rs782299333

chr21-44499868-G-Cchr21-44499868-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_144991.3(TSPEAR):c.1925C>G(p.Ala642Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000551 in 1,452,958 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A642V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: TSPEAR NM_144991.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.91

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2482054).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TSPEAR	NM_144991.3	c.1925C>G	p.Ala642Gly	missense_variant	12/12	ENST00000323084.9
TSPEAR	NM_001272037.2	c.1721C>G	p.Ala574Gly	missense_variant	13/13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TSPEAR	ENST00000323084.9	c.1925C>G	p.Ala642Gly	missense_variant	12/12	1	NM_144991.3	P1
TSPEAR	ENST00000642437.1	c.*1870C>G		3_prime_UTR_variant, NMD_transcript_variant	13/13

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000551 AC: 8 AN: 1452958 Hom.: 0 Cov.: 31 AF XY: 0.00000692 AC XY: 5 AN XY: 722188

Gnomad4 AFR exome AF: 0.0000302

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: 0.00000271

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

Bravo AF: 0.0000151

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

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

May 28, 2015

The p.Ala642Gly variant in TSPEAR has not been previously reported in individual s with hearing loss. Data from large population studies are insufficient to asse ss the frequency of this variant. Computational prediction tools and conservatio n analyses do not provide strong support for or against an impact to the protein . In summary, the clinical significance of the Ala642Gly variant is uncertain. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.57
Cadd	Benign	23
Dann	Uncertain	0.99
DEOGEN2	Benign	0.11	T;T
Eigen	Benign	0.18
Eigen_PC	Benign	0.19
FATHMM_MKL	Benign	0.49	N
M_CAP	Benign	0.026	D
MetaRNN	Benign	0.25	T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.1	M;M
MutationTaster	Benign	0.64	N
PrimateAI	Benign	0.35	T
Polyphen		0.84	P;P
Vest4		0.20
MutPred		0.51		Loss of stability (P = 0.0686);Loss of stability (P = 0.0686);
MVP		0.13
MPC		0.074
ClinPred		0.73	D
GERP RS		4.3
Varity_R		0.21
gMVP		0.41

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: rs782299333; hg19: chr21-45919751;