chr19-38469111-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got -1 ACMG points: 0P and 1B. BP4

This summary comes from the ClinGen Evidence Repository: This pathogenicity assessment is relevant only for malignant hyperthermia susceptibility (MHS) inherited in an autosomal dominant pattern. Variants in RYR1 can also cause other myopathies inherited in an autosomal dominant pattern or in an autosomal recessive pattern. Some of these disorders may predispose individuals to malignant hyperthermia. RYR1 variants may also contribute to a malignant hyperthermia reaction in combination with other genetic and non-genetic factors and the clinician needs to consider such factors in making management decisions.This sequence variant predicts a substitution of tyrosine with isoleucine at codon 1176 of the RYR1 protein, p.(Tyr1176Ile). The maximum allele frequency for this variant among the six major gnomAD populations is SAS: 0.0005879, a frequency consistent with pathogenicity for MHS. This variant has been reported in an individual with a personal or family history of an MH episode and a positive in vitro contracture test (IVCT) or caffeine halothane contracture test (CHCT) result (if the proband was unavailable for testing, a positive diagnostic test result in a mutation-positive relative was counted) (PMID:30236257). However, the high MAF in the SAS population in gnomAD precludes the use of PS4. No functional studies were identified for this variant. This variant does not reside in a hotspot for pathogenic variants that contribute to MHS. A REVEL score <0.5 (0.162) supports a benign status for this variant, BP4. This variant has been classified as a Variant of Uncertain Significance. Criteria implemented: BP4. LINK:https://erepo.genome.network/evrepo/ui/classification/CA064960/MONDO:0018493/012

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000036 ( 0 hom. )

Consequence

RYR1
NM_000540.3 missense

Scores

Clinical Significance

Uncertain significance reviewed by expert panel U:3B:1

Conservation

PhyloP100: 4.81

Variant links:

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]

RYR1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got -1 ACMG points.

BP4

For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RYR1	NM_000540.3 link	c.3527C>T	p.Thr1176Ile	missense_variant	Exon 26 of 106	ENST00000359596.8	NP_000531.2	P21817-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
RYR1	ENST00000359596.8 link	c.3527C>T	p.Thr1176Ile	missense_variant	Exon 26 of 106	5	NM_000540.3	ENSP00000352608.2	P21817-1
RYR1	ENST00000355481.8 link	c.3527C>T	p.Thr1176Ile	missense_variant	Exon 26 of 105	1		ENSP00000347667.3	P21817-2
RYR1	ENST00000599547.6 link	n.3527C>T		non_coding_transcript_exon_variant	Exon 26 of 80	2		ENSP00000471601.2	M0R127

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152206

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000622

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000756

AC:

AN:

251478

Hom.:

AF XY:

0.0000883

AC XY:

AN XY:

135914

show subpopulations

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:

0.000588

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000363

AC:

AN:

1461892

Hom.:

Cov.:

AF XY:

0.0000495

AC XY:

AN XY:

727248

show subpopulations

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:

0.000499

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000540

Gnomad4 OTH exome

AF:

0.0000662

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152324

Hom.:

Cov.:

AF XY:

0.0000403

AC XY:

AN XY:

74480

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000622

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ExAC

AF:

0.0000906

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3Benign:1

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 06, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: RYR1 c.3527C>T (p.Thr1176Ile) results in a non-conservative amino acid change located in the B30.2/SPRY domain (IPR001870) of the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 7.6e-05 in 251478 control chromosomes. This frequency is not significantly higher than estimated for a pathogenic variant in RYR1 causing Malignant Hyperthermia Susceptibility (7.6e-05 vs 8.8e-05), allowing no conclusion about variant significance. c.3527C>T has been reported in the literature in at least one family affected with Malignant Hyperthermia Susceptibility (e.g. Miller_BJA_2018). This report does not provide unequivocal conclusions about association of the variant with Malignant Hyperthermia Susceptibility. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 35849058, 30236257). ClinVar contains an entry for this variant (Variation ID: 590517). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Malignant hyperthermia of anesthesia

Uncertain:1

Apr 06, 2023

ClinGen Malignant Hyperthermia Susceptibility Variant Curation Expert Panel, ClinGen

Significance: Uncertain significance

Review Status: reviewed by expert panel

Collection Method: curation

This pathogenicity assessment is relevant only for malignant hyperthermia susceptibility (MHS) inherited in an autosomal dominant pattern. Variants in RYR1 can also cause other myopathies inherited in an autosomal dominant pattern or in an autosomal recessive pattern. Some of these disorders may predispose individuals to malignant hyperthermia. RYR1 variants may also contribute to a malignant hyperthermia reaction in combination with other genetic and non-genetic factors and the clinician needs to consider such factors in making management decisions. This sequence variant predicts a substitution of tyrosine with isoleucine at codon 1176 of the RYR1 protein, p.(Tyr1176Ile). The maximum allele frequency for this variant among the six major gnomAD populations is SAS: 0.0005879, a frequency consistent with pathogenicity for MHS. This variant has been reported in an individual with a personal or family history of an MH episode and a positive in vitro contracture test (IVCT) or caffeine halothane contracture test (CHCT) result (if the proband was unavailable for testing, a positive diagnostic test result in a mutation-positive relative was counted) (PMID:30236257). However, the high MAF in the SAS population in gnomAD precludes the use of PS4. No functional studies were identified for this variant. This variant does not reside in a hotspot for pathogenic variants that contribute to MHS. A REVEL score <0.5 (0.162) supports a benign status for this variant, BP4. This variant has been classified as a Variant of Uncertain Significance. Criteria implemented: BP4. -

not provided

Uncertain:1

Jul 18, 2016

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

RYR1-related disorder

Benign:1

Dec 17, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.20

BayesDel_addAF

Benign

-0.28

BayesDel_noAF

Benign

-0.28

CADD

Benign

DANN

Benign

0.92

DEOGEN2

Benign

0.29

.;T

Eigen

Benign

-0.031

Eigen_PC

Benign

0.062

FATHMM_MKL

Benign

0.49

LIST_S2

Uncertain

0.89

D;D

M_CAP

Uncertain

0.17

MetaRNN

Benign

0.081

T;T

MetaSVM

Benign

-0.68

MutationAssessor

Benign

0.78

N;N

PrimateAI

Uncertain

0.51

PROVEAN

Benign

0.47

N;N

REVEL

Benign

0.16

Sift

Benign

0.15

T;T

Polyphen

0.43

B;B

Vest4

0.55

MutPred

0.37

Loss of phosphorylation at T1176 (P = 0.0308);Loss of phosphorylation at T1176 (P = 0.0308);

MVP

0.85

MPC

0.43

ClinPred

0.052

GERP RS

3.7

Varity_R

0.11

gMVP

0.54

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.070

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over