NM_018941.4:c.374A>G

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS1

The NM_018941.4(CLN8):c.374A>G(p.Asn125Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00118 in 1,614,122 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N125I) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00084 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0012 ( 0 hom. )

Consequence

CLN8
NM_018941.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:9B:5O:1

Conservation

PhyloP100: 1.30

Publications

10 publications found

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 Gene-Disease associations (from GenCC):

neuronal ceroid lipofuscinosis
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
neuronal ceroid lipofuscinosis 8
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet, Myriad Women’s Health, Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
neuronal ceroid lipofuscinosis 8 northern epilepsy variant
Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet
autism spectrum disorder
Inheritance: AD Classification: NO_KNOWN Submitted by: Ambry Genetics

CLN8 links:

KBTBD11-OT1 (HGNC:):

KBTBD11-OT1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.011771888).

BP6

Variant 8-1771428-A-G is Benign according to our data. Variant chr8-1771428-A-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 205207.

BS1

Variant frequency is greater than expected in population sas. GnomAdExome4 allele frequency = 0.00122 (1778/1461890) while in subpopulation SAS AF = 0.00213 (184/86258). AF 95% confidence interval is 0.00188. There are 0 homozygotes in GnomAdExome4. There are 920 alleles in the male GnomAdExome4 subpopulation. Median coverage is 32. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_018941.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CLN8	NM_018941.4	MANE Select	c.374A>G	p.Asn125Ser	missense	Exon 2 of 3	NP_061764.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
CLN8	ENST00000331222.6	TSL:1 MANE Select	c.374A>G	p.Asn125Ser	missense	Exon 2 of 3	ENSP00000328182.4	Q9UBY8
KBTBD11-OT1	ENST00000635855.1	TSL:5	n.374A>G		non_coding_transcript_exon	Exon 2 of 30	ENSP00000489726.1	A0A1B0GTJ5
CLN8	ENST00000519254.2	TSL:5	c.374A>G	p.Asn125Ser	missense	Exon 2 of 3	ENSP00000490016.1	Q9UBY8

Frequencies

GnomAD3 genomes

AF:

0.000841

AC:

128

AN:

152112

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000362

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00124

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00166

Gnomad FIN

AF:

0.0000944

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00122

Gnomad OTH

AF:

0.000959

GnomAD2 exomes

AF:

0.000974

AC:

245

AN:

251482

AF XY:

0.00118

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.000925

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad FIN exome

AF:

0.000185

Gnomad NFE exome

AF:

0.00117

Gnomad OTH exome

AF:

0.000651

GnomAD4 exome

AF:

0.00122

AC:

1778

AN:

1461890

Hom.:

Cov.:

AF XY:

0.00127

AC XY:

920

AN XY:

727248

show subpopulations

African (AFR)

AF:

0.000149

AC:

AN:

33480

American (AMR)

AF:

0.000961

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.0000383

AC:

AN:

26136

East Asian (EAS)

AF:

0.0000504

AC:

AN:

39700

South Asian (SAS)

AF:

0.00213

AC:

184

AN:

86258

European-Finnish (FIN)

AF:

0.000150

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00191

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00132

AC:

1463

AN:

1112008

Other (OTH)

AF:

0.00101

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

119

239

358

478

597

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

116

174

232

290

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000841

AC:

128

AN:

152232

Hom.:

Cov.:

AF XY:

0.000766

AC XY:

AN XY:

74414

show subpopulations

African (AFR)

AF:

0.000361

AC:

AN:

41570

American (AMR)

AF:

0.00124

AC:

AN:

15296

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5160

South Asian (SAS)

AF:

0.00166

AC:

AN:

4820

European-Finnish (FIN)

AF:

0.0000944

AC:

AN:

10594

Middle Eastern (MID)

AF:

0.00

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.00122

AC:

AN:

68010

Other (OTH)

AF:

0.000949

AC:

AN:

2108

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.502

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00113

Hom.:

Bravo

AF:

0.000956

TwinsUK

AF:

0.000539

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.00105

AC:

ExAC

AF:

0.000815

AC:

Asia WGS

AF:

0.00173

AC:

AN:

3478

EpiCase

AF:

0.00120

EpiControl

AF:

0.00136

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Neuronal ceroid lipofuscinosis 8 (5)

not provided (4)

Neuronal ceroid lipofuscinosis (2)

not specified (2)

Inborn genetic diseases (1)

Intellectual disability (1)

Neuronal ceroid lipofuscinosis 8;C1864923:Neuronal ceroid lipofuscinosis 8 northern epilepsy variant (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.055

BayesDel_addAF

Benign

-0.46

BayesDel_noAF

Benign

-0.44

CADD

Benign

0.61

(source)

DANN

Benign

0.42

DEOGEN2

Uncertain

0.47

Eigen

Benign

-0.94

Eigen_PC

Benign

-0.99

FATHMM_MKL

Benign

0.29

LIST_S2

Benign

0.74

M_CAP

Uncertain

0.11

MetaRNN

Benign

0.012

MetaSVM

Benign

-0.52

MutationAssessor

Benign

1.7

PhyloP100

1.3

PrimateAI

Benign

0.31

PROVEAN

Benign

-0.96

REVEL

Benign

0.28

Sift

Benign

0.28

Sift4G

Uncertain

0.016

Polyphen

0.034

Vest4

0.71

MVP

0.81

MPC

0.035

ClinPred

0.0090

GERP RS

-0.080

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.022

gMVP

0.25

Mutation Taster

=96/4

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over