17-78139321-G-C

Variant names:

• chr17-78139321-G-C
• rs17773842
• NM_152468.5:c.1902+81G>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_152468.5(TMC8):​c.1902+81G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000732 in 1,367,034 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 7.3e-7 (0 hom.)
• Consequence: TMC8 NM_152468.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.35
• Publications: 0 publications found

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]

TMC8 Gene-Disease associations (from GenCC):

• epidermodysplasia verruciformis, susceptibility to, 2

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, Genomics England PanelApp
• epidermodysplasia verruciformis

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.83).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TMC8	NM_152468.5	c.1902+81G>C		intron_variant	Intron 15 of 15	ENST00000318430.10	NP_689681.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TMC8	ENST00000318430.10	c.1902+81G>C		intron_variant	Intron 15 of 15	1	NM_152468.5	ENSP00000325561.4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 7.32e-7 AC: 1 AN: 1367034 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 683402

African (AFR) AF: 0.00 AC: 0 AN: 31482

American (AMR) AF: 0.00 AC: 0 AN: 42608

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25476

East Asian (EAS) AF: 0.00 AC: 0 AN: 38728

South Asian (SAS) AF: 0.0000120 AC: 1 AN: 83628

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 46286

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4200

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1037354

Other (OTH) AF: 0.00 AC: 0 AN: 57272

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.83
CADD	Benign	3.6
DANN	Benign	0.62
PhyloP100		1.4

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs17773842; hg19: chr17-76135402;