chr7-129054743-G-A

Position:

• chr7-129054743-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_012470.4(TNPO3):​c.28C>T​(p.Leu10Phe) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. L10L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: TNPO3 NM_012470.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.10

Genes affected

TNPO3 (HGNC:17103): (transportin 3) The protein encoded by this gene is a nuclear import receptor for serine/arginine-rich (SR) proteins such as the splicing factors SFRS1 and SFRS2. The encoded protein has also been shown to be involved in HIV-1 infection, apparently through interaction with the HIV-1 capsid protein. Several protein-coding and non-coding transcript variants have been found for this gene. [provided by RefSeq, Apr 2020]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), TNPO3. . Gene score misZ 3.442 (greater than the threshold 3.09). Trascript score misZ 3.4155 (greater than threshold 3.09). GenCC has associacion of gene with autosomal dominant limb-girdle muscular dystrophy type 1F.
• BP4: Computational evidence support a benign effect (MetaRNN=0.29519063).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TNPO3	NM_012470.4	c.28C>T	p.Leu10Phe	missense_variant	1/23	ENST00000265388.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TNPO3	ENST00000265388.10	c.28C>T	p.Leu10Phe	missense_variant	1/23	1	NM_012470.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Autosomal dominant limb-girdle muscular dystrophy type 1F Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 16, 2017

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, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with TNPO3-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces leucine with phenylalanine at codon 10 of the TNPO3 protein (p.Leu10Phe). The leucine residue is moderately conserved and there is a small physicochemical difference between leucine and phenylalanine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.18
BayesDel_addAF	Uncertain	0.035	T
BayesDel_noAF	Benign	-0.19
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.068	T;T;.;T
Eigen	Uncertain	0.30
Eigen_PC	Uncertain	0.42
FATHMM_MKL	Benign	0.49	N
LIST_S2	Uncertain	0.90	D;D;D;.
M_CAP	Benign	0.049	D
MetaRNN	Benign	0.30	T;T;T;T
MetaSVM	Benign	-0.60	T
MutationAssessor	Benign	1.5	L;.;L;.
MutationTaster	Benign	0.99	D;D;D;D;D
PrimateAI	Pathogenic	0.79	T
PROVEAN	Benign	-1.4	N;.;N;N
REVEL	Benign	0.17
Sift	Benign	0.049	D;.;T;D
Sift4G	Benign	0.10	T;T;T;T
Polyphen		0.45	P;B;.;B
Vest4		0.40
MutPred		0.37		Gain of catalytic residue at L10 (P = 0.0346);Gain of catalytic residue at L10 (P = 0.0346);Gain of catalytic residue at L10 (P = 0.0346);Gain of catalytic residue at L10 (P = 0.0346);
MVP		0.71
MPC		1.5
ClinPred		0.91	D
GERP RS		5.5
Varity_R		0.56
gMVP		0.40

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		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: rs1554445896; hg19: chr7-128694797;