chr12-30631907-G-A

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BS1_Supporting

The NM_006390.4(IPO8):c.3004C>T(p.Arg1002Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000391 in 1,610,626 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R1002Q) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00018 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000025 ( 0 hom. )

Consequence

IPO8
NM_006390.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.939

Publications

2 publications found

Variant links:

Genes affected

IPO8 (HGNC:9853): (importin 8) The importin-alpha/beta complex and the GTPase Ran mediate nuclear import of proteins with a classical nuclear localization signal. The protein encoded by this gene is a member of a class of approximately 20 potential Ran targets that share a sequence motif related to the Ran-binding site of importin-beta. This protein binds to the nuclear pore complex and, along with RanGTP and RANBP1, inhibits the GAP stimulation of the Ran GTPase. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2010]

IPO8 Gene-Disease associations (from GenCC):

VISS syndrome
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P

IPO8 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -1 ACMG points.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.000177 (27/152160) while in subpopulation AFR AF = 0.000579 (24/41426). AF 95% confidence interval is 0.000399. There are 0 homozygotes in GnomAd4. There are 15 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IPO8	NM_006390.4 link	c.3004C>T	p.Arg1002Trp	missense_variant	Exon 24 of 25	ENST00000256079.9	NP_006381.2	O15397-1
IPO8	NM_001190995.2 link	c.2389C>T	p.Arg797Trp	missense_variant	Exon 20 of 21		NP_001177924.1	O15397-2
IPO8	XM_017018691.3 link	c.2953C>T	p.Arg985Trp	missense_variant	Exon 24 of 25		XP_016874180.1
IPO8	XM_017018692.2 link	c.2818C>T	p.Arg940Trp	missense_variant	Exon 23 of 24		XP_016874181.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
IPO8	ENST00000256079.9 link	c.3004C>T	p.Arg1002Trp	missense_variant	Exon 24 of 25	1	NM_006390.4	ENSP00000256079.4	O15397-1
IPO8	ENST00000544829.5 link	c.2389C>T	p.Arg797Trp	missense_variant	Exon 20 of 21	2		ENSP00000444520.1	O15397-2
IPO8	ENST00000535598.1 link	c.475C>T	p.Arg159Trp	missense_variant	Exon 3 of 3	3		ENSP00000446232.1	H0YH64

Frequencies

GnomAD3 genomes

AF:

0.000177

AC:

AN:

152160

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000579

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000360

AC:

AN:

249900

AF XY:

0.0000222

show subpopulations

Gnomad AFR exome

AF:

0.000308

Gnomad AMR exome

AF:

0.0000290

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000247

AC:

AN:

1458466

Hom.:

Cov.:

AF XY:

0.0000207

AC XY:

AN XY:

725664

show subpopulations

African (AFR)

AF:

0.000359

AC:

AN:

33400

American (AMR)

AF:

0.0000671

AC:

AN:

44678

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26096

East Asian (EAS)

AF:

0.000101

AC:

AN:

39670

South Asian (SAS)

AF:

0.0000348

AC:

AN:

86104

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52946

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4724

European-Non Finnish (NFE)

AF:

0.00000720

AC:

AN:

1110610

Other (OTH)

AF:

0.0000996

AC:

AN:

60238

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.483

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.000177

AC:

AN:

152160

Hom.:

Cov.:

AF XY:

0.000202

AC XY:

AN XY:

74338

show subpopulations

African (AFR)

AF:

0.000579

AC:

AN:

41426

American (AMR)

AF:

0.000131

AC:

AN:

15266

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5200

South Asian (SAS)

AF:

0.000207

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10612

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68034

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.481

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.000105

Hom.:

Bravo

AF:

0.000193

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Jan 31, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.3004C>T (p.R1002W) alteration is located in exon 24 (coding exon 24) of the IPO8 gene. This alteration results from a C to T substitution at nucleotide position 3004, causing the arginine (R) at amino acid position 1002 to be replaced by a tryptophan (W). 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

0.18

BayesDel_addAF

Benign

-0.19

BayesDel_noAF

Benign

-0.10

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.44

T;.

Eigen

Benign

0.040

Eigen_PC

Benign

-0.068

FATHMM_MKL

Benign

0.29

LIST_S2

Uncertain

0.95

D;D

M_CAP

Benign

0.055

MetaRNN

Uncertain

0.70

D;D

MetaSVM

Benign

-0.51

MutationAssessor

Uncertain

2.5

M;.

PhyloP100

0.94

PrimateAI

Uncertain

0.72

PROVEAN

Pathogenic

-5.0

D;D

REVEL

Uncertain

0.30

Sift

Uncertain

0.0010

D;D

Sift4G

Uncertain

0.0020

D;D

Polyphen

1.0

D;.

Vest4

0.71

MVP

0.63

MPC

0.68

ClinPred

0.87

GERP RS

2.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.45

gMVP

0.64

Mutation Taster

=72/28

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

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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chr12-30631907-G-A

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over