8-68017885-G-A

Position:

chr8-68017885-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_024870.4(PREX2):c.181G>A(p.Val61Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000105 in 1,612,818 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000033 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000082 ( 0 hom. )

Consequence

PREX2
NM_024870.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.73

Variant links:

Genes affected

PREX2 (HGNC:22950): (phosphatidylinositol-3,4,5-trisphosphate dependent Rac exchange factor 2) The protein encoded by this gene belongs to the phosphatidylinositol 3,4,5-trisphosphate (PIP3)-dependent Rac exchanger (PREX) family, which are Dbl-type guanine-nucleotide exchange factors for Rac family small G proteins. Structural domains of this protein include the catalytic diffuse B-cell lymphoma homology and pleckstrin homology (DHPH) domain, two disheveled, EGL-10, and pleckstrin homology (DEP) domains, two PDZ domains, and a C-terminal inositol polyphosphate-4 phosphatase (IP4P) domain that is found in one of the isoforms. This protein facilitates the exchange of GDP for GTP on Rac1, allowing the GTP-bound Rac1 to activate downstream effectors. Studies also show that the pleckstrin homology domain of this protein interacts with the phosphatase and tensin homolog (PTEN) gene product to inhibit PTEN phosphatase activity, thus activating the phosphoinositide-3 kinase (PI3K) signaling pathway. Conversely, the PTEN gene product has also been shown to inhibit the GEF activity of this protein. This gene plays a role in insulin-signaling pathways, and either mutations or overexpression of this gene have been observed in some cancers. [provided by RefSeq, Apr 2016]

PREX2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.048853844).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PREX2	NM_024870.4 link	c.181G>A	p.Val61Ile	missense_variant	2/40	ENST00000288368.5	NP_079146.2	Q70Z35-1
PREX2	NM_025170.6 link	c.181G>A	p.Val61Ile	missense_variant	2/24		NP_079446.3	Q70Z35-3
PREX2	XM_047422267.1 link	c.46G>A	p.Val16Ile	missense_variant	2/40		XP_047278223.1
PREX2	XM_047422268.1 link	c.181G>A	p.Val61Ile	missense_variant	2/28		XP_047278224.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	UniProt
PREX2	ENST00000288368.5 link	c.181G>A	p.Val61Ile	missense_variant	2/40	1	NM_024870.4	ENSP00000288368.4	Q70Z35-1
PREX2	ENST00000529398.5 link	n.208G>A		non_coding_transcript_exon_variant	2/24	1
PREX2	ENST00000517617.1 link	n.48-4151G>A		intron_variant		2

Frequencies

GnomAD3 genomes

AF:

0.0000329

AC:

AN:

152156

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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

GnomAD3 exomes

AF:

0.0000321

AC:

AN:

249294

Hom.:

AF XY:

0.0000297

AC XY:

AN XY:

134748

show subpopulations

Gnomad AFR exome

AF:

0.000124

Gnomad AMR exome

AF:

0.000174

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000822

AC:

AN:

1460662

Hom.:

Cov.:

AF XY:

0.00000826

AC XY:

AN XY:

726610

show subpopulations

Gnomad4 AFR exome

AF:

0.0000898

Gnomad4 AMR exome

AF:

0.000201

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000329

AC:

AN:

152156

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74322

show subpopulations

Gnomad4 AFR

AF:

0.0000724

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000453

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 08, 2024

The c.181G>A (p.V61I) alteration is located in exon 2 (coding exon 2) of the PREX2 gene. This alteration results from a G to A substitution at nucleotide position 181, causing the valine (V) at amino acid position 61 to be replaced by an isoleucine (I). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.062

BayesDel_addAF

Benign

-0.39

BayesDel_noAF

Benign

-0.53

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Benign

0.041

Eigen

Benign

-0.45

Eigen_PC

Benign

-0.24

FATHMM_MKL

Benign

0.76

LIST_S2

Benign

0.78

M_CAP

Benign

0.0084

MetaRNN

Benign

0.049

MetaSVM

Benign

-0.99

MutationAssessor

Benign

0.96

PrimateAI

Benign

0.47

PROVEAN

Benign

-0.18

REVEL

Benign

0.037

Sift

Benign

0.34

Sift4G

Benign

0.60

Polyphen

0.0

Vest4

0.029

MVP

0.46

MPC

0.37

ClinPred

0.019

GERP RS

3.1

Varity_R

0.015

gMVP

0.054

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