17-78117862-G-T

Variant names:

• chr17-78117862-G-T
• rs549556408
• NM_001127198.5:c.1961C>A

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001127198.5(TMC6):​c.1961C>A​(p.Thr654Lys) variant causes a missense change. The variant allele was found at a frequency of 0.00000206 in 1,455,692 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. T654M) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: TMC6 NM_001127198.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.06
• Publications: 0 publications found

Genes affected

TMC6 (HGNC:18021): (transmembrane channel like 6) 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 10 transmembrane domains and 2 leucine zipper motifs. [provided by RefSeq, Jul 2008]

TMC6 Gene-Disease associations (from GenCC):

• epidermodysplasia verruciformis, susceptibility to, 1

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

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001127198.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TMC6	NM_001127198.5	MANE Select	c.1961C>A	p.Thr654Lys	missense	Exon 16 of 20	NP_001120670.1	Q7Z403-1
	TMC6	NM_001321185.1		c.1961C>A	p.Thr654Lys	missense	Exon 16 of 20	NP_001308114.1	Q7Z403-1
	TMC6	NM_001374596.1		c.1961C>A	p.Thr654Lys	missense	Exon 16 of 20	NP_001361525.1	Q7Z403-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TMC6	ENST00000590602.6	TSL:2 MANE Select	c.1961C>A	p.Thr654Lys	missense	Exon 16 of 20	ENSP00000465261.1	Q7Z403-1
	TMC6	ENST00000322914.7	TSL:1	c.1961C>A	p.Thr654Lys	missense	Exon 16 of 20	ENSP00000313408.2	Q7Z403-1
	TMC6	ENST00000392467.7	TSL:1	c.1961C>A	p.Thr654Lys	missense	Exon 15 of 19	ENSP00000376260.2	Q7Z403-1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000206 AC: 3 AN: 1455692 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 723662

African (AFR) AF: 0.00 AC: 0 AN: 33436

American (AMR) AF: 0.00 AC: 0 AN: 43932

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25940

East Asian (EAS) AF: 0.00 AC: 0 AN: 39538

South Asian (SAS) AF: 0.00 AC: 0 AN: 85356

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52052

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5750

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1109540

Other (OTH) AF: 0.00 AC: 0 AN: 60148

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.75
BayesDel_addAF	Uncertain	0.057	T
BayesDel_noAF	Benign	-0.16
CADD	Pathogenic	28
DANN	Uncertain	0.98
DEOGEN2	Benign	0.15	T
Eigen	Benign	0.032
Eigen_PC	Benign	0.11
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.86	D
M_CAP	Benign	0.054	D
MetaRNN	Uncertain	0.58	D
MetaSVM	Benign	-0.68	T
MutationAssessor	Uncertain	2.5	M
PhyloP100		6.1
PrimateAI	Uncertain	0.49	T
PROVEAN	Uncertain	-3.9	D
REVEL	Uncertain	0.32
Sift	Benign	0.13	T
Sift4G	Benign	0.13	T
Polyphen		0.41	B
Vest4		0.66
MutPred		0.67		Gain of ubiquitination at T654 (P = 0.0258)
MVP		0.73
MPC		0.57
ClinPred		0.97	D
GERP RS		3.9
Varity_R		0.34
gMVP		0.71
Mutation Taster		=67/33	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.28		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.28		Position offset: -2

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

Other links and lift over

dbSNP: rs549556408; hg19: chr17-76113943;