15-90452780-G-A

Position:

• chr15-90452780-G-A

Variant summary

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

The NM_003870.4(IQGAP1):​c.1168G>A​(p.Ala390Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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: not found (cov: 32)
• Consequence: IQGAP1 NM_003870.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.04

Genes affected

IQGAP1 (HGNC:6110): (IQ motif containing GTPase activating protein 1) This gene encodes a member of the IQGAP family. The protein contains four IQ domains, one calponin homology domain, one Ras-GAP domain and one WW domain. It interacts with components of the cytoskeleton, with cell adhesion molecules, and with several signaling molecules to regulate cell morphology and motility. Expression of the protein is upregulated by gene amplification in two gastric cancer cell lines. [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=0.10451552).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
IQGAP1	NM_003870.4	c.1168G>A	p.Ala390Thr	missense_variant	12/38	ENST00000268182.10	NP_003861.1
IQGAP1	XM_047433204.1	c.1168G>A	p.Ala390Thr	missense_variant	12/30		XP_047289160.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
IQGAP1	ENST00000268182.10	c.1168G>A	p.Ala390Thr	missense_variant	12/38	1	NM_003870.4	ENSP00000268182.5
IQGAP1	ENST00000560738.1	c.107-13267G>A		intron_variant		5		ENSP00000453181.1
IQGAP1	ENST00000633485.1	n.1168G>A		non_coding_transcript_exon_variant	12/39	5		ENSP00000488618.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 26, 2022

The c.1168G>A (p.A390T) alteration is located in exon 12 (coding exon 12) of the IQGAP1 gene. This alteration results from a G to A substitution at nucleotide position 1168, causing the alanine (A) at amino acid position 390 to be replaced by a threonine (T). 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	0.080
BayesDel_addAF	Benign	-0.31	T
BayesDel_noAF	Benign	-0.69
CADD	Benign	18
DANN	Benign	0.67
DEOGEN2	Benign	0.25	T
Eigen	Benign	-0.47
Eigen_PC	Benign	-0.39
FATHMM_MKL	Uncertain	0.89	D
LIST_S2	Benign	0.46	T
M_CAP	Benign	0.0031	T
MetaRNN	Benign	0.10	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.1	L
PrimateAI	Benign	0.30	T
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.028
Sift	Benign	0.47	T
Sift4G	Benign	0.48	T
Polyphen		0.0020	B
Vest4		0.17
MutPred		0.41		Gain of loop (P = 0.002);
MVP		0.31
MPC		0.12
ClinPred		0.17	T
GERP RS		3.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.042
gMVP		0.15

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr15-90996012; COSMIC: COSV51585144;