chr17-74920441-A-AC

Variant names:

• chr17-74920441-A-AC
• rs587776546
• NM_173477.5:c.394dupG

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_173477.5(USH1G):​c.394dupG​(p.Val132GlyfsTer3) 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 (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: USH1G NM_173477.5 frameshift
• Clinical Significance: Pathogenic no assertion criteria provided P:1 O:1
• Conservation: PhyloP100: 7.86
• Publications: 3 publications found

Genes affected

USH1G (HGNC:16356): (USH1 protein network component sans) This gene encodes a protein that contains three ankyrin domains, a class I PDZ-binding motif and a sterile alpha motif. The encoded protein interacts with harmonin, which is associated with Usher syndrome type 1C. This protein plays a role in the development and maintenance of the auditory and visual systems and functions in the cohesion of hair bundles formed by inner ear sensory cells. Mutations in this gene are associated with Usher syndrome type 1G (USH1G). Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2013]

USH1G Gene-Disease associations (from GenCC):

• Usher syndrome type 1G

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae), Laboratory for Molecular Medicine
• Usher syndrome type 1

  Inheritance: Unknown, AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• nonsyndromic genetic hearing loss

  Inheritance: AR Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 17-74920441-A-AC is Pathogenic according to our data. Variant chr17-74920441-A-AC is described in ClinVar as Pathogenic. ClinVar VariationId is 2917.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_173477.5. 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
	USH1G	NM_173477.5	MANE Select	c.394dupG	p.Val132GlyfsTer3	frameshift	Exon 2 of 3	NP_775748.2
	USH1G	NM_001282489.3		c.85dupG	p.Val29GlyfsTer3	frameshift	Exon 2 of 3	NP_001269418.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	USH1G	ENST00000614341.5	TSL:1 MANE Select	c.394dupG	p.Val132GlyfsTer3	frameshift	Exon 2 of 3	ENSP00000480279.1	Q495M9
	USH1G	ENST00000579243.1	TSL:2	n.341dupG		non_coding_transcript_exon	Exon 2 of 3	ENSP00000462568.1	J3KSN5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 42

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	Usher syndrome type 1G (1)
-	-	-	Usher syndrome type 1 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		7.9
Mutation Taster		=1/199	disease causing (ClinVar)

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: rs587776546; hg19: chr17-72916536;