Genetic Variant IQSEC3:p.Ser269Phe (chr12-125815-C-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_001170738.2(IQSEC3):c.806C>T(p.Ser269Phe) variant causes a missense change. The variant allele was found at a frequency of 0.0000196 in 1,527,600 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000019 ( 0 hom. )

Consequence

IQSEC3
NM_001170738.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.61

Variant links:

Genes affected

IQSEC3 (HGNC:29193): (IQ motif and Sec7 domain ArfGEF 3) Predicted to enable guanyl-nucleotide exchange factor activity. Predicted to be involved in several processes, including actin cytoskeleton organization; activation of GTPase activity; and regulation of small GTPase mediated signal transduction. Located in cytosol and nucleoplasm. [provided by Alliance of Genome Resources, Apr 2022]

IQSEC3 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IQSEC3	NM_001170738.2 link	c.806C>T	p.Ser269Phe	missense_variant	Exon 3 of 14	ENST00000538872.6	NP_001164209.1	Q9UPP2-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IQSEC3	ENST00000538872.6 link	c.806C>T	p.Ser269Phe	missense_variant	Exon 3 of 14	5	NM_001170738.2	ENSP00000437554.1		Q9UPP2-1
IQSEC3	ENST00000382841.2 link	c.-6-12452C>T		intron_variant	Intron 2 of 12	2		ENSP00000372292.2		Q9UPP2-2

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152202

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.0000588

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000322

AC:

AN:

124194

Hom.:

AF XY:

0.0000293

AC XY:

AN XY:

68172

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 SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000855

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000189

AC:

AN:

1375398

Hom.:

Cov.:

AF XY:

0.0000192

AC XY:

AN XY:

678532

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

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:

0.0000242

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152202

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74350

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000588

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000302

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Oct 27, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.806C>T (p.S269F) alteration is located in exon 3 (coding exon 3) of the IQSEC3 gene. This alteration results from a C to T substitution at nucleotide position 806, causing the serine (S) at amino acid position 269 to be replaced by a phenylalanine (F). 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

0.11

BayesDel_addAF

Uncertain

0.018

BayesDel_noAF

Uncertain

-0.080

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.24

Eigen

Uncertain

0.26

Eigen_PC

Uncertain

0.34

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Benign

0.75

M_CAP

Uncertain

0.15

MetaRNN

Uncertain

0.55

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.0

PrimateAI

Uncertain

0.65

PROVEAN

Uncertain

-2.8

REVEL

Benign

0.24

Sift

Pathogenic

0.0

Sift4G

Uncertain

0.016

Vest4

0.57

MutPred

0.20

Loss of phosphorylation at S269 (P = 0.017);

MVP

0.49

MPC

1.2

ClinPred

0.93

GERP RS

5.5

Varity_R

0.12

gMVP

0.48

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