X-53234582-C-G

Variant names:

• chrX-53234582-C-G
• rs184087864
• NM_001111125.3:c.4104G>C

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_001111125.3(IQSEC2):​c.4104G>C​(p.Leu1368Leu) variant causes a synonymous 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. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. L1368L) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.0 (0 hom., 0 hem., cov: 20)
  • Failed GnomAD Quality Control
• Consequence: IQSEC2 NM_001111125.3 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0530
• Publications: 4 publications found

Genes affected

IQSEC2 (HGNC:29059): (IQ motif and Sec7 domain ArfGEF 2) This gene encodes a guanine nucleotide exchange factor for the ARF family of small GTP-binding proteins. The encoded protein is a component of the postsynaptic density at excitatory synapses, and may play a critical role in cytoskeletal and synaptic organization through the activation of selected ARF substrates including ARF1 and ARF6. Mutations in this gene have been implicated in nonsyndromic X-linked cognitive disability. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Aug 2011]

IQSEC2 Gene-Disease associations (from GenCC):

• complex neurodevelopmental disorder

  Inheritance: XL Classification: DEFINITIVE Submitted by: Ambry Genetics
• intellectual disability, X-linked 1

  Inheritance: XL Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, G2P
• X-linked complex neurodevelopmental disorder

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
• non-syndromic X-linked intellectual disability

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet
• severe intellectual disability-progressive postnatal microcephaly- midline stereotypic hand movements syndrome

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.66).
• BP7: Synonymous conserved (PhyloP=-0.053 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001111125.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IQSEC2	NM_001111125.3	MANE Select	c.4104G>C	p.Leu1368Leu	synonymous	Exon 15 of 15	NP_001104595.1	Q5JU85-2
	IQSEC2	NM_001410736.1		c.*589G>C		3_prime_UTR	Exon 14 of 14	NP_001397665.1	A0A1W2PR28
	IQSEC2	NM_001441093.1		c.*589G>C		3_prime_UTR	Exon 14 of 14	NP_001428022.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IQSEC2	ENST00000642864.1	MANE Select	c.4104G>C	p.Leu1368Leu	synonymous	Exon 15 of 15	ENSP00000495726.1	Q5JU85-2
	IQSEC2	ENST00000375365.2	TSL:1	c.*589G>C		3_prime_UTR	Exon 14 of 14	ENSP00000364514.2	Q5JU85-3
	IQSEC2	ENST00000706952.1		c.4263G>C	p.Leu1421Leu	synonymous	Exon 15 of 15	ENSP00000516672.1	A0A9L9PY69

Frequencies

GnomAD3 genomes AF: 0.00 AC: 0 AN: 106739 Hom.: 0 Cov.: 20

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: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 34

GnomAD4 genome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 106739 Hom.: 0 Cov.: 20 AF XY: 0.00 AC XY: 0 AN XY: 29613

African (AFR) AF: 0.00 AC: 0 AN: 28831

American (AMR) AF: 0.00 AC: 0 AN: 10049

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 2610

East Asian (EAS) AF: 0.00 AC: 0 AN: 3384

South Asian (SAS) AF: 0.00 AC: 0 AN: 2411

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 5484

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 227

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 51670

Other (OTH) AF: 0.00 AC: 0 AN: 1427

Alfa AF: 0.00 Hom.: 1529

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.66
CADD	Benign	5.2
DANN	Benign	0.69
PhyloP100		-0.053
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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: rs184087864; hg19: chrX-53263764;