chr17-74922965-GA-G

Position:

• chr17-74922965-GA-G

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_173477.5(USH1G):​c.108delT​(p.Leu37fs) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 31)
• Consequence: USH1G NM_173477.5 frameshift
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: -0.172

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]

OTOP2 (HGNC:19657): (otopetrin 2) Predicted to enable proton channel activity. Predicted to be involved in proton transmembrane transport. Predicted to be located in plasma membrane. Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Pathogenic. Variant got 12 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 17-74922965-GA-G is Pathogenic according to our data. Variant chr17-74922965-GA-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 3601023.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
USH1G	NM_173477.5	c.108delT	p.Leu37fs	frameshift_variant	1/3	ENST00000614341.5	NP_775748.2
USH1G	NM_001282489.3	c.-149delT		5_prime_UTR_variant	1/3		NP_001269418.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
USH1G	ENST00000614341.5	c.108delT	p.Leu37fs	frameshift_variant	1/3	1	NM_173477.5	ENSP00000480279.1
OTOP2	ENST00000580223	c.-299delA		5_prime_UTR_variant	1/5	1		ENSP00000463837.2
USH1G	ENST00000579243.1	n.108delT		non_coding_transcript_exon_variant	1/3	2		ENSP00000462568.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Usher syndrome type 1G Pathogenic:1

Likely pathogenic, criteria provided, single submitter

research

Institute of Rare Diseases, West China Hospital, Sichuan University

Jan 09, 2025

PVS1;PM2_Supporting -

Computational scores

Source: dbNSFP v4.3

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr17-72919060;