15-68229521-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_017882.3(CLN6):c.64G>A(p.Ala22Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000355 in 1,466,290 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A22S) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 34)

Exomes 𝑓: 0.000037 ( 0 hom. )

Consequence

CLN6
NM_017882.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 0.119

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 links:

ENSG00000260007 (HGNC:):

ENSG00000260007 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.12779781).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CLN6	NM_017882.3 link	c.64G>A	p.Ala22Thr	missense_variant	Exon 1 of 7	ENST00000249806.11	NP_060352.1	Q9NWW5-1A0A024R601
CLN6	NM_001411068.1 link	c.180-10871G>A		intron_variant	Intron 1 of 6		NP_001397997.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CLN6	ENST00000249806.11 link	c.64G>A	p.Ala22Thr	missense_variant	Exon 1 of 7	1	NM_017882.3	ENSP00000249806.5		Q9NWW5-1
ENSG00000260007	ENST00000562767.2 link	c.64G>A	p.Ala22Thr	missense_variant	Exon 1 of 3	3		ENSP00000456336.1		H3BRN7

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

151988

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:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000498

AC:

AN:

80346

Hom.:

AF XY:

0.0000870

AC XY:

AN XY:

45980

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000276

Gnomad SAS exome

AF:

0.0000592

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000686

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000373

AC:

AN:

1314302

Hom.:

Cov.:

AF XY:

0.0000417

AC XY:

AN XY:

647994

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000274

Gnomad4 FIN exome

AF:

0.0000307

Gnomad4 NFE exome

AF:

0.0000392

Gnomad4 OTH exome

AF:

0.0000922

GnomAD4 genome

AF:

0.0000197

AC:

AN:

151988

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74250

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000441

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000151

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Jun 21, 2017

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

p.Ala22Thr (GCC>ACC): c.64 G>A in exon 1 of the CLN6 gene (NM_017882.2). The Ala22Thr missense change has not been published as a mutation, nor has it been reported as a benign polymorphism to our knowledge. Ala22Thr alters a position that is not conserved in the signal peptide domain of the CLN6 protein and several in-silico algorithms predict it may be benign. However, other missense mutations in this region of the protein have been reported in association with late-infantile neuronal ceroid lipofuscinosis (NCL) and the amino acid substitution is non-conservative as a non-polar Alanine residue is replaced by a polar Threonine residue. Therefore, based on the currently available information, it is unclear whether Ala22Thr is a disease-causing mutation or a rare benign variant. The variant is found in EPILEPSY panel(s). -

Neuronal ceroid lipofuscinosis

Uncertain:1

Apr 05, 2024

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 22 of the CLN6 protein (p.Ala22Thr). This variant is present in population databases (no rsID available, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with CLN6-related conditions. ClinVar contains an entry for this variant (Variation ID: 205181). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt CLN6 protein function with a negative predictive value of 80%. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Benign

-0.19

BayesDel_noAF

Benign

-0.21

CADD

Benign

DANN

Uncertain

0.99

DEOGEN2

Benign

0.11

.;T;T;T;T;T;.;.

Eigen

Benign

-0.95

Eigen_PC

Benign

-0.96

FATHMM_MKL

Benign

0.40

LIST_S2

Benign

0.82

T;T;T;T;T;T;T;T

M_CAP

Pathogenic

0.80

MetaRNN

Benign

0.13

T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.33

MutationAssessor

Benign

1.4

.;L;.;.;.;.;.;.

PrimateAI

Uncertain

0.75

PROVEAN

Uncertain

-4.0

D;N;N;N;.;.;N;.

REVEL

Benign

0.12

Sift

Benign

0.069

.;T;D;T;.;.;D;.

Sift4G

Pathogenic

0.0

D;T;D;T;.;.;T;.

Polyphen

0.46

.;P;.;.;.;.;.;.

Vest4

0.11

MutPred

0.24

Loss of helix (P = 0.0167);Loss of helix (P = 0.0167);Loss of helix (P = 0.0167);Loss of helix (P = 0.0167);Loss of helix (P = 0.0167);Loss of helix (P = 0.0167);Loss of helix (P = 0.0167);Loss of helix (P = 0.0167);

MVP

0.55

MPC

0.084

ClinPred

0.079

GERP RS

1.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.065

gMVP

0.27

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

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