rs774319202

Positions:

• chr19-38469433-ATGCAGCGCCCAGTC-A

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PVS1 PP5

The NM_000540.3(RYR1):​c.3686_3699del​(p.Met1229AsnfsTer12) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000171 in 1,461,888 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.000017 (0 hom.)
• Consequence: RYR1 NM_000540.3 frameshift
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2 U:1
• Conservation: PhyloP100: 9.88

Genes affected

RYR1 (HGNC:10483): (ryanodine receptor 1) This gene encodes a ryanodine receptor found in skeletal muscle. The encoded protein functions as a calcium release channel in the sarcoplasmic reticulum but also serves to connect the sarcoplasmic reticulum and transverse tubule. Mutations in this gene are associated with malignant hyperthermia susceptibility, central core disease, and minicore myopathy with external ophthalmoplegia. Alternatively spliced transcripts encoding different isoforms have been described. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PP5: Variant 19-38469433-ATGCAGCGCCCAGTC-A is Pathogenic according to our data. Variant chr19-38469433-ATGCAGCGCCCAGTC-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 544373.We mark this variant Likely_pathogenic, oryginal submissions are: {Pathogenic=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RYR1	NM_000540.3	c.3686_3699del	p.Met1229AsnfsTer12	frameshift_variant	27/106	ENST00000359596.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RYR1	ENST00000359596.8	c.3686_3699del	p.Met1229AsnfsTer12	frameshift_variant	27/106	5	NM_000540.3	A2
RYR1	ENST00000355481.8	c.3686_3699del	p.Met1229AsnfsTer12	frameshift_variant	27/105	1		P4
RYR1	ENST00000599547.6	c.3686_3699del	p.Met1229AsnfsTer12	frameshift_variant, NMD_transcript_variant	27/80	2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.00000796 AC: 2 AN: 251354 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135860

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000171 AC: 25 AN: 1461888 Hom.: 0 AF XY: 0.00000825 AC XY: 6 AN XY: 727242

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: 0.0000187

Gnomad4 NFE exome AF: 0.0000216

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000756

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Malignant hyperthermia, susceptibility to, 1 Pathogenic:1 Uncertain:1

Likely pathogenic, no assertion criteria provided	research	deCODE genetics, Amgen	Jul 21, 2023	The variant NM_000540.3:c.3686_3699del (chr19:38469433) in RYR1 was detected in 1 heterozygote out of 58K WGS Icelanders (MAF= 0,001%). This variant has been reported in ClinVar previously as pathogenic. Based on ACMG criteria (PVS1, PM2) this variant classifies as likely pathogenic. -
Uncertain significance, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Jul 10, 2023	This variant deletes 14 nucleotides in exon 27 of the RYR1 gene, creating a frameshift and premature translation stop signal. This variant is expected to result in an absent or non-functional protein product. This variant has not been reported in individuals affected with autosomal dominant malignant hyperthermia susceptibility in the literature, although it is associated with other phenotype(s) (ClinVar variation ID: 544373). This variant has been identified in 2/251354 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of RYR1 function due to truncation variants is not an established disease mechanism for autosomal dominant malignant hyperthermia susceptibility. Due to insufficient evidence, this variant is classified as a Variant of Uncertain Significance for malignant hyperthermia susceptibility. -

RYR1-related disorder Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 23, 2023

ClinVar contains an entry for this variant (Variation ID: 544373). For these reasons, this variant has been classified as Pathogenic. This variant has not been reported in the literature in individuals affected with RYR1-related conditions. This variant is present in population databases (rs774319202, gnomAD 0.002%). This sequence change creates a premature translational stop signal (p.Met1229Asnfs*12) in the RYR1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in RYR1 are known to be pathogenic (PMID: 23919265, 25960145, 28818389, 30611313). -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs774319202; hg19: chr19-38960073;