rs764231649

Variant names:

• chr6-145686253-G-A
• rs764231649
• NM_005670.4:c.345C>T
• EPM2A p.Asn115Asn

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 2P and 11B. PM2 BP4_Moderate BP6_Very_Strong BP7

The NM_005670.4(EPM2A):​c.345C>T​(p.Asn115Asn) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000342 in 1,461,696 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: EPM2A NM_005670.4 synonymous
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: 1.35
• Publications: 0 publications found

Genes affected

EPM2A (HGNC:3413): (EPM2A glucan phosphatase, laforin) This gene encodes a dual-specificity phosphatase and may be involved in the regulation of glycogen metabolism. The protein acts on complex carbohydrates to prevent glycogen hyperphosphorylation, thus avoiding the formation of insoluble aggregates. Loss-of-function mutations in this gene have been associated with Lafora disease, a rare, adult-onset recessive neurodegenerative disease, which results in myoclonus epilepsy and usually results in death several years after the onset of symptoms. The disease is characterized by the accumulation of insoluble particles called Lafora bodies, which are derived from glycogen. [provided by RefSeq, Jan 2018]

EPM2A Gene-Disease associations (from GenCC):

• Lafora disease

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), Orphanet, Genomics England PanelApp

ENSG00000307801 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -9 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (REVEL=0.055).
• BP6: Variant 6-145686253-G-A is Benign according to our data. Variant chr6-145686253-G-A is described in ClinVar as Likely_benign. ClinVar VariationId is 416698.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=1.36 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005670.4. 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
	EPM2A	NM_005670.4	MANE Select	c.345C>T	p.Asn115Asn	synonymous	Exon 2 of 4	NP_005661.1	O95278-1
	EPM2A	NM_001018041.2		c.345C>T	p.Asn115Asn	synonymous	Exon 2 of 5	NP_001018051.1	O95278-2
	EPM2A	NM_001368130.1		c.345C>T	p.Asn115Asn	synonymous	Exon 2 of 3	NP_001355059.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	EPM2A	ENST00000367519.9	TSL:1 MANE Select	c.345C>T	p.Asn115Asn	synonymous	Exon 2 of 4	ENSP00000356489.3	O95278-1
	EPM2A	ENST00000435470.2	TSL:1	c.345C>T	p.Asn115Asn	synonymous	Exon 2 of 5	ENSP00000405913.2	O95278-2
	EPM2A	ENST00000638262.1	TSL:1	c.345C>T	p.Asn115Asn	synonymous	Exon 2 of 3	ENSP00000492876.1	O95278-5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.0000159 AC: 4 AN: 251420 AF XY: 0.0000147

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000116

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1461696 Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 727162

African (AFR) AF: 0.00 AC: 0 AN: 33474

American (AMR) AF: 0.000112 AC: 5 AN: 44714

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26126

East Asian (EAS) AF: 0.00 AC: 0 AN: 39688

South Asian (SAS) AF: 0.00 AC: 0 AN: 86248

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53416

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111874

Other (OTH) AF: 0.00 AC: 0 AN: 60388

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000113

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	1	Inborn genetic diseases (1)
-	-	1	Progressive myoclonic epilepsy (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.47
CADD	Benign	13
DANN	Benign	0.58
PhyloP100		1.4
PromoterAI		-0.069	Neutral

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.11		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: rs764231649;

hg19: chr6-146007389;