chr15-68209731-T-C

Position:

• chr15-68209731-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_017882.3(CLN6):​c.571A>G​(p.Met191Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,404 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CLN6 NM_017882.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.47

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]

ACMG classification

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=0.13718048).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CLN6	NM_017882.3	c.571A>G	p.Met191Val	missense_variant	6/7	ENST00000249806.11	NP_060352.1
CLN6	NM_001411068.1	c.667A>G	p.Met223Val	missense_variant	6/7		NP_001397997.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CLN6	ENST00000249806.11	c.571A>G	p.Met191Val	missense_variant	6/7	1	NM_017882.3	ENSP00000249806	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461404 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727018

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Neuronal ceroid lipofuscinosis Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 27, 2021

This sequence change replaces methionine with valine at codon 191 of the CLN6 protein (p.Met191Val). The methionine residue is moderately conserved and there is a small physicochemical difference between methionine and valine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals affected with CLN6-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. 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	0.096
BayesDel_addAF	Uncertain	0.072	D
BayesDel_noAF	Benign	-0.13
CADD	Benign	20
DANN	Benign	0.93
DEOGEN2	Uncertain	0.66	D;T;T;.;T;T
Eigen	Benign	-0.46
Eigen_PC	Benign	-0.29
FATHMM_MKL	Uncertain	0.84	D
LIST_S2	Benign	0.84	T;T;T;T;T;T
M_CAP	Benign	0.068	D
MetaRNN	Benign	0.14	T;T;T;T;T;T
MetaSVM	Uncertain	-0.022	T
MutationAssessor	Benign	1.1	L;.;.;.;.;.
MutationTaster	Benign	0.60	D;D;D;D;D;D
PrimateAI	Benign	0.42	T
PROVEAN	Benign	-1.3	N;N;N;N;.;.
REVEL	Benign	0.26
Sift	Benign	0.14	T;T;T;T;.;.
Sift4G	Benign	0.22	T;T;T;T;.;.
Polyphen		0.0	B;.;.;.;.;.
Vest4		0.35
MutPred		0.30		.;.;.;Gain of catalytic residue at M223 (P = 0.0573);.;.;
MVP		0.74
MPC		0.31
ClinPred		0.25	T
GERP RS		3.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.068
gMVP		0.60

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

Other links and lift over

dbSNP: rs1555438435; hg19: chr15-68502069;