Genetic Variant KPNA1:p.Thr52Ile (chr3-122467404-G-A) – ACMG Classification: Benign (-8 pts)

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_StrongBS2

The NM_002264.4(KPNA1):c.155C>T(p.Thr52Ile) variant causes a missense change. The variant allele was found at a frequency of 0.000028 in 1,608,722 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000033 ( 1 hom., cov: 32)

Exomes 𝑓: 0.000027 ( 0 hom. )

Consequence

KPNA1
NM_002264.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 6.06

Variant links:

Genes affected

KPNA1 (HGNC:6394): (karyopherin subunit alpha 1) The transport of molecules between the nucleus and the cytoplasm in eukaryotic cells is mediated by the nuclear pore complex (NPC), which consists of 60-100 proteins. Small molecules (up to 70 kD) can pass through the nuclear pore by nonselective diffusion while larger molecules are transported by an active process. The protein encoded by this gene belongs to the importin alpha family, and is involved in nuclear protein import. This protein interacts with the recombination activating gene 1 (RAG1) protein and is a putative substrate of the RAG1 ubiquitin ligase. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Nov 2012]

KPNA1 links:

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ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -8 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.05278009).

BS2

High AC in GnomAd4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KPNA1	NM_002264.4 link	c.155C>T	p.Thr52Ile	missense_variant	Exon 3 of 14	ENST00000344337.11	NP_002255.3	P52294
KPNA1	XM_005247437.5 link	c.155C>T	p.Thr52Ile	missense_variant	Exon 3 of 14		XP_005247494.1	P52294
KPNA1	XM_024453514.2 link	c.155C>T	p.Thr52Ile	missense_variant	Exon 3 of 14		XP_024309282.1
KPNA1	NR_026698.2 link	n.343C>T		non_coding_transcript_exon_variant	Exon 3 of 15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KPNA1	ENST00000344337.11 link	c.155C>T	p.Thr52Ile	missense_variant	Exon 3 of 14	1	NM_002264.4	ENSP00000343701.6		P52294

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152138

Hom.:

Cov.:

show subpopulations

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:

0.00104

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000480

AC:

AN:

250054

Hom.:

AF XY:

0.0000666

AC XY:

AN XY:

135198

show subpopulations

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:

0.000198

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000529

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000275

AC:

AN:

1456466

Hom.:

Cov.:

AF XY:

0.0000359

AC XY:

AN XY:

724808

show subpopulations

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:

0.000128

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000226

Gnomad4 OTH exome

AF:

0.0000499

GnomAD4 genome

AF:

0.0000328

AC:

AN:

152256

Hom.:

Cov.:

AF XY:

0.0000537

AC XY:

AN XY:

74436

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000829

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000227

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000494

AC:

EpiCase

AF:

0.000164

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Feb 06, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.155C>T (p.T52I) alteration is located in exon 3 (coding exon 2) of the KPNA1 gene. This alteration results from a C to T substitution at nucleotide position 155, causing the threonine (T) at amino acid position 52 to be replaced by an isoleucine (I). 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

0.13

BayesDel_addAF

Benign

-0.30

BayesDel_noAF

Benign

-0.38

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.076

T;.;.;T;T

Eigen

Benign

-0.16

Eigen_PC

Benign

0.041

FATHMM_MKL

Uncertain

0.89

LIST_S2

Uncertain

0.93

D;D;D;D;D

M_CAP

Benign

0.0038

MetaRNN

Benign

0.053

T;T;T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.68

N;.;.;.;.

PrimateAI

Pathogenic

0.81

PROVEAN

Benign

0.75

N;N;N;N;N

REVEL

Benign

0.15

Sift

Benign

0.26

T;T;T;T;T

Sift4G

Benign

0.43

T;.;.;T;.

Polyphen

0.0

B;.;.;.;.

Vest4

0.35

MVP

0.61

MPC

0.95

ClinPred

0.14

GERP RS

4.6

RBP_binding_hub_radar

0.92

RBP_regulation_power_radar

2.6

Varity_R

0.080

gMVP

0.30

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over