1-201074573-C-A

Variant names:

• chr1-201074573-C-A
• rs377082783
• NM_000069.3:c.1996G>T

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_000069.3(CACNA1S):​c.1996G>T​(p.Glu666*) variant causes a stop gained change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. E666E) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 34)
• Consequence: CACNA1S NM_000069.3 stop_gained
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.88
• 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):

• hypokalemic periodic paralysis, type 1

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

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: ClinGen, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• congenital myopathy 18

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

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

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• 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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CACNA1S	NM_000069.3	MANE Select	c.1996G>T	p.Glu666*	stop_gained	Exon 14 of 44	NP_000060.2	Q13698

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CACNA1S	ENST00000362061.4	TSL:1 MANE Select	c.1996G>T	p.Glu666*	stop_gained	Exon 14 of 44	ENSP00000355192.3	Q13698
	CACNA1S	ENST00000367338.7	TSL:5	c.1996G>T	p.Glu666*	stop_gained	Exon 14 of 43	ENSP00000356307.3	B1ALM3
	CACNA1S	ENST00000681874.1		c.1996G>T	p.Glu666*	stop_gained	Exon 14 of 43	ENSP00000505162.1	A0A7P0T8M7

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 34

Alfa AF: 0.000106 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.65
CADD	Pathogenic	47
DANN	Uncertain	1.0
Eigen	Pathogenic	0.96
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Pathogenic	0.98	D
PhyloP100		7.9
Vest4		0.92
GERP RS		4.0
Mutation Taster		=3/197	disease causing (fs/PTC)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.22		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.22		Position offset: -3

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

Other links and lift over

dbSNP: rs377082783; hg19: chr1-201043701;