NM_001170738.2:c.557A>T

Variant names:

• chr12-99148-A-T
• rs782386736
• NM_001170738.2:c.557A>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001170738.2(IQSEC3):​c.557A>T​(p.Asn186Ile) variant causes a missense, splice region change. The variant was absent in control chromosomes in GnomAD project. 1/1 splice prediction tools predict no significant impact on normal splicing. 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. N186S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: IQSEC3 NM_001170738.2 missense, splice_region
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.11
• Publications: 0 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 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	c.557A>T	p.Asn186Ile	missense_variant, splice_region_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.557A>T	p.Asn186Ile	missense_variant, splice_region_variant	Exon 2 of 14	5	NM_001170738.2	ENSP00000437554.1
IQSEC3	ENST00000382841.2	c.-73A>T		5_prime_UTR_premature_start_codon_gain_variant	Exon 2 of 13	2		ENSP00000372292.2
IQSEC3	ENST00000382841.2	c.-73A>T		splice_region_variant	Exon 2 of 13	2		ENSP00000372292.2
IQSEC3	ENST00000382841.2	c.-73A>T		5_prime_UTR_variant	Exon 2 of 13	2		ENSP00000372292.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.64
BayesDel_addAF	Benign	-0.064	T
BayesDel_noAF	Benign	-0.33
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Benign	0.027	T
Eigen	Uncertain	0.50
Eigen_PC	Uncertain	0.47
FATHMM_MKL	Benign	0.73	D
LIST_S2	Benign	0.76	T
M_CAP	Benign	0.036	D
MetaRNN	Uncertain	0.59	D
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.0	L
PhyloP100		4.1
PrimateAI	Uncertain	0.75	T
PROVEAN	Benign	-2.1	N
REVEL	Benign	0.16
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.017	D
Vest4		0.80
MutPred		0.22		Gain of catalytic residue at R183 (P = 0.0138);
MVP		0.58
MPC		1.3
ClinPred		0.97	D
GERP RS		4.3
Varity_R		0.51
gMVP		0.43
Mutation Taster		=80/20	polymorphism

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

Other links and lift over

dbSNP: rs782386736; hg19: chr12-208314;