8-1780391-C-G

Position:

chr8-1780391-C-G

Variant summary

Our verdict is Benign. Variant got -18 ACMG points: 2P and 20B. PM1BP4_StrongBP6_Very_StrongBA1

The NM_018941.4(CLN8):c.685C>G(p.Pro229Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00428 in 1,614,224 control chromosomes in the GnomAD database, including 435 homozygotes. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P229L) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0089 ( 76 hom., cov: 33)

Exomes 𝑓: 0.0038 ( 359 hom. )

Consequence

CLN8
NM_018941.4 missense

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts U:1B:11

Conservation

PhyloP100: 2.13

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 -18 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

BP4

Computational evidence support a benign effect (MetaRNN=0.0029430985).

BP6

Variant 8-1780391-C-G is Benign according to our data. Variant chr8-1780391-C-G is described in ClinVar as [Benign]. Clinvar id is 95924.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr8-1780391-C-G is described in Lovd as [Likely_pathogenic]. Variant chr8-1780391-C-G is described in Lovd as [Likely_benign].

BA1

GnomAd4 highest subpopulation (AMR) allele frequency at 95% confidence interval = 0.0789 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CLN8	NM_018941.4 linkuse as main transcript	c.685C>G	p.Pro229Ala	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.685C>G	p.Pro229Ala	missense_variant	3/3	1	NM_018941.4	P1

Frequencies

GnomAD3 genomes

AF:

0.00890

AC:

1355

AN:

152212

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00157

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0827

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000162

Gnomad OTH

AF:

0.00716

GnomAD3 exomes

AF:

0.0174

AC:

4373

AN:

251492

Hom.:

305

AF XY:

0.0131

AC XY:

1780

AN XY:

135922

show subpopulations

Gnomad AFR exome

AF:

0.00135

Gnomad AMR exome

AF:

0.124

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.000229

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000703

Gnomad OTH exome

AF:

0.0101

GnomAD4 exome

AF:

0.00379

AC:

5547

AN:

1461894

Hom.:

359

Cov.:

AF XY:

0.00320

AC XY:

2328

AN XY:

727248

show subpopulations

Gnomad4 AFR exome

AF:

0.000777

Gnomad4 AMR exome

AF:

0.118

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000290

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000432

Gnomad4 OTH exome

AF:

0.00262

GnomAD4 genome

AF:

0.00891

AC:

1357

AN:

152330

Hom.:

Cov.:

AF XY:

0.0105

AC XY:

785

AN XY:

74488

show subpopulations

Gnomad4 AFR

AF:

0.00156

Gnomad4 AMR

AF:

0.0827

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000162

Gnomad4 OTH

AF:

0.00709

Alfa

AF:

0.00105

Hom.:

Bravo

AF:

0.0155

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00113

AC:

ESP6500EA

AF:

0.000698

AC:

ExAC

AF:

0.0115

AC:

1397

Asia WGS

AF:

0.00346

AC:

AN:

3478

EpiCase

AF:

0.0000545

EpiControl

AF:

0.0000593

ClinVar

Significance: Benign

Submissions summary: Uncertain:1Benign:11

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:4

Benign, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jun 19, 2014	- -
Likely benign, no assertion criteria provided	clinical testing	Genetic Services Laboratory, University of Chicago	-	Likely benign based on allele frequency in 1000 Genomes Project or ESP global frequency and its presence in a patient with a rare or unrelated disease phenotype. NOT Sanger confirmed. -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Mar 10, 2020	- -

not provided

Uncertain:1Benign:2

Uncertain significance, no assertion criteria provided	clinical testing	Mayo Clinic Laboratories, Mayo Clinic	Dec 15, 2015	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Dec 11, 2018	This variant is associated with the following publications: (PMID: 27535533, 21990111) -
Benign, criteria provided, single submitter	clinical testing	Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics	May 10, 2016	- -

Neuronal ceroid lipofuscinosis 8

Benign:2

Benign, criteria provided, single submitter	clinical testing	Counsyl	Dec 28, 2017	- -
Benign, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -

Inborn genetic diseases

Benign:1

Benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 25, 2016

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Central core myopathy

Benign:1

Benign, criteria provided, single submitter

research

Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard

The homozygous p.Pro229Ala variant in CLN8 has been identified in 1 Mexican and 1 Argentinian individual with late infantile neuronal ceroid lipofuscinosis (PMID: 21990111). However, this variant is classified as benign for autosomal recessive neuronal ceroid lipofuscinosis because it has been identified in >5% of Latino chromosomes and 93 total homozygotes by ExAC (http://gnomad.broadinstitute.org/). -

Neuronal ceroid lipofuscinosis

Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Feb 01, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Benign

-0.35

BayesDel_noAF

Benign

-0.17

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.48

T;T;T;T;T

Eigen

Benign

-0.35

Eigen_PC

Benign

-0.38

FATHMM_MKL

Benign

0.54

MetaRNN

Benign

0.0029

T;T;T;T;T

MetaSVM

Benign

-0.79

MutationAssessor

Uncertain

2.5

M;M;M;M;M

MutationTaster

Benign

1.0

PrimateAI

Benign

0.28

PROVEAN

Benign

-0.98

N;.;.;.;.

REVEL

Uncertain

0.35

Sift

Benign

0.27

T;.;.;.;.

Sift4G

Benign

1.0

T;.;.;.;.

Polyphen

0.56

P;P;P;P;P

Vest4

0.050

MPC

0.14

ClinPred

0.0047

GERP RS

3.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.041

gMVP

0.68

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