rs727504301

chr10-54090054-G-Achr10-54090054-G-C

Variant summary

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

The NM_033056.4(PCDH15):c.1927C>T(p.Arg643Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000617 in 1,458,212 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. R643R) has been classified as Benign. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000062 (0 hom.)
• Consequence: PCDH15 NM_033056.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 2.66

Genes affected

PCDH15 (HGNC:14674): (protocadherin related 15) This gene is a member of the cadherin superfamily. Family members encode integral membrane proteins that mediate calcium-dependent cell-cell adhesion. It plays an essential role in maintenance of normal retinal and cochlear function. Mutations in this gene result in hearing loss and Usher Syndrome Type IF (USH1F). Extensive alternative splicing resulting in multiple isoforms has been observed in the mouse ortholog. Similar alternatively spliced transcripts are inferred to occur in human, and additional variants are likely to occur. [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 10-54090054-G-A is Pathogenic according to our data. Variant chr10-54090054-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 177724.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr10-54090054-G-A is described in Lovd as [Pathogenic]. Variant chr10-54090054-G-A is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PCDH15	NM_033056.4	c.1927C>T	p.Arg643Ter	stop_gained	16/33	ENST00000320301.11
PCDH15	NM_001384140.1	c.1927C>T	p.Arg643Ter	stop_gained	16/38	ENST00000644397.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PCDH15	ENST00000320301.11	c.1927C>T	p.Arg643Ter	stop_gained	16/33	1	NM_033056.4
PCDH15	ENST00000644397.2	c.1927C>T	p.Arg643Ter	stop_gained	16/38		NM_001384140.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000617 AC: 9 AN: 1458212 Hom.: 0 Cov.: 29 AF XY: 0.00000551 AC XY: 4 AN XY: 725706

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: 0.0000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000631

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Usher syndrome type 1F Pathogenic:2

Pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Mar 31, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Sep 07, 2018	Variant summary: PCDH15 c.1927C>T (p.Arg643X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. A truncation downstream of this position have been classified as pathogenic by our laboratory (c.2971C>T (p.Arg991X)). The variant was absent in 246434 control chromosomes (gnomAD and publication data). c.1927C>T has been reported in the literature as a homozygous and compound heterozygous allele in multiple individuals affected with Usher Syndrome Type 1F (Ahmed 2003, Roux 2006). These data indicate that the variant is very likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as pathogenic. -

Usher syndrome type 1D;C1836027:Autosomal recessive nonsyndromic hearing loss 23;C1865885:Usher syndrome type 1F Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Apr 27, 2022

- -

Usher syndrome type 1D Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Centre for Genomic Medicine, Manchester, Central Manchester University Hospitals

Feb 01, 2019

- -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Oct 23, 2023

This sequence change creates a premature translational stop signal (p.Arg643*) in the PCDH15 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in PCDH15 are known to be pathogenic (PMID: 11398101, 11487575, 14570705). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with Usher syndrome (PMID: 14570705). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 177724). For these reasons, this variant has been classified as Pathogenic. -

Rare genetic deafness Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Feb 10, 2014

The Arg643X variant in PCDH15 has been reported in two individuals with Usher sy ndrome (Ahmed 2003, Roux 2006), and was not identified in large population studi es. Both of these individuals were homozygous or compound heterozygous with a se cond pathogenic variant and this variant segregated in two affected siblings. Th is nonsense variant leads to a premature termination codon at position 643, whic h is predicted to lead to a truncated or absent protein. In summary, this varian t meets our criteria to be classified as pathogenic (http://pcpgm.partners.org/L MM). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.60
Cadd	Pathogenic	40
Dann	Uncertain	1.0
Eigen	Pathogenic	0.75
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Uncertain	0.86	D
MutationTaster	Benign	1.0	A;A;A;A;A;A;A;A;A;A;A;A;A;D;D;D
Vest4		0.89
GERP RS		5.2

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.30		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.30		Position offset: 9

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

Publications

LitVar

Other links and lift over

dbSNP: rs727504301; hg19: chr10-55849814; COSMIC: COSV57344560;