chr16-28486454-T-TC

Variant names:

• chr16-28486454-T-TC
• rs386833732
• NM_001042432.2:c.569dupG

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_001042432.2(CLN3):​c.569dupG​(p.Ala191SerfsTer45) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,460,992 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CLN3 NM_001042432.2 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 2.01

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]

ENSG00000261832 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 16-28486454-T-TC is Pathogenic according to our data. Variant chr16-28486454-T-TC is described in ClinVar as [Pathogenic]. Clinvar id is 457954.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CLN3	NM_001042432.2	c.569dupG	p.Ala191SerfsTer45	frameshift_variant	Exon 9 of 16	ENST00000636147.2	NP_001035897.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CLN3	ENST00000636147.2	c.569dupG	p.Ala191SerfsTer45	frameshift_variant	Exon 9 of 16	1	NM_001042432.2	ENSP00000490105.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1460992 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 726766

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:1

Sep 26, 2018

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.569dupG variant in the CLN3 gene has not been reported previously as a pathogenic variant nor as a benign variant, to our knowledge. The c.569dupG variant causes a frameshift starting with codon Alanine 191, changes this amino acid to a Serine residue, and creates a premature Stop codon at position 45 of the new reading frame, denoted p.Ala191SerfsX45. This variant is predicted to cause loss of normal protein function either through protein truncation or nonsense-mediated mRNA decay. The c.569dupG variant is not observed in large population cohorts (Lek et al., 2016). We interpret c.569dupG as a pathogenic variant. -

Neuronal ceroid lipofuscinosis Pathogenic:1

Feb 25, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. While this particular variant has not been reported in the literature, loss-of-function variants in CLN3 are known to be pathogenic (PMID: 9311735). This sequence change inserts 1 nucleotide in exon 9 of the CLN3 mRNA (c.569dupG), causing a frameshift at codon 191. This creates a premature translational stop signal (p.Ala191Serfs*45) and is expected to result in an absent or disrupted protein product. -

Neuronal ceroid lipofuscinosis 3 Pathogenic:1

Aug 10, 2021

Genome-Nilou Lab

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

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

LitVar

Other links and lift over

dbSNP: rs386833732; hg19: chr16-28497775;