chr16-28477557-G-C

Position:

• chr16-28477557-G-C

Variant summary

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

The NM_001042432.2(CLN3):​c.1276C>G​(p.Leu426Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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 (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: CLN3 NM_001042432.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.123

Genes affected

CLN3 (HGNC:2074): (CLN3 lysosomal/endosomal transmembrane protein, battenin) This gene encodes a protein that is involved in lysosomal function. Mutations in this, as well as other neuronal ceroid-lipofuscinosis (CLN) genes, cause neurodegenerative diseases commonly known as Batten disease or collectively known as neuronal ceroid lipofuscinoses (NCLs). Many alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Jul 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=0.2280733).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CLN3	NM_001042432.2	c.1276C>G	p.Leu426Val	missense_variant	16/16	ENST00000636147.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CLN3	ENST00000636147.2	c.1276C>G	p.Leu426Val	missense_variant	16/16	1	NM_001042432.2	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

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

Sep 11, 2021

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. 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 valine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. This variant has not been reported in the literature in individuals affected with CLN3-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces leucine with valine at codon 426 of the CLN3 protein (p.Leu426Val). The leucine residue is moderately conserved and there is a small physicochemical difference between leucine and valine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.082
BayesDel_addAF	Uncertain	0.060	T
BayesDel_noAF	Benign	-0.15
CADD	Benign	5.6
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.60	D;D;.;.;T;.;.;T;D;T;.;T;.;.
Eigen	Benign	-0.64
Eigen_PC	Benign	-0.54
FATHMM_MKL	Benign	0.46	N
LIST_S2	Benign	0.81	.;.;T;.;.;T;T;T;.;T;T;T;.;T
M_CAP	Uncertain	0.099	D
MetaRNN	Benign	0.23	T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	0.075	D
MutationAssessor	Benign	1.3	L;L;.;.;.;.;.;.;L;.;.;.;.;.
MutationTaster	Benign	0.86	D;D;D;D;D;D;D;D;D;D;D;N
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-1.1	.;N;.;.;N;N;N;N;N;.;N;.;.;N
REVEL	Benign	0.29
Sift	Benign	0.14	.;T;.;.;T;T;T;T;T;.;T;.;.;T
Sift4G	Benign	0.32	.;.;T;.;T;T;T;.;T;.;T;.;.;.
Polyphen		0.0040	B;B;.;.;B;.;.;.;B;B;B;B;.;B
Vest4		0.24, 0.25, 0.28, 0.27, 0.24, 0.33
MutPred		0.65		Gain of glycosylation at S423 (P = 0.0969);Gain of glycosylation at S423 (P = 0.0969);.;.;.;.;.;.;Gain of glycosylation at S423 (P = 0.0969);.;.;.;.;.;
MVP		0.75
MPC		0.16
ClinPred		0.11	T
GERP RS		-1.1
Varity_R		0.085
gMVP		0.48

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: rs1596619187; hg19: chr16-28488878;