rs138821993

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 4P and 16B. PM1PM2BP4_StrongBP6_Very_StrongBS1

The NM_018941.4(CLN8):c.725C>T(p.Thr242Met) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000127 in 1,614,216 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. T242T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00013 ( 1 hom. )

Consequence

CLN8
NM_018941.4 missense

Scores

Clinical Significance

Likely benign criteria provided, multiple submitters, no conflicts U:1B:3

Conservation

PhyloP100: 7.37

Variant links:

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]

CLN8 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -12 ACMG points.

PM1

In a domain TLC (size 200) in uniprot entity CLN8_HUMAN there are 39 pathogenic changes around while only 14 benign (74%) in NM_018941.4

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.050075352).

BP6

Variant 8-1780431-C-T is Benign according to our data. Variant chr8-1780431-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 205195.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population eas. gnomad4_exome allele frequency = 0.000129 (188/1461892) while in subpopulation EAS AF= 0.00305 (121/39700). AF 95% confidence interval is 0.00261. There are 1 homozygotes in gnomad4_exome. There are 102 alleles in male gnomad4_exome subpopulation. Median coverage is 32. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CLN8	NM_018941.4 linkuse as main transcript	c.725C>T	p.Thr242Met	missense_variant	3/3	ENST00000331222.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CLN8	ENST00000331222.6 linkuse as main transcript	c.725C>T	p.Thr242Met	missense_variant	3/3	1	NM_018941.4	P1

Frequencies

GnomAD3 genomes

AF:

0.000118

AC:

AN:

152206

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00308

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000398

AC:

100

AN:

251490

Hom.:

AF XY:

0.000427

AC XY:

AN XY:

135920

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00468

Gnomad SAS exome

AF:

0.000359

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000129

AC:

188

AN:

1461892

Hom.:

Cov.:

AF XY:

0.000140

AC XY:

102

AN XY:

727248

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00305

Gnomad4 SAS exome

AF:

0.000580

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000270

Gnomad4 OTH exome

AF:

0.000199

GnomAD4 genome

AF:

0.000112

AC:

AN:

152324

Hom.:

Cov.:

AF XY:

0.000161

AC XY:

AN XY:

74474

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00290

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.0000430

Hom.:

Bravo

AF:

0.000181

ExAC

AF:

0.000453

AC:

ClinVar

Significance: Likely benign

Submissions summary: Uncertain:1Benign:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Neuronal ceroid lipofuscinosis

Uncertain:1Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Invitae	Jan 31, 2024	- -
Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Jan 17, 2020	- -

CLN8-related disorder

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Mar 16, 2022

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

not provided

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Mar 25, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.60

BayesDel_addAF

Uncertain

0.13

BayesDel_noAF

Pathogenic

0.41

Cadd

Uncertain

Dann

Uncertain

1.0

DEOGEN2

Uncertain

0.67

D;D;D;D;D

Eigen

Uncertain

0.59

Eigen_PC

Uncertain

0.49

FATHMM_MKL

Pathogenic

0.98

M_CAP

Uncertain

0.20

MetaRNN

Benign

0.050

T;T;T;T;T

MetaSVM

Pathogenic

0.82

MutationAssessor

Uncertain

2.6

M;M;M;M;M

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.55

PROVEAN

Uncertain

-2.5

N;.;.;.;.

REVEL

Uncertain

0.63

Sift

Uncertain

0.0010

D;.;.;.;.

Sift4G

Uncertain

0.0020

D;.;.;.;.

Polyphen

1.0

D;D;D;D;D

Vest4

0.79

MVP

0.99

MPC

0.29

ClinPred

0.14

GERP RS

5.2

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.19

gMVP

0.74

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over