chr3-122496474-T-C

Position:

• chr3-122496474-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_002264.4(KPNA1):​c.92A>G​(p.Glu31Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,654 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: KPNA1 NM_002264.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.61

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KPNA1	NM_002264.4	c.92A>G	p.Glu31Gly	missense_variant	2/14	ENST00000344337.11
KPNA1	XM_005247437.5	c.92A>G	p.Glu31Gly	missense_variant	2/14
KPNA1	XM_024453514.2	c.92A>G	p.Glu31Gly	missense_variant	2/14
KPNA1	NR_026698.2	n.280A>G		non_coding_transcript_exon_variant	2/15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KPNA1	ENST00000344337.11	c.92A>G	p.Glu31Gly	missense_variant	2/14	1	NM_002264.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461654 Hom.: 0 Cov.: 30 AF XY: 0.00000275 AC XY: 2 AN XY: 727154

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.000224 Hom.: 0

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

Jan 22, 2024

The c.92A>G (p.E31G) alteration is located in exon 2 (coding exon 1) of the KPNA1 gene. This alteration results from a A to G substitution at nucleotide position 92, causing the glutamic acid (E) at amino acid position 31 to be replaced by a glycine (G). 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	Pathogenic	0.62
BayesDel_addAF	Uncertain	0.038	T
BayesDel_noAF	Benign	-0.18
CADD	Pathogenic	29
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.29	T;.;.;T;T
Eigen	Uncertain	0.67
Eigen_PC	Pathogenic	0.67
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.96	D;D;D;D;D
M_CAP	Benign	0.016	T
MetaRNN	Uncertain	0.52	D;D;D;D;D
MetaSVM	Benign	-0.98	T
MutationAssessor	Benign	2.0	M;.;.;.;.
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.74	T
PROVEAN	Pathogenic	-4.7	D;D;D;D;D
REVEL	Benign	0.22
Sift	Benign	0.14	T;T;T;D;D
Sift4G	Benign	0.39	T;.;.;T;.
Polyphen		1.0	D;.;.;.;.
Vest4		0.61
MutPred		0.46		Gain of MoRF binding (P = 0.023);Gain of MoRF binding (P = 0.023);Gain of MoRF binding (P = 0.023);Gain of MoRF binding (P = 0.023);Gain of MoRF binding (P = 0.023);
MVP		0.57
MPC		2.1
ClinPred		0.99	D
GERP RS		5.4
Varity_R		0.81
gMVP		0.54

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: rs1278018384; hg19: chr3-122215321;