4-80201399-G-C

Variant names:

Variant summary

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

The NM_001099403.2(PRDM8):c.329G>C(p.Gly110Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000453 in 1,614,108 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. G110R) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00026 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00047 ( 0 hom. )

Consequence

PRDM8
NM_001099403.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 10.0

Publications

0 publications found

Variant links:

Genes affected

PRDM8 (HGNC:13993): (PR/SET domain 8) This gene encodes a protein that belongs to a conserved family of histone methyltransferases that predominantly act as negative regulators of transcription. The encoded protein contains an N-terminal Su(var)3-9, Enhancer-of-zeste, and Trithorax (SET) domain and a double zinc-finger domain. Knockout of this gene in mouse results in mistargeting by neurons of the dorsal telencephalon, abnormal itch-like behavior, and impaired differentiation of rod bipolar cells. In humans, the protein has been shown to interact with the phosphatase laforin and the ubiquitin ligase malin, which regulate glycogen construction in the cytoplasm. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2016]

PRDM8 Gene-Disease associations (from GenCC):

early-onset Lafora body disease
Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)

PRDM8 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

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

PP3

MetaRNN computational evidence supports a deleterious effect, 0.794

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PRDM8	NM_001099403.2 link	c.329G>C	p.Gly110Ala	missense_variant	Exon 3 of 4	ENST00000415738.3	NP_001092873.1
PRDM8	NM_020226.4 link	c.329G>C	p.Gly110Ala	missense_variant	Exon 9 of 10		NP_064611.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein
PRDM8	ENST00000415738.3 link	c.329G>C	p.Gly110Ala	missense_variant	Exon 3 of 4	1	NM_001099403.2	ENSP00000406998.2
PRDM8	ENST00000339711.8 link	c.329G>C	p.Gly110Ala	missense_variant	Exon 9 of 10	1		ENSP00000339764.4
PRDM8	ENST00000515013.5 link	c.329G>C	p.Gly110Ala	missense_variant	Exon 9 of 10	1		ENSP00000425149.1
PRDM8	ENST00000504452.5 link	c.329G>C	p.Gly110Ala	missense_variant	Exon 7 of 8	5		ENSP00000423985.1

Frequencies

GnomAD3 genomes

AF:

0.000263

AC:

AN:

152216

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000965

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000941

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000514

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000140

AC:

AN:

249586

AF XY:

0.000126

show subpopulations

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:

0.000309

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000473

AC:

691

AN:

1461892

Hom.:

Cov.:

AF XY:

0.000444

AC XY:

323

AN XY:

727246

show subpopulations

African (AFR)

AF:

0.0000597

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.0000383

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.0000936

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000599

AC:

666

AN:

1112010

Other (OTH)

AF:

0.000281

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.469

Heterozygous variant carriers

128

170

213

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

112

140

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000263

AC:

AN:

152216

Hom.:

Cov.:

AF XY:

0.000215

AC XY:

AN XY:

74354

show subpopulations

African (AFR)

AF:

0.0000965

AC:

AN:

41448

American (AMR)

AF:

0.00

AC:

AN:

15286

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5188

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.0000941

AC:

AN:

10628

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.000514

AC:

AN:

68042

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.501

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000447

Hom.:

Bravo

AF:

0.000268

TwinsUK

AF:

0.00135

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.000262

AC:

ESP6500EA

AF:

0.000485

AC:

ExAC

AF:

0.000124

AC:

EpiCase

AF:

0.000545

EpiControl

AF:

0.000415

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Mar 10, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.329G>C (p.G110A) alteration is located in exon 9 (coding exon 2) of the PRDM8 gene. This alteration results from a G to C substitution at nucleotide position 329, causing the glycine (G) at amino acid position 110 to be replaced by an alanine (A). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Early-onset Lafora body disease

Uncertain:1

Jan 15, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with alanine, which is neutral and non-polar, at codon 110 of the PRDM8 protein (p.Gly110Ala). This variant is present in population databases (rs200777615, gnomAD 0.03%). This variant has not been reported in the literature in individuals affected with PRDM8-related conditions. ClinVar contains an entry for this variant (Variation ID: 542336). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt PRDM8 protein function with a negative predictive value of 80%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

not provided

Uncertain:1

Breakthrough Genomics, Breakthrough Genomics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.88

BayesDel_addAF

Uncertain

0.13

BayesDel_noAF

Pathogenic

0.38

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.21

T;.;T;T

Eigen

Pathogenic

0.95

Eigen_PC

Pathogenic

0.95

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.87

.;D;D;.

M_CAP

Benign

0.056

MetaRNN

Pathogenic

0.79

D;D;D;D

MetaSVM

Uncertain

0.58

MutationAssessor

Uncertain

2.8

M;.;M;M

PhyloP100

PrimateAI

Uncertain

0.75

PROVEAN

Uncertain

-3.8

D;D;D;D

REVEL

Pathogenic

0.83

Sift

Uncertain

0.0030

D;D;D;D

Sift4G

Uncertain

0.029

D;D;D;D

Polyphen

1.0

D;.;D;D

Vest4

0.86

MVP

1.0

ClinPred

0.54

GERP RS

6.0

Varity_R

0.61

gMVP

0.66

Mutation Taster

=45/55

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over