005097.4	c.1158_1168dupAATAGTCAGAA	p.Thr390fs	frameshift_variant, stop_gained	8/8	ENST00000371418.9	NP_005088.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
LGI1	ENST00000371418.9	c.1158_1168dupAATAGTCAGAA	p.Thr390fs	frameshift_variant, stop_gained	8/8	1	NM_005097.4	ENSP00000360472.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Autosomal dominant epilepsy with auditory features Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 06, 2020

For these reasons, this variant has been classified as Pathogenic. A different truncation (p.Ile547Asnfs*8) that lies downstream of this variant has been determined to be likely pathogenic (PMID: 11810107, 18711109, 15857855). This suggests that deletion of this region of the LGI1 protein is causative of disease. This variant has not been reported in the literature in individuals with LGI1-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change results in a premature translational stop signal in the LGI1 gene (p.Thr390Lysfs*2). While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 168 amino acids of the LGI1 protein. -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1554907767; hg19: chr10-95557042;