chr8-1771065-C-A

Position:

• chr8-1771065-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 4P and 4B. PM1 PM2 BP4_Strong

The NM_018941.4(CLN8):​c.11C>A​(p.Ala4Glu) 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. 15/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A4V) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CLN8 NM_018941.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.67

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 Uncertain_significance. Variant got 0 ACMG points.

• PM1: In a chain Protein CLN8 (size 285) in uniprot entity CLN8_HUMAN there are 49 pathogenic changes around while only 20 benign (71%) in NM_018941.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.046586096).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CLN8	NM_018941.4	c.11C>A	p.Ala4Glu	missense_variant	2/3	ENST00000331222.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CLN8	ENST00000331222.6	c.11C>A	p.Ala4Glu	missense_variant	2/3	1	NM_018941.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

Bravo AF: 0.0000113

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.086
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.49
CADD	Benign	0.0030
DANN	Benign	0.24
DEOGEN2	Benign	0.11	.;T;T;T;T;.;T;.;.
Eigen	Benign	-2.0
Eigen_PC	Benign	-2.0
FATHMM_MKL	Benign	0.013	N
LIST_S2	Benign	0.50	T;.;.;.;.;T;.;T;T
M_CAP	Uncertain	0.14	D
MetaRNN	Benign	0.047	T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.44	T
MutationAssessor	Benign	0.20	.;N;N;N;N;.;N;.;.
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-0.38	.;N;.;.;.;.;.;.;.
REVEL	Benign	0.24
Sift	Benign	1.0	.;T;.;.;.;.;.;.;.
Sift4G	Benign	1.0	T;T;.;.;.;.;.;T;.
Polyphen		0.0	.;B;B;B;B;.;B;.;.
Vest4		0.093
MutPred		0.12		Gain of solvent accessibility (P = 0.0674);Gain of solvent accessibility (P = 0.0674);Gain of solvent accessibility (P = 0.0674);Gain of solvent accessibility (P = 0.0674);Gain of solvent accessibility (P = 0.0674);Gain of solvent accessibility (P = 0.0674);Gain of solvent accessibility (P = 0.0674);Gain of solvent accessibility (P = 0.0674);Gain of solvent accessibility (P = 0.0674);
MVP		0.61
MPC		0.043
ClinPred		0.021	T
GERP RS		-8.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.031
gMVP		0.53

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: rs147181589; hg19: chr8-1719231;