chr17-78120836-C-T

Variant names:

• chr17-78120836-C-T
• rs117553598
• NM_001127198.5:c.1536-4G>A

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_001127198.5(TMC6):​c.1536-4G>A variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00412 in 1,611,704 control chromosomes in the GnomAD database, including 17 homozygotes. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0027 (2 hom., cov: 32)
  • Exomes 𝑓: 0.0043 (15 hom.)
• Consequence: TMC6 NM_001127198.5 splice_region, intron
• Scores: Splicing: ADA: 0.00001680
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: -9.07
• Publications: 2 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: Benign. The variant received -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).
• BP6: Variant 17-78120836-C-T is Benign according to our data. Variant chr17-78120836-C-T is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 526253.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.00269 (410/152242) while in subpopulation NFE AF = 0.00418 (284/68014). AF 95% confidence interval is 0.00378. There are 2 homozygotes in GnomAd4. There are 190 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.
• BS2: High Homozygotes in GnomAd4 at 2 AR gene

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.1536-4G>A		splice_region intron	N/A	NP_001120670.1	Q7Z403-1
	TMC6	NM_001321185.1		c.1536-4G>A		splice_region intron	N/A	NP_001308114.1	Q7Z403-1
	TMC6	NM_001374596.1		c.1536-4G>A		splice_region intron	N/A	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.1536-4G>A		splice_region intron	N/A	ENSP00000465261.1	Q7Z403-1
	TMC6	ENST00000322914.7	TSL:1	c.1536-4G>A		splice_region intron	N/A	ENSP00000313408.2	Q7Z403-1
	TMC6	ENST00000392467.7	TSL:1	c.1536-4G>A		splice_region intron	N/A	ENSP00000376260.2	Q7Z403-1

Frequencies

GnomAD3 genomes AF: 0.00270 AC: 410 AN: 152124 Hom.: 2 Cov.: 32

Gnomad AFR AF: 0.000580

Gnomad AMI AF: 0.00439

Gnomad AMR AF: 0.00183

Gnomad ASJ AF: 0.0133

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00228

Gnomad FIN AF: 0.000472

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.00418

Gnomad OTH AF: 0.00335

GnomAD2 exomes AF: 0.00333 AC: 830 AN: 249246 AF XY: 0.00346

Gnomad AFR exome AF: 0.000807

Gnomad AMR exome AF: 0.00162

Gnomad ASJ exome AF: 0.0159

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.000883

Gnomad NFE exome AF: 0.00387

Gnomad OTH exome AF: 0.00459

GnomAD4 exome AF: 0.00427 AC: 6232 AN: 1459462 Hom.: 15 Cov.: 32 AF XY: 0.00420 AC XY: 3045 AN XY: 725706

African (AFR) AF: 0.00131 AC: 44 AN: 33460

American (AMR) AF: 0.00154 AC: 69 AN: 44704

Ashkenazi Jewish (ASJ) AF: 0.0164 AC: 427 AN: 26098

East Asian (EAS) AF: 0.000126 AC: 5 AN: 39674

South Asian (SAS) AF: 0.00411 AC: 354 AN: 86232

European-Finnish (FIN) AF: 0.00112 AC: 59 AN: 52538

Middle Eastern (MID) AF: 0.00469 AC: 27 AN: 5762

European-Non Finnish (NFE) AF: 0.00446 AC: 4956 AN: 1110692

Other (OTH) AF: 0.00483 AC: 291 AN: 60302

GnomAD4 genome AF: 0.00269 AC: 410 AN: 152242 Hom.: 2 Cov.: 32 AF XY: 0.00255 AC XY: 190 AN XY: 74434

African (AFR) AF: 0.000578 AC: 24 AN: 41530

American (AMR) AF: 0.00183 AC: 28 AN: 15302

Ashkenazi Jewish (ASJ) AF: 0.0133 AC: 46 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5188

South Asian (SAS) AF: 0.00228 AC: 11 AN: 4824

European-Finnish (FIN) AF: 0.000472 AC: 5 AN: 10598

Middle Eastern (MID) AF: 0.00340 AC: 1 AN: 294

European-Non Finnish (NFE) AF: 0.00418 AC: 284 AN: 68014

Other (OTH) AF: 0.00332 AC: 7 AN: 2110

Alfa AF: 0.00424 Hom.: 0

Bravo AF: 0.00295

Asia WGS AF: 0.00115 AC: 5 AN: 3478

EpiCase AF: 0.00442

EpiControl AF: 0.00433

ClinVar

ClinVar submissions

Significance: Benign/Likely benign

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	-	4	not provided (4)
-	-	1	Epidermodysplasia verruciformis (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	0.0070
DANN	Benign	0.89
PhyloP100		-9.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.2
Mutation Taster		=100/0	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000017
dbscSNV1_RF	Benign	0.0
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

Other links and lift over

dbSNP: rs117553598; hg19: chr17-76116917; COSMIC: COSV108106365;