8-1771056-T-C

Position:

• chr8-1771056-T-C

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1 PS1_Moderate PM2 PP5_Moderate

The NM_018941.4(CLN8):​c.2T>C​(p.Met1?) variant causes a start lost change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: CLN8 NM_018941.4 start_lost
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 3.79

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]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PS1: Another start lost variant in NM_018941.4 (CLN8) was described as [Pathogenic] in ClinVar as 487522
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 8-1771056-T-C is Pathogenic according to our data. Variant chr8-1771056-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 555468.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CLN8	NM_018941.4	c.2T>C	p.Met1?	start_lost	2/3	ENST00000331222.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CLN8	ENST00000331222.6	c.2T>C	p.Met1?	start_lost	2/3	1	NM_018941.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Neuronal ceroid lipofuscinosis 8 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Counsyl

Dec 08, 2017

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.43
CADD	Benign	19
DANN	Benign	0.86
DEOGEN2	Benign	0.17	.;T;T;T;T;.;T;.;.
Eigen	Uncertain	0.35
Eigen_PC	Uncertain	0.27
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.90	D;.;.;.;.;D;.;D;D
M_CAP	Pathogenic	0.72	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	0.94	D
MutationTaster	Benign	1.0	D
PROVEAN	Benign	-0.79	.;N;.;.;.;.;.;.;.
REVEL	Uncertain	0.64
Sift	Pathogenic	0.0	.;D;.;.;.;.;.;.;.
Sift4G	Pathogenic	0.0	D;D;.;.;.;.;.;D;.
Polyphen		1.0	.;D;D;D;D;.;D;.;.
Vest4		0.96
MutPred		0.99		Gain of glycosylation at M1 (P = 0.0021);Gain of glycosylation at M1 (P = 0.0021);Gain of glycosylation at M1 (P = 0.0021);Gain of glycosylation at M1 (P = 0.0021);Gain of glycosylation at M1 (P = 0.0021);Gain of glycosylation at M1 (P = 0.0021);Gain of glycosylation at M1 (P = 0.0021);Gain of glycosylation at M1 (P = 0.0021);Gain of glycosylation at M1 (P = 0.0021);
MVP		0.97
ClinPred		0.92	D
GERP RS		5.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.83
gMVP		0.69

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: rs1554448874; hg19: chr8-1719222;