chr16-28477417-G-A

Position:

• chr16-28477417-G-A

Variant summary

Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_Strong BP6 BS1 BS2

The NM_001042432.2(CLN3):​c.*99C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00183 in 1,536,116 control chromosomes in the GnomAD database, including 28 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0081 (15 hom., cov: 32)
  • Exomes 𝑓: 0.0011 (13 hom.)
• Consequence: CLN3 NM_001042432.2 3_prime_UTR
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:2
• Conservation: PhyloP100: -1.08

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 Benign. Variant got -13 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.86).
• BP6: Variant 16-28477417-G-A is Benign according to our data. Variant chr16-28477417-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 318712.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1, Benign=1}.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0081 (1233/152288) while in subpopulation AFR AF= 0.0258 (1072/41572). AF 95% confidence interval is 0.0245. There are 15 homozygotes in gnomad4. There are 600 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 15 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CLN3	NM_001042432.2	c.*99C>T		3_prime_UTR_variant	16/16	ENST00000636147.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CLN3	ENST00000636147.2	c.*99C>T		3_prime_UTR_variant	16/16	1	NM_001042432.2	P1

Frequencies

GnomAD3 genomes AF: 0.00802 AC: 1220 AN: 152170 Hom.: 15 Cov.: 32

Gnomad AFR AF: 0.0255

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00661

Gnomad ASJ AF: 0.00778

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.000338

Gnomad OTH AF: 0.00430

GnomAD4 exome AF: 0.00114 AC: 1582 AN: 1383828 Hom.: 13 Cov.: 22 AF XY: 0.00102 AC XY: 708 AN XY: 691716

Gnomad4 AFR exome AF: 0.0211

Gnomad4 AMR exome AF: 0.00375

Gnomad4 ASJ exome AF: 0.00519

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000238

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000397

Gnomad4 OTH exome AF: 0.00301

GnomAD4 genome AF: 0.00810 AC: 1233 AN: 152288 Hom.: 15 Cov.: 32 AF XY: 0.00806 AC XY: 600 AN XY: 74456

Gnomad4 AFR AF: 0.0258

Gnomad4 AMR AF: 0.00660

Gnomad4 ASJ AF: 0.00778

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000338

Gnomad4 OTH AF: 0.00425

Alfa AF: 0.00490 Hom.: 0

Bravo AF: 0.00863

Asia WGS AF: 0.00289 AC: 10 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:2

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Neuronal Ceroid-Lipofuscinosis, Dominant/Recessive Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Jul 08, 2018

- -

Neuronal ceroid lipofuscinosis 3 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.86
CADD	Benign	0.17
DANN	Benign	0.38

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs113845299; hg19: chr16-28488738;