NM_174878.3:c.188_210delACGGGCTTTTCCACGGAGAGGGT

Variant names:

• chr3-150972498-CACCCTCTCCGTGGAAAAGCCCGT-C
• rs1553776036
• NM_174878.3:c.188_210delACGGGCTTTTCCACGGAGAGGGT

Variant summary

Our verdict is Likely pathogenic. The variant received 9 ACMG points: 9P and 0B. PVS1 PP5

The NM_174878.3(CLRN1):​c.188_210delACGGGCTTTTCCACGGAGAGGGT​(p.Tyr63CysfsTer59) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Pathogenic (no stars). Synonymous variant affecting the same amino acid position (i.e. Y63Y) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CLRN1 NM_174878.3 frameshift
• Clinical Significance: Pathogenic no assertion criteria provided P:2
• Conservation: PhyloP100: 7.42
• Publications: 1 publications found

Genes affected

CLRN1 (HGNC:12605): (clarin 1) This gene encodes a protein that contains a cytosolic N-terminus, multiple helical transmembrane domains, and an endoplasmic reticulum membrane retention signal, TKGH, in the C-terminus. The encoded protein may be important in development and homeostasis of the inner ear and retina. Mutations within this gene have been associated with Usher syndrome type IIIa. Multiple transcript variants encoding distinct isoforms have been identified for this gene. [provided by RefSeq, Jul 2008]

ENSG00000243273 (HGNC:):

SIAH2-AS1 (HGNC:40526): (SIAH2 antisense RNA 1)

CLRN1-AS1 (HGNC:30895): (CLRN1 antisense RNA 1)

ACMG classification

Our verdict: Likely_pathogenic. The variant received 9 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PP5: Variant 3-150972498-CACCCTCTCCGTGGAAAAGCCCGT-C is Pathogenic according to our data. Variant chr3-150972498-CACCCTCTCCGTGGAAAAGCCCGT-C is described in ClinVar as Pathogenic. ClinVar VariationId is 4398.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CLRN1	NM_174878.3	c.188_210delACGGGCTTTTCCACGGAGAGGGT	p.Tyr63CysfsTer59	frameshift_variant	Exon 1 of 3	ENST00000327047.6	NP_777367.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CLRN1	ENST00000327047.6	c.188_210delACGGGCTTTTCCACGGAGAGGGT	p.Tyr63CysfsTer59	frameshift_variant	Exon 1 of 3	1	NM_174878.3	ENSP00000322280.1

Frequencies

GnomAD3 genomes Cov.: 32

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

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: no assertion criteria provided

Submissions by phenotype

Usher syndrome type 3 Pathogenic:2

May 15, 2025

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jun 01, 2002

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		7.4
Mutation Taster		=2/198	disease causing (ClinVar)

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1553776036; hg19: chr3-150690285;