rs1555937168

Variant names:

• chrX-71224098-CTG-C
• rs1555937168
• NM_000166.6:c.394_395delTG

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000166.6(GJB1):​c.394_395delTG​(p.Trp132ValfsTer14) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 22)
• Consequence: GJB1 NM_000166.6 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3 U:2
• Conservation: PhyloP100: 8.02
• Publications: 0 publications found

Genes affected

GJB1 (HGNC:4283): (gap junction protein beta 1) This gene encodes a member of the gap junction protein family. The gap junction proteins are membrane-spanning proteins that assemble to form gap junction channels that facilitate the transfer of ions and small molecules between cells. According to sequence similarities at the nucleotide and amino acid levels, the gap junction proteins are divided into two categories, alpha and beta. Mutations in this gene cause X-linked Charcot-Marie-Tooth disease, an inherited peripheral neuropathy. Alternatively spliced transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Oct 2008]

GJB1 Gene-Disease associations (from GenCC):

• Charcot-Marie-Tooth disease X-linked dominant 1

  Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Orphanet
• X-linked progressive cerebellar ataxia

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 18 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 115 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-71224098-CTG-C is Pathogenic according to our data. Variant chrX-71224098-CTG-C is described in ClinVar as Pathogenic. ClinVar VariationId is 521808.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000166.6. 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
	GJB1	NM_000166.6	MANE Select	c.394_395delTG	p.Trp132ValfsTer14	frameshift	Exon 2 of 2	NP_000157.1	P08034
	GJB1	NM_001097642.3		c.394_395delTG	p.Trp132ValfsTer14	frameshift	Exon 2 of 2	NP_001091111.1	P08034
	GJB1	NM_001440770.1		c.394_395delTG	p.Trp132ValfsTer14	frameshift	Exon 3 of 3	NP_001427699.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GJB1	ENST00000361726.7	TSL:1 MANE Select	c.394_395delTG	p.Trp132ValfsTer14	frameshift	Exon 2 of 2	ENSP00000354900.6	P08034
	GJB1	ENST00000374029.2	TSL:5	c.394_395delTG	p.Trp132ValfsTer14	frameshift	Exon 2 of 2	ENSP00000363141.1	P08034
	GJB1	ENST00000447581.2	TSL:5	c.394_395delTG	p.Trp132ValfsTer14	frameshift	Exon 3 of 3	ENSP00000407223.2	P08034

Frequencies

GnomAD3 genomes Cov.: 22

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 22

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
1	1	-	Charcot-Marie-Tooth disease X-linked dominant 1 (2)
-	1	-	Charcot-Marie-Tooth disease (1)
1	-	-	Charcot-Marie-Tooth Neuropathy X (1)
1	-	-	Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		8.0
Mutation Taster		=0/200	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs1555937168; hg19: chrX-70443948;