12-99156-G-A

Variant names:

• chr12-99156-G-A
• rs782374992
• NM_001170738.2:c.565G>A

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001170738.2(IQSEC3):​c.565G>A​(p.Val189Met) variant causes a missense change. The variant allele was found at a frequency of 0.00004 in 1,598,686 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V189A) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000026 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000041 (0 hom.)
• Consequence: IQSEC3 NM_001170738.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.62
• Publications: 1 publications found

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]

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.37260747).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IQSEC3	NM_001170738.2	c.565G>A	p.Val189Met	missense_variant	Exon 2 of 14	ENST00000538872.6	NP_001164209.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IQSEC3	ENST00000538872.6	c.565G>A	p.Val189Met	missense_variant	Exon 2 of 14	5	NM_001170738.2	ENSP00000437554.1
IQSEC3	ENST00000382841.2	c.-65G>A		5_prime_UTR_premature_start_codon_gain_variant	Exon 2 of 13	2		ENSP00000372292.2
IQSEC3	ENST00000382841.2	c.-65G>A		5_prime_UTR_variant	Exon 2 of 13	2		ENSP00000372292.2

Frequencies

GnomAD3 genomes AF: 0.0000263 AC: 4 AN: 152202 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000192

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.000478

GnomAD2 exomes AF: 0.0000213 AC: 5 AN: 234636 AF XY: 0.0000155

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000567

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000182

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000415 AC: 60 AN: 1446484 Hom.: 0 Cov.: 31 AF XY: 0.0000375 AC XY: 27 AN XY: 719920

African (AFR) AF: 0.00 AC: 0 AN: 33474

American (AMR) AF: 0.0000224 AC: 1 AN: 44678

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26120

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39682

South Asian (SAS) AF: 0.0000581 AC: 5 AN: 86128

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 38694

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 0.0000477 AC: 53 AN: 1111674

Other (OTH) AF: 0.00 AC: 0 AN: 60268

GnomAD4 genome AF: 0.0000263 AC: 4 AN: 152202 Hom.: 0 Cov.: 33 AF XY: 0.0000269 AC XY: 2 AN XY: 74358

African (AFR) AF: 0.00 AC: 0 AN: 41442

American (AMR) AF: 0.0000654 AC: 1 AN: 15286

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.000192 AC: 1 AN: 5200

South Asian (SAS) AF: 0.00 AC: 0 AN: 4832

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10614

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000147 AC: 1 AN: 68040

Other (OTH) AF: 0.000478 AC: 1 AN: 2090

Alfa AF: 0.0000712 Hom.: 0

Bravo AF: 0.0000340

TwinsUK AF: 0.00 AC: 0

ALSPAC AF: 0.000259 AC: 1

ExAC AF: 0.0000418 AC: 5

EpiCase AF: 0.0000545

EpiControl AF: 0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Aug 30, 2021

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.565G>A (p.V189M) alteration is located in exon 2 (coding exon 2) of the IQSEC3 gene. This alteration results from a G to A substitution at nucleotide position 565, causing the valine (V) at amino acid position 189 to be replaced by a methionine (M). 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	Pathogenic	0.59
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.37
CADD	Pathogenic	30
DANN	Uncertain	1.0
DEOGEN2	Benign	0.016	T
Eigen	Uncertain	0.33
Eigen_PC	Uncertain	0.37
FATHMM_MKL	Benign	0.74	D
LIST_S2	Benign	0.85	T
M_CAP	Benign	0.029	D
MetaRNN	Benign	0.37	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.0	L
PhyloP100		5.6
PrimateAI	Uncertain	0.73	T
PROVEAN	Benign	-0.80	N
REVEL	Benign	0.10
Sift	Uncertain	0.0010	D
Sift4G	Benign	0.099	T
Vest4		0.57
MVP		0.51
MPC		1.2
ClinPred		0.75	D
GERP RS		4.3
Varity_R		0.33
gMVP		0.32
Mutation Taster		=89/11	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs782374992; hg19: chr12-208322; COSMIC: COSV58283925;