NM_005670.4:c.962T>G

Variant names:

• chr6-145627450-A-C
• rs772620616
• NM_005670.4:c.962T>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 1P and 0B. PP3

The NM_005670.4(EPM2A):​c.962T>G​(p.Phe321Cys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000157 in 1,461,894 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. F321S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000016 (1 hom.)
• Consequence: EPM2A NM_005670.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 8.95
• Publications: 9 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, Orphanet, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PP3: MetaRNN computational evidence supports a deleterious effect, 0.835

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.962T>G	p.Phe321Cys	missense	Exon 4 of 4	NP_005661.1	O95278-1
	EPM2A	NM_001360064.2		c.548T>G	p.Phe183Cys	missense	Exon 4 of 4	NP_001346993.1	O95278-8
	EPM2A	NM_001360071.2		c.548T>G	p.Phe183Cys	missense	Exon 5 of 5	NP_001347000.1	O95278-8

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	EPM2A	ENST00000367519.9	TSL:1 MANE Select	c.962T>G	p.Phe321Cys	missense	Exon 4 of 4	ENSP00000356489.3	O95278-1
	EPM2A	ENST00000639423.1	TSL:1	c.548T>G	p.Phe183Cys	missense	Exon 4 of 4	ENSP00000492701.1	O95278-8
	EPM2A	ENST00000638262.1	TSL:1	c.*45T>G		3_prime_UTR	Exon 3 of 3	ENSP00000492876.1	O95278-5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.0000358 AC: 9 AN: 251490 AF XY: 0.0000441

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

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: 0.0000157 AC: 23 AN: 1461894 Hom.: 1 Cov.: 32 AF XY: 0.0000234 AC XY: 17 AN XY: 727248

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.000267 AC: 23 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

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

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1112012

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000824 AC: 1

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	1	-	Lafora disease (1)
-	1	-	Progressive myoclonic epilepsy (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.74
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Pathogenic	0.34
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Benign	0.32	T
Eigen	Uncertain	0.59
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	D
M_CAP	Pathogenic	0.49	D
MetaRNN	Pathogenic	0.84	D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Uncertain	2.2	M
PhyloP100		8.9
PrimateAI	Uncertain	0.60	T
PROVEAN	Uncertain	-3.0	D
REVEL	Pathogenic	0.81
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.76
MutPred		0.55		Gain of sheet (P = 0.0827)
MVP		1.0
MPC		1.1
ClinPred		0.79	D
GERP RS		4.7
gMVP		0.86
Mutation Taster		=7/93	disease causing

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

Other links and lift over

dbSNP: rs772620616; hg19: chr6-145948586;