Genetic Variant PPP2R2B:n.162_167delAGCAGC (chr5-146878727-AGCTGCT-A) – ACMG Classification: Benign (-8 pts)

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BS1BS2

The ENST00000530902.5(PPP2R2B):n.162_167delAGCAGC variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000966 in 1,297,202 control chromosomes in the GnomAD database, including 10 homozygotes. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.0051 ( 8 hom., cov: 0)

Exomes 𝑓: 0.00043 ( 2 hom. )

Consequence

PPP2R2B
ENST00000530902.5 non_coding_transcript_exon

Scores

Not classified

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 3.19

Publications

4 publications found

Variant links:

Genes affected

PPP2R2B (HGNC:9305): (protein phosphatase 2 regulatory subunit Bbeta) The product of this gene belongs to the phosphatase 2 regulatory subunit B family. Protein phosphatase 2 is one of the four major Ser/Thr phosphatases, and it is implicated in the negative control of cell growth and division. It consists of a common heteromeric core enzyme, which is composed of a catalytic subunit and a constant regulatory subunit, that associates with a variety of regulatory subunits. The B regulatory subunit might modulate substrate selectivity and catalytic activity. This gene encodes a beta isoform of the regulatory subunit B55 subfamily. Defects in this gene cause autosomal dominant spinocerebellar ataxia 12 (SCA12), a disease caused by degeneration of the cerebellum, sometimes involving the brainstem and spinal cord, and in resulting in poor coordination of speech and body movements. Multiple alternatively spliced variants, which encode different isoforms, have been identified for this gene. The 5' UTR of some of these variants includes a CAG trinucleotide repeat sequence (7-28 copies) that can be expanded to 55-78 copies in cases of SCA12. [provided by RefSeq, Jul 2016]

PPP2R2B Gene-Disease associations (from GenCC):

spinocerebellar ataxia type 12
Inheritance: AD Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae)

PPP2R2B links:

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ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -8 ACMG points.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00507 (763/150598) while in subpopulation AFR AF = 0.0171 (701/40998). AF 95% confidence interval is 0.016. There are 8 homozygotes in GnomAd4. There are 358 alleles in the male GnomAd4 subpopulation. Median coverage is 0. This position passed quality control check.

BS2

High AC in GnomAd4 at 763 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PPP2R2B	NM_181675.4 link	c.-267_-262delAGCAGC		5_prime_UTR_variant	Exon 1 of 10	ENST00000394411.9	NP_858061.3	Q00005-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PPP2R2B	ENST00000394411.9 link	c.-267_-262delAGCAGC		5_prime_UTR_variant	Exon 1 of 10	2	NM_181675.4	ENSP00000377933.3		Q00005-1

Frequencies

GnomAD3 genomes

AF:

0.00506

AC:

762

AN:

150480

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0171

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00211

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000203

Gnomad SAS

AF:

0.000425

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000237

Gnomad OTH

AF:

0.00532

GnomAD4 exome

AF:

0.000427

AC:

490

AN:

1146604

Hom.:

AF XY:

0.000399

AC XY:

224

AN XY:

561906

show subpopulations

African (AFR)

AF:

0.0112

AC:

260

AN:

23316

American (AMR)

AF:

0.000221

AC:

AN:

27132

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

15240

East Asian (EAS)

AF:

0.0000420

AC:

AN:

23798

South Asian (SAS)

AF:

0.000110

AC:

AN:

72520

European-Finnish (FIN)

AF:

0.00

AC:

AN:

15558

Middle Eastern (MID)

AF:

0.00

AC:

AN:

2848

European-Non Finnish (NFE)

AF:

0.000200

AC:

185

AN:

923290

Other (OTH)

AF:

0.000699

AC:

AN:

42902

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.485

Heterozygous variant carriers

108

135

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

110

<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:

0.00507

AC:

763

AN:

150598

Hom.:

Cov.:

AF XY:

0.00487

AC XY:

358

AN XY:

73470

show subpopulations

African (AFR)

AF:

0.0171

AC:

701

AN:

40998

American (AMR)

AF:

0.00211

AC:

AN:

15176

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3460

East Asian (EAS)

AF:

0.000204

AC:

AN:

4910

South Asian (SAS)

AF:

0.000426

AC:

AN:

4698

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10442

Middle Eastern (MID)

AF:

0.00

AC:

AN:

290

European-Non Finnish (NFE)

AF:

0.000237

AC:

AN:

67634

Other (OTH)

AF:

0.00527

AC:

AN:

2088

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.495

Heterozygous variant carriers

113

150

188

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

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:

0.00

Hom.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

3.2

Mutation Taster

=299/1

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

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over