1-215674103-T-G

Variant names:

• chr1-215674103-T-G
• rs727504551
• NM_206933.4:c.13808A>C

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM3_Strong PP4 PM2_Supporting

This summary comes from the ClinGen Evidence Repository: The c.13808A>C (p.His4603Pro) variant in USH2A is a missense variant predicted to cause a substitution of histidine by a proline at amino acid 4603. The highest population minor allele frequency in gnomAD v4.1.0 is 0.00000084 (4/1179986 alleles) in the european non-finnish population, which is lower than the ClinGen Hearing Loss VCEP threshold (<0.00007) for PM2_Supporting, meeting this criterion (PM2_Supporting). The computational predictor REVEL gives a score of 0.34, which is neither above nor below the thresholds predicting a damaging or benign impact on USH2A function. This variant has been detected in 1 proband with retinal disease and hearing loss (which was diagnosed at the age of 49 years old) in trans with a pathogenic variant by family testing (PMID:28157192). Besides, this variant has been detected in 4 individuals with USH2A associated conditions which is highly specific for disease (PP4). All individuals were heterozygous for the variant and a pathogenic or likely pathogenic variant with phase unknown (c.2299del, p.(Glu767Serfs*21); c.5118G>A, p.(Trp1706*); c.2276G>T, p.(Cys759Phe) and c.5573-834A>G; PM3 3 points, Blueprint Genetics internal evidence SCV001239096.1) (PM3_Strong). In summary, this variant meets the criteria to be classified as likely pathogenic for autosomal recessive USH2A condition (isolated RP) based on the ACMG/AMP criteria applied, as specified by the ClinGen Hearing Loss VCEP: PM2_P, PM3_Strong and PP4. (ClinGen Hearing Loss VCEP specifications version 2, 20.11.2024). LINK:https://erepo.genome.network/evrepo/ui/classification/CA183350/MONDO:0019501/005

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: USH2A NM_206933.4 missense
• Clinical Significance: Likely pathogenic reviewed by expert panel P:3 U:2
• Conservation: PhyloP100: 2.08
• Publications: 1 publications found

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]

USH2A Gene-Disease associations (from GenCC):

• Usher syndrome type 2A

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• Usher syndrome type 2

  Inheritance: Unknown, AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• retinitis pigmentosa 39

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• retinitis pigmentosa

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PM3: For more information check the summary or visit ClinGen Evidence Repository.
• PP4: For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_206933.4. 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
	USH2A	NM_206933.4	MANE Select	c.13808A>C	p.His4603Pro	missense	Exon 63 of 72	NP_996816.3	O75445-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	USH2A	ENST00000307340.8	TSL:1 MANE Select	c.13808A>C	p.His4603Pro	missense	Exon 63 of 72	ENSP00000305941.3	O75445-1
	USH2A	ENST00000674083.1		c.13808A>C	p.His4603Pro	missense	Exon 63 of 73	ENSP00000501296.1	O75445-3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461772 Hom.: 0 Cov.: 30 AF XY: 0.00000275 AC XY: 2 AN XY: 727192

African (AFR) AF: 0.00 AC: 0 AN: 33476

American (AMR) AF: 0.00 AC: 0 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39694

South Asian (SAS) AF: 0.00 AC: 0 AN: 86212

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53416

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000360 AC: 4 AN: 1111968

Other (OTH) AF: 0.00 AC: 0 AN: 60386

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Likely pathogenic

Revision: reviewed by expert panel

Pathogenic	VUS	Benign	Condition
1	-	-	not provided (1)
-	1	-	not specified (1)
1	-	-	Retinal dystrophy (1)
1	-	-	Usher syndrome (1)
-	1	-	Usher syndrome type 2A;C3151138:Retinitis pigmentosa 39 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.35
BayesDel_addAF	Benign	-0.017	T
BayesDel_noAF	Benign	-0.26
CADD	Benign	18
DANN	Benign	0.93
DEOGEN2	Benign	0.23	T
Eigen	Benign	0.18
Eigen_PC	Benign	0.13
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Benign	0.55	T
M_CAP	Pathogenic	0.30	D
MetaRNN	Pathogenic	0.76	D
MetaSVM	Benign	-0.73	T
MutationAssessor	Uncertain	2.4	M
PhyloP100		2.1
PrimateAI	Benign	0.29	T
PROVEAN	Uncertain	-3.3	D
REVEL	Uncertain	0.34
Sift	Benign	0.15	T
Sift4G	Uncertain	0.016	D
Polyphen		0.94	P
Vest4		0.53
MutPred		0.61		Gain of glycosylation at H4603 (P = 0.0903)
MVP		0.94
MPC		0.21
ClinPred		0.78	D
GERP RS		2.7
Varity_R		0.86
gMVP		0.69
Mutation Taster		=11/89	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs727504551; hg19: chr1-215847445;