20-2558633-A-G

Variant summary

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

The NM_080751.3(TMC2):c.260A>G(p.Glu87Gly) variant causes a missense 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. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: TMC2 NM_080751.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.516

Genes affected

TMC2 (HGNC:16527): (transmembrane channel like 2) This gene encodes a transmembrane protein that is necesssary for mechanotransduction in cochlear hair cells of the inner ear. Mutations in this gene may underlie hereditary disorders of balance and hearing. [provided by RefSeq, Aug 2015]

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=0.056516796).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TMC2	NM_080751.3	c.260A>G	p.Glu87Gly	missense_variant	3/20	ENST00000358864.2
TMC2	XM_005260660.5	c.335A>G	p.Glu112Gly	missense_variant	1/18
TMC2	XR_001754152.2	n.469A>G		non_coding_transcript_exon_variant	1/13

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
TMC2	ENST00000358864.2	c.260A>G	p.Glu87Gly	missense_variant	3/20	1	NM_080751.3	P1
TMC2	ENST00000644205.1	n.419A>G		non_coding_transcript_exon_variant	1/15

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 33

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

Ambry Genetics

Mar 24, 2023

The c.260A>G (p.E87G) alteration is located in exon 3 (coding exon 3) of the TMC2 gene. This alteration results from a A to G substitution at nucleotide position 260, causing the glutamic acid (E) at amino acid position 87 to be replaced by a glycine (G). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.057
BayesDel_addAF	Benign	-0.33	T
BayesDel_noAF	Benign	-0.71
Cadd	Benign	13
Dann	Benign	0.94
DEOGEN2	Benign	0.0045	T
Eigen	Benign	-0.98
Eigen_PC	Benign	-0.96
FATHMM_MKL	Benign	0.069	N
LIST_S2	Benign	0.38	T
M_CAP	Benign	0.0062	T
MetaRNN	Benign	0.057	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.1	L
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.25	T
PROVEAN	Benign	-1.0	N
REVEL	Benign	0.046
Sift	Benign	0.20	T
Sift4G	Benign	0.20	T
Polyphen		0.0	B
Vest4		0.065
MutPred		0.23		Loss of helix (P = 0.0123);
MVP		0.23
MPC		0.15
ClinPred		0.072	T
GERP RS		3.4
Varity_R		0.054
gMVP		0.14

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr20-2539279;