3-197938764-T-C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_032263.5(IQCG):c.299A>G(p.Asn100Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,457,568 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 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)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: IQCG NM_032263.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.457

Genes affected

IQCG (HGNC:25251): (IQ motif containing G) Enables Hsp70 protein binding activity and calmodulin binding activity. Predicted to be involved in sperm axoneme assembly. Located in cytoplasm. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.041736424).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IQCG	NM_032263.5	c.299A>G	p.Asn100Ser	missense_variant	5/12	ENST00000265239.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IQCG	ENST00000265239.11	c.299A>G	p.Asn100Ser	missense_variant	5/12	1	NM_032263.5	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000798 AC: 2 AN: 250648 Hom.: 0 AF XY: 0.00000739 AC XY: 1 AN XY: 135402

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: 0.0000661

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1457568 Hom.: 0 Cov.: 29 AF XY: 0.00000138 AC XY: 1 AN XY: 725386

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: 0.00

Gnomad4 OTH exome AF: 0.0000332

GnomAD4 genome Cov.: 33

Asia WGS AF: 0.000289 AC: 1 AN: 3478

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

Dec 12, 2023

The c.299A>G (p.N100S) alteration is located in exon 5 (coding exon 3) of the IQCG gene. This alteration results from a A to G substitution at nucleotide position 299, causing the asparagine (N) at amino acid position 100 to be replaced by a serine (S). 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	0.082
BayesDel_addAF	Benign	-0.39	T
BayesDel_noAF	Benign	-0.61
Cadd	Benign	5.1
Dann	Benign	0.23
DEOGEN2	Benign	0.00085	T;T;.;.
Eigen	Benign	-1.5
Eigen_PC	Benign	-1.6
FATHMM_MKL	Benign	0.019	N
M_CAP	Benign	0.0044	T
MetaRNN	Benign	0.042	T;T;T;T
MetaSVM	Benign	-1.1	T
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.29	T
PROVEAN	Benign	-0.31	N;N;N;N
REVEL	Benign	0.026
Sift	Benign	0.90	T;T;T;T
Sift4G	Benign	0.94	T;T;T;.
Polyphen		0.0010	B;B;B;.
Vest4		0.067
MutPred		0.16		Gain of disorder (P = 0.0667);Gain of disorder (P = 0.0667);Gain of disorder (P = 0.0667);.;
MVP		0.095
MPC		0.18
ClinPred		0.022	T
GERP RS		-4.2
Varity_R		0.015
gMVP		0.043

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

Other links and lift over

dbSNP: rs369565790; hg19: chr3-197665635;