chr21-44567957-G-A

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_144991.3(TSPEAR):c.131C>T(p.Ala44Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000634 in 1,576,776 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000064 ( 1 hom. )

Consequence

TSPEAR
NM_144991.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 0.819

Variant links:

Genes affected

TSPEAR (HGNC:1268): (thrombospondin type laminin G domain and EAR repeats) This gene encodes a protein that contains a N-terminal thrombospondin-type laminin G domain and several tandem arranged epilepsy-associated repeats (EARs). A mutation in this gene is the cause of autosomal recessive deafness-98. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Dec 2012]

TSPEAR links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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=0.014747202).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TSPEAR	NM_144991.3 link	c.131C>T	p.Ala44Val	missense_variant	Exon 2 of 12	ENST00000323084.9	NP_659428.2	Q8WU66-1
TSPEAR	NM_001272037.2 link	c.-74C>T		5_prime_UTR_variant	Exon 3 of 13		NP_001258966.1	Q8WU66

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
TSPEAR	ENST00000323084.9 link	c.131C>T	p.Ala44Val	missense_variant	Exon 2 of 12	1	NM_144991.3	ENSP00000321987.4	Q8WU66-1
TSPEAR	ENST00000397916.1 link	n.86C>T		non_coding_transcript_exon_variant	Exon 2 of 11	1
TSPEAR	ENST00000642437.1 link	n.*76C>T		non_coding_transcript_exon_variant	Exon 3 of 13			ENSP00000496535.1	A0A2R8YFK6
TSPEAR	ENST00000642437.1 link	n.*76C>T		3_prime_UTR_variant	Exon 3 of 13			ENSP00000496535.1	A0A2R8YFK6

Frequencies

GnomAD3 genomes

AF:

0.0000592

AC:

AN:

152128

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000385

Gnomad SAS

AF:

0.00104

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000198

AC:

AN:

231914

Hom.:

AF XY:

0.000303

AC XY:

AN XY:

125554

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000702

Gnomad SAS exome

AF:

0.00120

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000183

GnomAD4 exome

AF:

0.0000639

AC:

AN:

1424530

Hom.:

Cov.:

AF XY:

0.000108

AC XY:

AN XY:

705180

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000335

Gnomad4 SAS exome

AF:

0.000820

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

9.19e-7

Gnomad4 OTH exome

AF:

0.000136

GnomAD4 genome

AF:

0.0000591

AC:

AN:

152246

Hom.:

Cov.:

AF XY:

0.0000940

AC XY:

AN XY:

74460

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000386

Gnomad4 SAS

AF:

0.00104

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.0000315

Hom.:

Bravo

AF:

0.0000151

ExAC

AF:

0.000140

AC:

Asia WGS

AF:

0.000866

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Oct 20, 2015

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant classified as Uncertain Significance - Favor Benign. The p.Ala44Val vari ant in TSPEAR has not been previously reported in individuals with hearing loss, but has been identified in 0.1% (12/12560) of South Asian chromosomes by the Ex ome Aggregation Consortium (ExAC, http://exac.broadinstitute.org; dbSNP rs145231 394). This variant is not conserved across species. Of note, 2 mammals (pig an d white rhinoceros) and 5 reptiles have a valine (Val) at this position, suggest ing that the change at this position may be tolerated. In addition, computation al prediction tools suggest that the p.Ala44Val variant may not impact the prote in, though this information is not predictive enough to rule out pathogenicity. In summary, while the clinical significance of the p.Ala44Val variant is uncert ain, the available data suggest that it is more likely to be benign. -

Inborn genetic diseases

Uncertain:1

Dec 12, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.131C>T (p.A44V) alteration is located in exon 2 (coding exon 2) of the TSPEAR gene. This alteration results from a C to T substitution at nucleotide position 131, causing the alanine (A) at amino acid position 44 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Mar 11, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The valine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. ClinVar contains an entry for this variant (Variation ID: 229371). This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 44 of the TSPEAR protein (p.Ala44Val). This variant is present in population databases (rs145231394, gnomAD 0.1%). This variant has not been reported in the literature in individuals affected with TSPEAR-related conditions. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.082

BayesDel_addAF

Benign

-0.63

BayesDel_noAF

Benign

-0.72

CADD

Benign

9.0

DANN

Uncertain

0.97

DEOGEN2

Benign

0.020

T;T

Eigen

Benign

-0.65

Eigen_PC

Benign

-0.64

FATHMM_MKL

Benign

0.048

LIST_S2

Benign

0.54

.;T

M_CAP

Benign

0.016

MetaRNN

Benign

0.015

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.2

L;L

PrimateAI

Benign

0.35

PROVEAN

Benign

-0.64

.;N

REVEL

Benign

0.075

Sift

Benign

0.34

.;T

Sift4G

Benign

0.33

T;T

Polyphen

0.0060

B;B

Vest4

0.18

MutPred

0.32

Gain of sheet (P = 0.0827);Gain of sheet (P = 0.0827);

MVP

0.14

MPC

0.050

ClinPred

0.013

GERP RS

3.9

Varity_R

0.065

gMVP

0.24

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