Genetic Variant RYR3:p.Cys64Ser (chr15-33503650-G-C) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001036.6(RYR3):c.191G>C(p.Cys64Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,457,984 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C64Y) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

RYR3
NM_001036.6 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 5.63

Publications

0 publications found

Variant links:

Genes affected

RYR3 (HGNC:10485): (ryanodine receptor 3) The protein encoded by this gene is a ryanodine receptor, which functions to release calcium from intracellular storage for use in many cellular processes. For example, the encoded protein is involved in skeletal muscle contraction by releasing calcium from the sarcoplasmic reticulum followed by depolarization of T-tubules. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2011]

RYR3 Gene-Disease associations (from GenCC):

genetic developmental and epileptic encephalopathy
Inheritance: AD Classification: LIMITED Submitted by: ClinGen, G2P
congenital myopathy
Inheritance: AR Classification: NO_KNOWN Submitted by: ClinGen

RYR3 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RYR3	NM_001036.6 link	c.191G>C	p.Cys64Ser	missense_variant	Exon 3 of 104	ENST00000634891.2	NP_001027.3	Q15413-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RYR3	ENST00000634891.2 link	c.191G>C	p.Cys64Ser	missense_variant	Exon 3 of 104	1	NM_001036.6	ENSP00000489262.1		Q15413-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1457984

Hom.:

Cov.:

AF XY:

0.00000276

AC XY:

AN XY:

725184

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33396

American (AMR)

AF:

0.00

AC:

AN:

44618

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26074

East Asian (EAS)

AF:

0.00

AC:

AN:

39672

South Asian (SAS)

AF:

0.00

AC:

AN:

85594

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53328

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.00000180

AC:

AN:

1109260

Other (OTH)

AF:

0.00

AC:

AN:

60280

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.325

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.23

BayesDel_addAF

Uncertain

0.11

BayesDel_noAF

Benign

-0.090

CADD

Uncertain

(source)

DANN

Benign

0.77

DEOGEN2

Uncertain

0.66

D;.;.;.;.

Eigen

Benign

-0.023

Eigen_PC

Benign

0.19

FATHMM_MKL

Uncertain

0.97

LIST_S2

Benign

0.84

T;T;T;T;T

M_CAP

Benign

0.068

MetaRNN

Uncertain

0.48

T;T;T;T;T

MetaSVM

Uncertain

0.53

MutationAssessor

Benign

0.035

N;N;.;.;.

PhyloP100

5.6

PrimateAI

Uncertain

0.67

PROVEAN

Benign

-2.0

.;N;N;.;.

REVEL

Uncertain

0.53

Sift

Benign

0.85

.;T;T;.;.

Polyphen

0.96

D;B;.;.;.

Vest4

0.46

MutPred

0.58

Gain of disorder (P = 0.0675);Gain of disorder (P = 0.0675);Gain of disorder (P = 0.0675);Gain of disorder (P = 0.0675);Gain of disorder (P = 0.0675);

MVP

0.43

MPC

0.23

ClinPred

0.70

GERP RS

5.4

Varity_R

0.33

gMVP

0.51

Mutation Taster

=50/50

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over