17-78138019-G-T

Position:

• chr17-78138019-G-T

Variant summary

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

The ENST00000318430.10(TMC8):​c.1364G>T​(p.Arg455Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 13/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R455Q) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: TMC8 ENST00000318430.10 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.38

Genes affected

TMC8 (HGNC:20474): (transmembrane channel like 8) Epidermodysplasia verruciformis (EV) is an autosomal recessive dermatosis characterized by abnormal susceptibility to human papillomaviruses (HPVs) and a high rate of progression to squamous cell carcinoma on sun-exposed skin. EV is caused by mutations in either of two adjacent genes located on chromosome 17q25.3. Both of these genes encode integral membrane proteins that localize to the endoplasmic reticulum and are predicted to form transmembrane channels. This gene encodes a transmembrane channel-like protein with 8 predicted transmembrane domains and 3 leucine zipper motifs. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TMC8	NM_152468.5	c.1364G>T	p.Arg455Leu	missense_variant	12/16	ENST00000318430.10	NP_689681.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TMC8	ENST00000318430.10	c.1364G>T	p.Arg455Leu	missense_variant	12/16	1	NM_152468.5	ENSP00000325561	P2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Benign	-0.086	T
BayesDel_noAF	Benign	-0.36
CADD	Benign	21
DANN	Benign	0.80
DEOGEN2	Benign	0.012	T;.
Eigen	Benign	-0.58
Eigen_PC	Benign	-0.57
FATHMM_MKL	Benign	0.34	N
LIST_S2	Benign	0.81	T;T
M_CAP	Benign	0.041	D
MetaRNN	Uncertain	0.67	D;D
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.6	L;.
MutationTaster	Benign	1.0	N;N
PrimateAI	Uncertain	0.53	T
PROVEAN	Uncertain	-2.4	N;.
REVEL	Benign	0.18
Sift	Benign	0.49	T;.
Sift4G	Benign	0.10	T;T
Polyphen		0.58	P;.
Vest4		0.50
MutPred		0.69		Loss of MoRF binding (P = 0.0409);.;
MVP		0.59
MPC		0.54
ClinPred		0.56	D
GERP RS		2.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.073
gMVP		0.35

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.13		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: rs151076155; hg19: chr17-76134100;