20-48632299-G-T

Variant names:

• chr20-48632299-G-T
• NM_020820.4:c.4504C>A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_020820.4(PREX1):​c.4504C>A​(p.Gln1502Lys) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: PREX1 NM_020820.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.89

Genes affected

PREX1 (HGNC:32594): (phosphatidylinositol-3,4,5-trisphosphate dependent Rac exchange factor 1) The protein encoded by this gene acts as a guanine nucleotide exchange factor for the RHO family of small GTP-binding proteins (RACs). It has been shown to bind to and activate RAC1 by exchanging bound GDP for free GTP. The encoded protein, which is found mainly in the cytoplasm, is activated by phosphatidylinositol-3,4,5-trisphosphate and the beta-gamma subunits of heterotrimeric G proteins. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.13367274).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PREX1	NM_020820.4	c.4504C>A	p.Gln1502Lys	missense_variant	Exon 35 of 40	ENST00000371941.4	NP_065871.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PREX1	ENST00000371941.4	c.4504C>A	p.Gln1502Lys	missense_variant	Exon 35 of 40	1	NM_020820.4	ENSP00000361009.3
PREX1	ENST00000482556.5	n.2571C>A		non_coding_transcript_exon_variant	Exon 17 of 22	2		ENSP00000434632.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Jan 15, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.4504C>A (p.Q1502K) alteration is located in exon 35 (coding exon 35) of the PREX1 gene. This alteration results from a C to A substitution at nucleotide position 4504, causing the glutamine (Q) at amino acid position 1502 to be replaced by a lysine (K). 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	0.17
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.56
CADD	Benign	21
DANN	Benign	0.90
DEOGEN2	Benign	0.041	T
Eigen	Benign	-0.48
Eigen_PC	Benign	-0.31
FATHMM_MKL	Uncertain	0.83	D
LIST_S2	Benign	0.69	T
M_CAP	Benign	0.0084	T
MetaRNN	Benign	0.13	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	-0.025	N
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	-0.37	N
REVEL	Benign	0.10
Sift	Benign	0.90	T
Sift4G	Benign	1.0	T
Polyphen		0.0010	B
Vest4		0.29
MutPred		0.33		Gain of methylation at Q1502 (P = 0.0163);
MVP		0.44
MPC		0.44
ClinPred		0.35	T
GERP RS		4.5
Varity_R		0.24
gMVP		0.47

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.17		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr20-47248837;