Genetic Variant CPB2:p.Ala246Glu (chr13-46064707-G-T) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_001872.5(CPB2):c.737C>A(p.Ala246Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000616 in 1,461,726 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A246V) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 0.0000062 ( 0 hom. )

Consequence

CPB2
NM_001872.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.691

Publications

3 publications found

Variant links:

Genes affected

CPB2 (HGNC:2300): (carboxypeptidase B2) Carboxypeptidases are enzymes that hydrolyze C-terminal peptide bonds. The carboxypeptidase family includes metallo-, serine, and cysteine carboxypeptidases. According to their substrate specificity, these enzymes are referred to as carboxypeptidase A (cleaving aliphatic residues) or carboxypeptidase B (cleaving basic amino residues). The protein encoded by this gene is activated by trypsin and acts on carboxypeptidase B substrates. After thrombin activation, the mature protein downregulates fibrinolysis. Polymorphisms have been described for this gene and its promoter region. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Jun 2013]

CPB2 links:

CPB2-AS1 (HGNC:39898): (CPB2 antisense RNA 1)

CPB2-AS1 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.058354944).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001872.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
CPB2	NM_001872.5	MANE Select	c.737C>A	p.Ala246Glu	missense	Exon 8 of 11	NP_001863.3	Q96IY4-1
CPB2	NM_001278541.2		c.626C>A	p.Ala209Glu	missense	Exon 7 of 10	NP_001265470.1	A0A087WSY5
CPB2-AS1	NR_046226.1		n.118+11742G>T		intron	N/A

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
CPB2	ENST00000181383.10	TSL:1 MANE Select	c.737C>A	p.Ala246Glu	missense	Exon 8 of 11	ENSP00000181383.4	Q96IY4-1
CPB2	ENST00000882332.1		c.839C>A	p.Ala280Glu	missense	Exon 8 of 11	ENSP00000552391.1
CPB2	ENST00000882315.1		c.785C>A	p.Ala262Glu	missense	Exon 8 of 11	ENSP00000552374.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000398

AC:

AN:

251450

AF XY:

0.00000736

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:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000616

AC:

AN:

1461726

Hom.:

Cov.:

AF XY:

0.0000110

AC XY:

AN XY:

727174

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44718

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39684

South Asian (SAS)

AF:

0.00

AC:

AN:

86248

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53386

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000809

AC:

AN:

1111922

Other (OTH)

AF:

0.00

AC:

AN:

60386

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.442

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

Cov.:

ExAC

AF:

0.00000824

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.092

BayesDel_addAF

Benign

-0.37

BayesDel_noAF

Benign

-0.77

CADD

Benign

0.0070

(source)

DANN

Benign

0.25

DEOGEN2

Benign

0.073

Eigen

Benign

-1.4

Eigen_PC

Benign

-1.5

FATHMM_MKL

Benign

0.012

LIST_S2

Benign

0.27

M_CAP

Benign

0.0028

MetaRNN

Benign

0.058

MetaSVM

Benign

-0.96

MutationAssessor

Benign

-0.78

PhyloP100

-0.69

PrimateAI

Benign

0.22

PROVEAN

Benign

-0.24

REVEL

Benign

0.018

Sift

Benign

0.43

Sift4G

Benign

0.70

Polyphen

0.0

Vest4

0.064

MutPred

0.59

Gain of solvent accessibility (P = 0.0145)

MVP

0.21

MPC

0.45

ClinPred

0.054

GERP RS

-5.8

Varity_R

0.22

gMVP

0.50

Mutation Taster

=91/9

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.12

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over