rs777977731

Variant names:

• chr1-201040334-C-A
• rs777977731
• NM_000069.3:c.5267G>T

Your query was ambiguous. Multiple possible variants found:

• chr1-201040334-C-A
• chr1-201040334-C-G
• chr1-201040334-C-T

Variant summary

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

The NM_000069.3(CACNA1S):​c.5267G>T​(p.Ser1756Ile) 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 1,461,550 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/24 in silico tools predict a benign outcome for this variant. 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. S1756N) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CACNA1S NM_000069.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.15
• Publications: 0 publications found

Genes affected

CACNA1S (HGNC:1397): (calcium voltage-gated channel subunit alpha1 S) This gene encodes one of the five subunits of the slowly inactivating L-type voltage-dependent calcium channel in skeletal muscle cells. Mutations in this gene have been associated with hypokalemic periodic paralysis, thyrotoxic periodic paralysis and malignant hyperthermia susceptibility. [provided by RefSeq, Jul 2008]

CACNA1S Gene-Disease associations (from GenCC):

• congenital myopathy 18

  Inheritance: AD, AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• hypokalemic periodic paralysis, type 1

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Ambry Genetics
• malignant hyperthermia, susceptibility to, 5

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), Ambry Genetics
• congenital myopathy

  Inheritance: SD, AR, AD Classification: STRONG Submitted by: Illumina, Genomics England PanelApp
• hypokalemic periodic paralysis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000234132 (HGNC:):

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000069.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CACNA1S	NM_000069.3	MANE Select	c.5267G>T	p.Ser1756Ile	missense	Exon 43 of 44	NP_000060.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CACNA1S	ENST00000362061.4	TSL:1 MANE Select	c.5267G>T	p.Ser1756Ile	missense	Exon 43 of 44	ENSP00000355192.3
	CACNA1S	ENST00000367338.7	TSL:5	c.5210G>T	p.Ser1737Ile	missense	Exon 42 of 43	ENSP00000356307.3
	CACNA1S	ENST00000681874.1		c.5207G>T	p.Ser1736Ile	missense	Exon 42 of 43	ENSP00000505162.1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461550 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 727052

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

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44686

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26128

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86216

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53286

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5762

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111908

Other (OTH) AF: 0.00 AC: 0 AN: 60386

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 34

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.090
BayesDel_addAF	Benign	-0.036	T
BayesDel_noAF	Benign	-0.29
CADD	Benign	12
DANN	Benign	0.72
DEOGEN2	Benign	0.025	T
Eigen	Benign	-1.3
Eigen_PC	Benign	-1.4
FATHMM_MKL	Benign	0.0061	N
LIST_S2	Benign	0.56	T
M_CAP	Benign	0.055	D
MetaRNN	Benign	0.078	T
MetaSVM	Uncertain	-0.25	T
MutationAssessor	Benign	0.69	N
PhyloP100		-1.2
PrimateAI	Benign	0.26	T
PROVEAN	Benign	-1.8	N
REVEL	Benign	0.21
Sift	Benign	0.24	T
Sift4G	Benign	0.39	T
Polyphen		0.0050	B
Vest4		0.13
MutPred		0.25		Loss of phosphorylation at S1756 (P = 0.0016)
MVP		0.74
MPC		0.14
ClinPred		0.12	T
GERP RS		-2.6
Varity_R		0.058
gMVP		0.29
Mutation Taster		=97/3	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.27		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.27		Position offset: -12

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

Other links and lift over

dbSNP: rs777977731; hg19: chr1-201009462; COSMIC: COSV62940195; COSMIC: COSV62940195;