Genetic Variant IQSEC2:p.Ala547Ala (chrX-53250935-C-T) – ACMG Classification: Benign (-19 pts)

Variant summary

Our verdict is Benign. The variant received -19 ACMG points: 0P and 19B. BP4_ModerateBP6_Very_StrongBP7BA1

The NM_001111125.3(IQSEC2):c.1641G>A(p.Ala547Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00389 in 1,199,171 control chromosomes in the GnomAD database, including 108 homozygotes. There are 1,213 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.020 ( 56 hom., 603 hem., cov: 23)

Exomes 𝑓: 0.0022 ( 52 hom. 610 hem. )

Consequence

IQSEC2
NM_001111125.3 synonymous

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:6

Conservation

PhyloP100: 0.929

Publications

0 publications found

Variant links:

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: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
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

IQSEC2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -19 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.46).

BP6

Variant X-53250935-C-T is Benign according to our data. Variant chrX-53250935-C-T is described in ClinVar as Benign. ClinVar VariationId is 129280.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=0.929 with no splicing effect.

BA1

GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0671 is higher than 0.05.

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

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
IQSEC2	NM_001111125.3	MANE Select	c.1641G>A	p.Ala547Ala	synonymous	Exon 5 of 15	NP_001104595.1	Q5JU85-2
IQSEC2	NM_001441092.1		c.1641G>A	p.Ala547Ala	synonymous	Exon 5 of 14	NP_001428021.1
IQSEC2	NM_001410736.1		c.1641G>A	p.Ala547Ala	synonymous	Exon 5 of 14	NP_001397665.1	A0A1W2PR28

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
IQSEC2	ENST00000642864.1	MANE Select	c.1641G>A	p.Ala547Ala	synonymous	Exon 5 of 15	ENSP00000495726.1	Q5JU85-2
IQSEC2	ENST00000375365.2	TSL:1	c.1026G>A	p.Ala342Ala	synonymous	Exon 5 of 14	ENSP00000364514.2	Q5JU85-3
IQSEC2	ENST00000706952.1		c.1800G>A	p.Ala600Ala	synonymous	Exon 5 of 15	ENSP00000516672.1	A0A9L9PY69

Frequencies

GnomAD3 genomes

AF:

0.0202

AC:

2273

AN:

112455

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0698

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00754

Gnomad ASJ

AF:

0.000756

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000731

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000169

Gnomad OTH

AF:

0.0126

GnomAD2 exomes

AF:

0.00641

AC:

1041

AN:

162299

AF XY:

0.00386

show subpopulations

Gnomad AFR exome

AF:

0.0780

Gnomad AMR exome

AF:

0.00480

Gnomad ASJ exome

AF:

0.00106

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000270

Gnomad OTH exome

AF:

0.00318

GnomAD4 exome

AF:

0.00221

AC:

2400

AN:

1086666

Hom.:

Cov.:

AF XY:

0.00171

AC XY:

610

AN XY:

356188

show subpopulations

African (AFR)

AF:

0.0699

AC:

1834

AN:

26232

American (AMR)

AF:

0.00538

AC:

183

AN:

34045

Ashkenazi Jewish (ASJ)

AF:

0.000583

AC:

AN:

18879

East Asian (EAS)

AF:

0.00

AC:

AN:

29687

South Asian (SAS)

AF:

0.000134

AC:

AN:

52261

European-Finnish (FIN)

AF:

0.00

AC:

AN:

39211

Middle Eastern (MID)

AF:

0.00292

AC:

AN:

3421

European-Non Finnish (NFE)

AF:

0.000130

AC:

109

AN:

837386

Other (OTH)

AF:

0.00540

AC:

246

AN:

45544

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.486

Heterozygous variant carriers

114

229

343

458

572

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

124

186

248

310

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0202

AC:

2270

AN:

112505

Hom.:

Cov.:

AF XY:

0.0174

AC XY:

603

AN XY:

34731

show subpopulations

African (AFR)

AF:

0.0696

AC:

2158

AN:

31026

American (AMR)

AF:

0.00744

AC:

AN:

10754

Ashkenazi Jewish (ASJ)

AF:

0.000756

AC:

AN:

2645

East Asian (EAS)

AF:

0.00

AC:

AN:

3542

South Asian (SAS)

AF:

0.000733

AC:

AN:

2728

European-Finnish (FIN)

AF:

0.00

AC:

AN:

6252

Middle Eastern (MID)

AF:

0.00

AC:

AN:

214

European-Non Finnish (NFE)

AF:

0.000169

AC:

AN:

53131

Other (OTH)

AF:

0.0124

AC:

AN:

1530

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.494

Heterozygous variant carriers

168

253

337

421

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

120

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0131

Hom.:

Bravo

AF:

0.0240

ClinVar

ClinVar submissions as Germline

Significance:Benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (2)

not specified (2)

Inborn genetic diseases (1)

Intellectual disability, X-linked 1 (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.46

CADD

Benign

2.4

(source)

DANN

Benign

0.80

PhyloP100

0.93

PromoterAI

0.0024

Neutral

(source)

Mutation Taster

=100/0

polymorphism (auto)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over