4-80202310-TCAGCAGCGGTAG-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BP3

The NM_001099403.2(PRDM8):c.850_861delAGCAGCGGTAGC(p.Ser284_Ser287del) variant causes a conservative inframe deletion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000125 in 1,601,772 control chromosomes in the GnomAD database, with no homozygous occurrence. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000069 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000013 ( 0 hom. )

Consequence

PRDM8
NM_001099403.2 conservative_inframe_deletion

Scores

Not classified

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.57

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: Likely_benign. The variant received -1 ACMG points.

BP3

Nonframeshift variant in repetitive region in NM_001099403.2

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PRDM8	NM_001099403.2 link	c.850_861delAGCAGCGGTAGC	p.Ser284_Ser287del	conservative_inframe_deletion	Exon 4 of 4	ENST00000415738.3	NP_001092873.1
PRDM8	NM_020226.4 link	c.850_861delAGCAGCGGTAGC	p.Ser284_Ser287del	conservative_inframe_deletion	Exon 10 of 10		NP_064611.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein
PRDM8	ENST00000415738.3 link	c.850_861delAGCAGCGGTAGC	p.Ser284_Ser287del	conservative_inframe_deletion	Exon 4 of 4	1	NM_001099403.2	ENSP00000406998.2
PRDM8	ENST00000339711.8 link	c.850_861delAGCAGCGGTAGC	p.Ser284_Ser287del	conservative_inframe_deletion	Exon 10 of 10	1		ENSP00000339764.4
PRDM8	ENST00000515013.5 link	c.850_861delAGCAGCGGTAGC	p.Ser284_Ser287del	conservative_inframe_deletion	Exon 10 of 10	1		ENSP00000425149.1
PRDM8	ENST00000504452.5 link	c.850_861delAGCAGCGGTAGC	p.Ser284_Ser287del	conservative_inframe_deletion	Exon 8 of 8	5		ENSP00000423985.1

Frequencies

GnomAD3 genomes

AF:

0.00000692

AC:

AN:

144486

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000260

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:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.0000130

AC:

AN:

1457286

Hom.:

AF XY:

0.00000965

AC XY:

AN XY:

725030

show subpopulations

African (AFR)

AF:

0.000420

AC:

AN:

33354

American (AMR)

AF:

0.00

AC:

AN:

44548

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26038

East Asian (EAS)

AF:

0.00

AC:

AN:

39566

South Asian (SAS)

AF:

0.00

AC:

AN:

86096

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51842

Middle Eastern (MID)

AF:

0.000348

AC:

AN:

5750

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1109930

Other (OTH)

AF:

0.0000499

AC:

AN:

60162

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.451

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

AF:

0.00000692

AC:

AN:

144486

Hom.:

Cov.:

AF XY:

0.0000142

AC XY:

AN XY:

70416

show subpopulations

African (AFR)

AF:

0.0000260

AC:

AN:

38514

American (AMR)

AF:

0.00

AC:

AN:

14670

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3414

East Asian (EAS)

AF:

0.00

AC:

AN:

4698

South Asian (SAS)

AF:

0.00

AC:

AN:

4516

European-Finnish (FIN)

AF:

0.00

AC:

AN:

9694

Middle Eastern (MID)

AF:

0.00

AC:

AN:

262

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

65870

Other (OTH)

AF:

0.00

AC:

AN:

1992

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000508

Hom.:

Bravo

AF:

0.00000378

Asia WGS

AF:

0.000577

AC:

AN:

3478

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

Oct 14, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant, c.850_861del, results in the deletion of 4 amino acid(s) of the PRDM8 protein (p.Ser284_Ser287del), but otherwise preserves the integrity of the reading frame. This variant is present in population databases (no rsID available, gnomAD 0.01%). 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: 475685). Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

1.6

Mutation Taster

=179/21

polymorphism

(source)

Splicing

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

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over