1-215786865-CTT-C

Position:

• chr1-215786865-CTT-C

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_206933.4(USH2A):​c.10190_10191del​(p.Lys3397ArgfsTer20) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,528 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: USH2A NM_206933.4 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 1.09

Genes affected

USH2A (HGNC:12601): (usherin) This gene encodes a protein that contains laminin EGF motifs, a pentaxin domain, and many fibronectin type III motifs. The protein is found in the basement membrane, and may be important in development and homeostasis of the inner ear and retina. Mutations within this gene have been associated with Usher syndrome type IIa and retinitis pigmentosa. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2008]

ACMG classification

Verdict is Pathogenic. Variant got 18 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 1-215786865-CTT-C is Pathogenic according to our data. Variant chr1-215786865-CTT-C is described in ClinVar as [Pathogenic]. Clinvar id is 48343.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-215786865-CTT-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
USH2A	NM_206933.4	c.10190_10191del	p.Lys3397ArgfsTer20	frameshift_variant	52/72	ENST00000307340.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
USH2A	ENST00000307340.8	c.10190_10191del	p.Lys3397ArgfsTer20	frameshift_variant	52/72	1	NM_206933.4	P1
USH2A	ENST00000674083.1	c.10190_10191del	p.Lys3397ArgfsTer20	frameshift_variant	52/73

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461528 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 727048

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Retinitis pigmentosa 39 Pathogenic:3

Likely pathogenic, no assertion criteria provided	clinical testing	Counsyl	Aug 24, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Dec 19, 2022	- -
Pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Nov 04, 2023	- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Eurofins Ntd Llc (ga)

Oct 01, 2015

- -

Rare genetic deafness Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Aug 26, 2011

The Lys3397fs variant in USH2A has been reported in 1 proband with Usher syndrom e type 2 (Sandberg, 2008; McGee 2010). The Lys3397fs variant is predicted to cau se a frameshift, which alters the protein's amino acid sequence beginning at cod on 3397 and leads to a premature stop codon 20 codons downstream. This alteratio n is then predicted to lead to a truncated or absent protein. In summary, this v ariant meets our criteria to be classified as pathogenic. -

Usher syndrome type 2A Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Genome-Nilou Lab

Nov 04, 2023

- -

Computational scores

Source: dbNSFP v4.3

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

Publications

LitVar

Other links and lift over

dbSNP: rs397517964; hg19: chr1-215960207;