15-68218634-C-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_017882.3(CLN6):c.100G>A(p.Ala34Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000253 in 1,613,306 control chromosomes in the GnomAD database, including 1 homozygotes. 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 Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00016 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00026 ( 1 hom. )

Consequence

CLN6
NM_017882.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: -0.179

Publications

7 publications found

Variant links:

Genes affected

CLN6 (HGNC:2077): (CLN6 transmembrane ER protein) This gene is one of eight which have been associated with neuronal ceroid lipofuscinoses (NCL). Also referred to as Batten disease, NCL comprises a class of autosomal recessive, neurodegenerative disorders affecting children. The genes responsible likely encode proteins involved in the degradation of post-translationally modified proteins in lysosomes. The primary defect in NCL disorders is thought to be associated with lysosomal storage function. [provided by RefSeq, Oct 2008]

CLN6 Gene-Disease associations (from GenCC):

ceroid lipofuscinosis, neuronal, 6A
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Laboratory for Molecular Medicine, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), G2P, Myriad Women’s Health, Orphanet
ceroid lipofuscinosis, neuronal, 6B (Kufs type)
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, G2P, Orphanet
neuronal ceroid lipofuscinosis
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen

CLN6 links:

ENSG00000260007 (HGNC:):

ENSG00000260007 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.04939428).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_017882.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CLN6	NM_017882.3	MANE Select	c.100G>A	p.Ala34Thr	missense	Exon 2 of 7	NP_060352.1
	CLN6	NM_001411068.1		c.196G>A	p.Ala66Thr	missense	Exon 2 of 7	NP_001397997.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
CLN6	ENST00000249806.11	TSL:1 MANE Select	c.100G>A	p.Ala34Thr	missense	Exon 2 of 7	ENSP00000249806.5
CLN6	ENST00000637667.1	TSL:1	c.100G>A	p.Ala34Thr	missense	Exon 2 of 6	ENSP00000489843.1
CLN6	ENST00000566347.5	TSL:1	c.100G>A	p.Ala34Thr	missense	Exon 2 of 6	ENSP00000457783.1

Frequencies

GnomAD3 genomes

AF:

0.000158

AC:

AN:

152110

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000338

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000235

AC:

AN:

251170

AF XY:

0.000243

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000931

Gnomad NFE exome

AF:

0.000440

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000263

AC:

384

AN:

1461196

Hom.:

Cov.:

AF XY:

0.000242

AC XY:

176

AN XY:

726906

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33462

American (AMR)

AF:

0.0000224

AC:

AN:

44710

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26126

East Asian (EAS)

AF:

0.00

AC:

AN:

39684

South Asian (SAS)

AF:

0.0000696

AC:

AN:

86238

European-Finnish (FIN)

AF:

0.0000751

AC:

AN:

53228

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.000324

AC:

360

AN:

1111624

Other (OTH)

AF:

0.000215

AC:

AN:

60362

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.447

Heterozygous variant carriers

104

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

100

<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:

0.000158

AC:

AN:

152110

Hom.:

Cov.:

AF XY:

0.000148

AC XY:

AN XY:

74300

show subpopulations

African (AFR)

AF:

0.0000242

AC:

AN:

41400

American (AMR)

AF:

0.00

AC:

AN:

15274

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5190

South Asian (SAS)

AF:

0.00

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

314

European-Non Finnish (NFE)

AF:

0.000338

AC:

AN:

68020

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.492

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:

0.000309

Hom.:

Bravo

AF:

0.000159

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000778

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000239

AC:

EpiCase

AF:

0.000491

EpiControl

AF:

0.000296

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Aug 25, 2017

Eurofins Ntd Llc (ga)

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Jul 12, 2024

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Reported in an individual with Kufs disease type B; however a second variant was not identified in CLN6 and authors suggested A34T may be non-pathogenic (PMID: 21549341); In silico analysis indicates that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 21549341)

Neuronal ceroid lipofuscinosis

Uncertain:2

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance.

Aug 29, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 34 of the CLN6 protein (p.Ala34Thr). This variant is present in population databases (rs146198681, gnomAD 0.04%). This missense change has been observed in individual(s) with Kufs disease type B (adult neuronal ceroid lipofuscinosis) (PMID: 21549341). ClinVar contains an entry for this variant (Variation ID: 205152). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The threonine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

not specified

Uncertain:1

May 02, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: CLN6 c.100G>A (p.Ala34Thr) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00023 in 251170 control chromosomes (gnomAD). This frequency is not significantly higher than estimated for a pathogenic variant in CLN6 causing Neuronal Ceroid-Lipofuscinosis (Batten Disease) (0.00023 vs 0.0011), allowing no conclusion about variant significance. c.100G>A has been reported in the literature in a heterozygous individual affected with Kufs disease type B (Arsov_2011). This report does not provide unequivocal conclusions about association of the variant with Neuronal Ceroid-Lipofuscinosis (Batten Disease). To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publication has been ascertained in the context of this evaluation (PMID: 21549341). ClinVar contains an entry for this variant (Variation ID: 205152). Based on the evidence outlined above, the variant was classified as uncertain significance.

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.069

BayesDel_addAF

Benign

-0.31

BayesDel_noAF

Benign

-0.36

CADD

Benign

6.3

(source)

DANN

Benign

0.94

DEOGEN2

Uncertain

0.60

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.1

FATHMM_MKL

Benign

0.18

LIST_S2

Benign

0.70

M_CAP

Benign

0.074

MetaRNN

Benign

0.049

MetaSVM

Benign

-0.44

MutationAssessor

Benign

0.55

PhyloP100

-0.18

PrimateAI

Uncertain

0.55

PROVEAN

Benign

-1.1

REVEL

Benign

0.20

Sift

Benign

0.28

Sift4G

Benign

0.51

Polyphen

0.0030

Vest4

0.064

MVP

0.73

MPC

0.29

ClinPred

0.043

GERP RS

3.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.3

Varity_R

0.023

gMVP

0.41

Mutation Taster

=85/15

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over