chr7-99173794-C-T

Position:

• chr7-99173794-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001145715.3(KPNA7):​c.1465G>A​(p.Glu489Lys) variant causes a missense, splice region 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. 17/22 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: KPNA7 NM_001145715.3 missense, splice_region
• Scores: Splicing: ADA: 0.02475
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.50

Genes affected

KPNA7 (HGNC:21839): (karyopherin subunit alpha 7) 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, but exhibits different nuclear localization signal binding specificity compared to other members of the family. A pseudogene of this gene has been defined on chromosome 5. [provided by RefSeq, Jul 2016]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06666601).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KPNA7	NM_001145715.3	c.1465G>A	p.Glu489Lys	missense_variant, splice_region_variant	11/11	ENST00000327442.7	NP_001139187.1
KPNA7	XM_011516215.3	c.1546G>A	p.Glu516Lys	missense_variant, splice_region_variant	11/11		XP_011514517.1
KPNA7	XM_017012211.2	c.1545+4126G>A		intron_variant			XP_016867700.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KPNA7	ENST00000327442.7	c.1465G>A	p.Glu489Lys	missense_variant, splice_region_variant	11/11	1	NM_001145715.3	ENSP00000330878	P1
KPNA7	ENST00000681060.1	c.1465G>A	p.Glu489Lys	missense_variant, splice_region_variant	11/11			ENSP00000506489	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 25

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 24, 2021

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. This variant has not been reported in the literature in individuals affected with KPNA7-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 489 of the KPNA7 protein (p.Glu489Lys). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	-0.20	T
BayesDel_noAF	Benign	-0.53
CADD	Benign	22
DANN	Benign	0.97
DEOGEN2	Benign	0.014	T
Eigen	Benign	-0.48
Eigen_PC	Benign	-0.42
FATHMM_MKL	Uncertain	0.88	D
M_CAP	Benign	0.0095	T
MetaRNN	Benign	0.067	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.0	N
MutationTaster	Benign	0.96	D
PrimateAI	Benign	0.36	T
PROVEAN	Benign	-1.6	N
REVEL	Benign	0.14
Sift	Benign	0.13	T
Sift4G	Benign	0.13	T
Polyphen		0.0010	B
Vest4		0.25
MutPred		0.42		Gain of methylation at E489 (P = 0.0103);
MVP		0.072
ClinPred		0.22	T
GERP RS		3.0
Varity_R		0.089
gMVP		0.14

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.025
dbscSNV1_RF	Benign	0.27
SpliceAI score (max)		0.060		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr7-98771417; COSMIC: COSV104646695;