rs750304434

Positions:

• chr19-38452954-C-G
• chr19-38452954-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_000540.3(RYR1):​c.1380C>G​(p.His460Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,648 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: RYR1 NM_000540.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: -0.596

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 Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), RYR1. . Gene score misZ 1.918 (greater than the threshold 3.09). Trascript score misZ 3.9788 (greater than threshold 3.09). GenCC has associacion of gene with King-Denborough syndrome, congenital multicore myopathy with external ophthalmoplegia, autosomal recessive centronuclear myopathy, RYR1-related myopathy, lethal multiple pterygium syndrome, malignant hyperthermia of anesthesia, benign Samaritan congenital myopathy, malignant hyperthermia, susceptibility to, 1, congenital myopathy with myasthenic-like onset, central core myopathy.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RYR1	NM_000540.3	c.1380C>G	p.His460Gln	missense_variant	13/106	ENST00000359596.8	NP_000531.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RYR1	ENST00000359596.8	c.1380C>G	p.His460Gln	missense_variant	13/106	5	NM_000540.3	ENSP00000352608	A2
RYR1	ENST00000355481.8	c.1380C>G	p.His460Gln	missense_variant	13/105	1		ENSP00000347667	P4
RYR1	ENST00000599547.6	c.1380C>G	p.His460Gln	missense_variant, NMD_transcript_variant	13/80	2		ENSP00000471601

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000400 AC: 1 AN: 249898 Hom.: 0 AF XY: 0.00000738 AC XY: 1 AN XY: 135448

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000546

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461648 Hom.: 0 Cov.: 33 AF XY: 0.00000138 AC XY: 1 AN XY: 727148

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	Nov 02, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Jun 12, 2019	- -

RYR1-related disorder Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 22, 2022

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). ClinVar contains an entry for this variant (Variation ID: 590438). This variant has not been reported in the literature in individuals affected with RYR1-related conditions. This variant is present in population databases (no rsID available, gnomAD 0.006%). This sequence change replaces histidine, which is basic and polar, with glutamine, which is neutral and polar, at codon 460 of the RYR1 protein (p.His460Gln). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.94
BayesDel_addAF	Benign	-0.0063	T
BayesDel_noAF	Uncertain	-0.080
CADD	Benign	14
DANN	Benign	0.96
DEOGEN2	Pathogenic	0.90	.;D
Eigen	Benign	-0.013
Eigen_PC	Benign	-0.18
FATHMM_MKL	Benign	0.39	N
LIST_S2	Benign	0.81	T;T
M_CAP	Pathogenic	0.67	D
MetaRNN	Uncertain	0.59	D;D
MetaSVM	Pathogenic	0.83	D
MutationAssessor	Benign	1.7	L;L
MutationTaster	Benign	0.93	D;D;D
PrimateAI	Uncertain	0.68	T
PROVEAN	Pathogenic	-6.8	D;D
REVEL	Uncertain	0.62
Sift	Uncertain	0.0030	D;D
Polyphen		1.0	D;D
Vest4		0.38
MutPred		0.64		Gain of helix (P = 0.2059);Gain of helix (P = 0.2059);
MVP		1.0
MPC		0.98
ClinPred		0.88	D
GERP RS		-0.098
Varity_R		0.79
gMVP		0.67

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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

Other links and lift over

dbSNP: rs750304434; hg19: chr19-38943594;