8-1763883-C-T

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BA1

The NM_018941.4(CLN8):c.-126C>T variant causes a splice region, 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0649 in 152,076 control chromosomes in the GnomAD database, including 441 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.065 (440 hom., cov: 28)
  • Exomes 𝑓: 0.068 (1 hom.)
• Consequence: CLN8 NM_018941.4 splice_region, 5_prime_UTR
• Scores: Splicing: ADA: 0.001860
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.120

Genes affected

CLN8 (HGNC:2079): (CLN8 transmembrane ER and ERGIC protein) This gene encodes a transmembrane protein belonging to a family of proteins containing TLC domains, which are postulated to function in lipid synthesis, transport, or sensing. The protein localizes to the endoplasmic reticulum (ER), and may recycle between the ER and ER-Golgi intermediate compartment. Mutations in this gene are associated with a disorder characterized by progressive epilepsy with cognitive disabilities (EPMR), which is a subtype of neuronal ceroid lipofuscinoses (NCL). Patients with mutations in this gene have altered levels of sphingolipid and phospholipids in the brain. [provided by RefSeq, Jul 2017]

CLN8-AS1 (HGNC:55523): (CLN8 antisense RNA 1)

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.69).
• BP6: Variant 8-1763883-C-T is Benign according to our data. Variant chr8-1763883-C-T is described in ClinVar as [Benign]. Clinvar id is 136808.Status of the report is criteria_provided_single_submitter, 1 stars.
• BA1: GnomAd4 highest subpopulation (SAS) allele frequency at 95% confidence interval = 0.181 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CLN8	NM_018941.4	c.-126C>T		splice_region_variant, 5_prime_UTR_variant	1/3	ENST00000331222.6
CLN8-AS1	NR_134303.1	n.151+551G>A		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CLN8	ENST00000331222.6	c.-126C>T		splice_region_variant, 5_prime_UTR_variant	1/3	1	NM_018941.4	P1
CLN8-AS1	ENST00000659375.1	n.75+551G>A		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes AF: 0.0649 AC: 9800 AN: 150900 Hom.: 441 Cov.: 28

Gnomad AFR AF: 0.0145

Gnomad AMI AF: 0.153

Gnomad AMR AF: 0.0331

Gnomad ASJ AF: 0.0457

Gnomad EAS AF: 0.154

Gnomad SAS AF: 0.191

Gnomad FIN AF: 0.128

Gnomad MID AF: 0.0425

Gnomad NFE AF: 0.0776

Gnomad OTH AF: 0.0551

GnomAD4 exome AF: 0.0675 AC: 72 AN: 1066 Hom.: 1 Cov.: 0 AF XY: 0.0625 AC XY: 50 AN XY: 800

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.214

Gnomad4 SAS exome AF: 0.0854

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0645

Gnomad4 OTH exome AF: 0.0652

GnomAD4 genome AF: 0.0649 AC: 9796 AN: 151010 Hom.: 440 Cov.: 28 AF XY: 0.0700 AC XY: 5167 AN XY: 73792

Gnomad4 AFR AF: 0.0144

Gnomad4 AMR AF: 0.0330

Gnomad4 ASJ AF: 0.0457

Gnomad4 EAS AF: 0.154

Gnomad4 SAS AF: 0.191

Gnomad4 FIN AF: 0.128

Gnomad4 NFE AF: 0.0776

Gnomad4 OTH AF: 0.0564

Alfa AF: 0.0642 Hom.: 50

Bravo AF: 0.0536

Asia WGS AF: 0.160 AC: 552 AN: 3448

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

GeneDx

Dec 01, 2013

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.69
Cadd	Benign	7.3
Dann	Benign	0.79
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0019
dbscSNV1_RF	Benign	0.084
SpliceAI score (max)		0.10		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: rs113428006; hg19: chr8-1712049;