chr7-99173752-G-T

Position:

• chr7-99173752-G-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.1507C>A​(p.Gln503Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000643 in 1,399,418 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000064 (0 hom.)
• Consequence: KPNA7 NM_001145715.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.00700

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=0.0670425).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
KPNA7	NM_001145715.3	c.1507C>A	p.Gln503Lys	missense_variant	11/11	ENST00000327442.7	NP_001139187.1
KPNA7	XM_011516215.3	c.1588C>A	p.Gln530Lys	missense_variant	11/11		XP_011514517.1
KPNA7	XM_017012211.2	c.1545+4168C>A		intron_variant			XP_016867700.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
KPNA7	ENST00000327442.7	c.1507C>A	p.Gln503Lys	missense_variant	11/11	1	NM_001145715.3	ENSP00000330878	P1
KPNA7	ENST00000681060.1	c.1507C>A	p.Gln503Lys	missense_variant	11/11			ENSP00000506489	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000190 AC: 3 AN: 158136 Hom.: 0 AF XY: 0.0000240 AC XY: 2 AN XY: 83406

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: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000487

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000643 AC: 9 AN: 1399418 Hom.: 0 Cov.: 29 AF XY: 0.00000869 AC XY: 6 AN XY: 690188

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: 0.00000834

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ExAC AF: 0.0000789 AC: 2

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

Aug 28, 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 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. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the ExAC database. This sequence change replaces glutamine with lysine at codon 503 of the KPNA7 protein (p.Gln503Lys). The glutamine residue is weakly conserved and there is a small physicochemical difference between glutamine and lysine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.066
BayesDel_addAF	Benign	-0.43	T
BayesDel_noAF	Benign	-0.71
CADD	Benign	0.30
DANN	Benign	0.41
DEOGEN2	Benign	0.0063	T
Eigen	Benign	-1.5
Eigen_PC	Benign	-1.6
FATHMM_MKL	Benign	0.13	N
M_CAP	Benign	0.0027	T
MetaRNN	Benign	0.067	T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	0.0	N
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.28	T
PROVEAN	Benign	-0.20	N
REVEL	Benign	0.031
Sift	Benign	0.44	T
Sift4G	Benign	0.89	T
Polyphen		0.017	B
Vest4		0.24
MutPred		0.47		Gain of ubiquitination at Q503 (P = 0.009);
MVP		0.048
ClinPred		0.030	T
GERP RS		-6.7
Varity_R		0.040
gMVP		0.17

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

LitVar

Other links and lift over

dbSNP: rs774947420; hg19: chr7-98771375;