rs80338779

Variant names:

• chr1-201066283-C-A
• rs80338779
• NM_000069.3:c.2691G>T

Your query was ambiguous. Multiple possible variants found:

• chr1-201066283-C-A
• chr1-201066283-C-G

Variant summary

Our verdict is Pathogenic. The variant received 15 ACMG points: 15P and 0B. PS1 PM1 PM2 PM5 PP3_Strong PP5

The NM_000069.3(CACNA1S):​c.2691G>T​(p.Arg897Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Pathogenic in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R897G) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: CACNA1S NM_000069.3 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2 U:1 O:1
• Conservation: PhyloP100: 1.28
• Publications: 18 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 15 ACMG points.

• PS1: Transcript NM_000069.3 (CACNA1S) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar.
• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 8 uncertain in NM_000069.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr1-201066285-T-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 806315.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.983
• PP5: Variant 1-201066283-C-A is Pathogenic according to our data. Variant chr1-201066283-C-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 17630.

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.2691G>T	p.Arg897Ser	missense	Exon 21 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.2691G>T	p.Arg897Ser	missense	Exon 21 of 44	ENSP00000355192.3	Q13698
	CACNA1S	ENST00000367338.7	TSL:5	c.2691G>T	p.Arg897Ser	missense	Exon 21 of 43	ENSP00000356307.3	B1ALM3
	CACNA1S	ENST00000681874.1		c.2631G>T	p.Arg877Ser	missense	Exon 20 of 43	ENSP00000505162.1	A0A7P0T8M7

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1461028 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 726886

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44718

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26130

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

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52600

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111988

Other (OTH) AF: 0.00 AC: 0 AN: 60388

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
1	-	-	Hypokalemic periodic paralysis, type 1 (2)
1	-	-	Malignant hyperthermia, susceptibility to, 5;C3714580:Hypokalemic periodic paralysis, type 1 (1)
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.95
BayesDel_addAF	Pathogenic	0.51	D
BayesDel_noAF	Pathogenic	0.50
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.86	D
Eigen	Uncertain	0.41
Eigen_PC	Benign	0.22
FATHMM_MKL	Uncertain	0.84	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.35	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.9	H
PhyloP100		1.3
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-5.5	D
REVEL	Pathogenic	0.90
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.88	P
Vest4		0.96
MutPred		0.90		Loss of MoRF binding (P = 0.0278)
MVP		0.96
MPC		0.50
ClinPred		1.0	D
GERP RS		0.68
Varity_R		0.93
gMVP		0.97
Mutation Taster		=1/99	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
Splicevardb		2.0
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

Other links and lift over

dbSNP: rs80338779; hg19: chr1-201035411;