rs386834123

chr8-1771232-GAGA-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM4_Supporting PP5

The NM_018941.4(CLN8):c.181_183del(p.Lys61del) variant causes a inframe deletion change involving the alteration of a conserved nucleotide. Variant has been reported in ClinVar as Likely pathogenic (no stars). Synonymous variant affecting the same amino acid position (i.e. E60E) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CLN8 NM_018941.4 inframe_deletion
• Clinical Significance: Pathogenic/Likely pathogenic no assertion criteria provided P:2
• Conservation: PhyloP100: 8.40

Genes affected

CLN8 (HGNC:2079): (CLN8 transmembrane ER and ERGIC protein) This gene encodes a transmembrane protein belonging to a family of proteins containing TLC domains, which are postulated to function in lipid synthesis, transport, or sensing. The protein localizes to the endoplasmic reticulum (ER), and may recycle between the ER and ER-Golgi intermediate compartment. Mutations in this gene are associated with a disorder characterized by progressive epilepsy with cognitive disabilities (EPMR), which is a subtype of neuronal ceroid lipofuscinoses (NCL). Patients with mutations in this gene have altered levels of sphingolipid and phospholipids in the brain. [provided by RefSeq, Jul 2017]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a chain Protein CLN8 (size 285) in uniprot entity CLN8_HUMAN there are 49 pathogenic changes around while only 20 benign (71%) in NM_018941.4
• PM4: Nonframeshift variant in NON repetitive region in NM_018941.4. Strenght limited to Supporting due to length of the change: 1aa.
• PP5: Variant 8-1771232-GAGA-G is Pathogenic according to our data. Variant chr8-1771232-GAGA-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 56703.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr8-1771232-GAGA-G is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CLN8	NM_018941.4	c.181_183del	p.Lys61del	inframe_deletion	2/3	ENST00000331222.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CLN8	ENST00000331222.6	c.181_183del	p.Lys61del	inframe_deletion	2/3	1	NM_018941.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: no assertion criteria provided

Submissions by phenotype

Neuronal ceroid lipofuscinosis 8 Pathogenic:2

Pathogenic, no assertion criteria provided	literature only	OMIM	Jul 01, 2009	- -
Likely pathogenic, no assertion criteria provided	literature only	Juha Muilu Group; Institute for Molecular Medicine Finland (FIMM)	-	- -

Computational scores

Source: dbNSFP v4.3

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: rs386834123; hg19: chr8-1719398;