4-80200138-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001099403.2(PRDM8):c.58C>A(p.Gln20Lys) variant causes a missense change. The variant allele was found at a frequency of 0.00000205 in 1,461,852 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

PRDM8
NM_001099403.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.89

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PRDM8	NM_001099403.2 linkuse as main transcript	c.58C>A	p.Gln20Lys	missense_variant	2/4	ENST00000415738.3
PRDM8	NM_020226.4 linkuse as main transcript	c.58C>A	p.Gln20Lys	missense_variant	8/10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PRDM8	ENST00000415738.3 linkuse as main transcript	c.58C>A	p.Gln20Lys	missense_variant	2/4	1	NM_001099403.2	P1	Q9NQV8-1
PRDM8	ENST00000339711.8 linkuse as main transcript	c.58C>A	p.Gln20Lys	missense_variant	8/10	1		P1	Q9NQV8-1
PRDM8	ENST00000515013.5 linkuse as main transcript	c.58C>A	p.Gln20Lys	missense_variant	8/10	1
PRDM8	ENST00000504452.5 linkuse as main transcript	c.58C>A	p.Gln20Lys	missense_variant	6/8	5		P1	Q9NQV8-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000401

AC:

AN:

249572

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135406

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 SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000205

AC:

AN:

1461852

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727234

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000232

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000827

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Early-onset Lafora body disease

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jan 28, 2021

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. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with PRDM8-related conditions. This variant is present in population databases (rs766294833, ExAC 0.006%). This sequence change replaces glutamine with lysine at codon 20 of the PRDM8 protein (p.Gln20Lys). The glutamine residue is highly conserved and there is a small physicochemical difference between glutamine and lysine. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.51

BayesDel_addAF

Benign

-0.053

BayesDel_noAF

Benign

-0.22

Cadd

Pathogenic

Dann

Uncertain

0.99

DEOGEN2

Benign

0.049

T;.;T;T

Eigen

Uncertain

0.51

Eigen_PC

Uncertain

0.56

FATHMM_MKL

Pathogenic

0.99

M_CAP

Benign

0.029

MetaRNN

Uncertain

0.55

D;D;D;D

MetaSVM

Benign

-0.48

MutationAssessor

Benign

0.0

N;.;N;N

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.78

PROVEAN

Benign

-2.1

N;N;N;N

REVEL

Benign

0.28

Sift

Uncertain

0.026

D;D;D;D

Sift4G

Benign

0.24

T;D;T;T

Polyphen

1.0

D;.;D;D

Vest4

0.64

MutPred

0.48

Gain of methylation at Q20 (P = 0.0051);Gain of methylation at Q20 (P = 0.0051);Gain of methylation at Q20 (P = 0.0051);Gain of methylation at Q20 (P = 0.0051);

MVP

0.97

ClinPred

0.88

GERP RS

5.3

Varity_R

0.42

gMVP

0.81

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over