16-28477739-C-T

Variant names:

• chr16-28477739-C-T
• rs386833701
• NM_001042432.2:c.1195G>A
• CLN3 p.Glu399Lys

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001042432.2(CLN3):​c.1195G>A​(p.Glu399Lys) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predict no significant impact on normal splicing. 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. E399D) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: CLN3 NM_001042432.2 missense, splice_region
• Scores: Splicing: ADA: 0.9307
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.15
• Publications: 3 publications found

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]

CLN3 Gene-Disease associations (from GenCC):

• inherited retinal dystrophy

  Inheritance: AR Classification: DEFINITIVE Submitted by: G2P
• neuronal ceroid lipofuscinosis

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• neuronal ceroid lipofuscinosis 3

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Myriad Women's Health, G2P, Orphanet

ENSG00000261832 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.835

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001042432.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CLN3	NM_001042432.2	MANE Select	c.1195G>A	p.Glu399Lys	missense splice_region	Exon 15 of 16	NP_001035897.1	Q13286-1
	CLN3	NM_000086.2		c.1195G>A	p.Glu399Lys	missense splice_region	Exon 14 of 15	NP_000077.1	Q13286-1
	CLN3	NM_001286104.2		c.1123G>A	p.Glu375Lys	missense splice_region	Exon 14 of 15	NP_001273033.1	Q13286-7

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CLN3	ENST00000636147.2	TSL:1 MANE Select	c.1195G>A	p.Glu399Lys	missense splice_region	Exon 15 of 16	ENSP00000490105.1	Q13286-1
	CLN3	ENST00000359984.12	TSL:1	c.1195G>A	p.Glu399Lys	missense splice_region	Exon 14 of 15	ENSP00000353073.9	Q13286-1
	CLN3	ENST00000565316.6	TSL:1	c.1144G>A	p.Glu382Lys	missense splice_region	Exon 13 of 14	ENSP00000456117.1	Q13286-3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.32
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Pathogenic	0.30
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.78	D
Eigen	Uncertain	0.53
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.86	D
M_CAP	Uncertain	0.27	D
MetaRNN	Pathogenic	0.83	D
MetaSVM	Pathogenic	0.89	D
MutationAssessor	Uncertain	2.3	M
PhyloP100		3.2
PrimateAI	Uncertain	0.66	T
PROVEAN	Uncertain	-2.7	D
REVEL	Pathogenic	0.80
Sift	Uncertain	0.0030	D
Sift4G	Benign	0.13	T
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.69
gMVP		0.66

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.93
dbscSNV1_RF	Pathogenic	0.76
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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs386833701;

hg19: chr16-28489060;

COSMIC: COSV104658623;

COSMIC: COSV104658623;