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Hypokalemic periodic paralysis, type 1

CACNA1S · rs563795648

Where this position leads

Drug: Volatile anaesthetics and succinylcholine

rs563795648 Drug: Volatile anaesthetics and succinylcholine Volatile anaesthetics and succinylcholine Drug rs563795648 rs563795648 CACNA1S

Strength of the evidence

There is no record yet to score this position by (a ClinVar disease classification or a genome-wide significant study). That is not the same as weak evidence.

How this is scored

4: ClinVar disease-causing, reviewed by an expert panel or a guideline (3–4 stars). 3: ClinVar, several labs agreeing (2 stars), or a genetic study at p ≤ 10−50. 2: ClinVar from one lab (1 star), or p ≤ 10−20. 1: ClinVar submitted without criteria (0 stars), or genome-wide significance (p ≤ 5×10−8). The higher of the two counts. It says how solid the evidence is, not whether it matters for a particular person.

What ClinVar records

Classification Uncertain significance for Hypokalemic periodic paralysis, type 1, Malignant hyperthermia, susceptibility to, 5, Thyrotoxic periodic paralysis, susceptibility to, 1, Congenital myopathy 18; criteria provided, multiple submitters, no conflicts (2 of 4 stars, 5 submitters), last evaluated 2025-03-05. ClinVar record 1043053 NM_000069.3(CACNA1S):c.4025C>T (p.Ser1342Leu)

Classification Pathogenic for Hypokalemic periodic paralysis, type 1, Malignant hyperthermia, susceptibility to, 5; criteria provided, single submitter (1 of 4 stars, 1 submitter), last evaluated 2018-10-31. ClinVar record 641633 NM_000069.3(CACNA1S):c.4025C>A (p.Ser1342Ter)

Change history MyGeneLog™ keeps a copy of every weekly release from 2026-10-19 and compares them. This position's classification has not changed since.

What this is ClinVar's aggregate record for this position (as of its 2026-10-19 release), not a result about you. A classification describes the variant against the condition named, as laboratories submitted it. Whether a person carries this variant, and what that would mean for them, is a question for a clinical test and a genetic counsellor.

What each result means

G/G No copy of the version ClinVar lists as disease-causing for Hypokalemic periodic paralysis, type 1. This is the usual result. So far only one lab has made this call, so it may change. (ClinVar VCV000641633, criteria provided, single submitter)
G/T One copy of the version ClinVar lists as disease-causing for Hypokalemic periodic paralysis, type 1. Some conditions need only one copy; for others, one copy makes a person a carrier who is usually healthy but can pass it on. A genetic counsellor can say which applies. So far only one lab has made this call, so it may change. (ClinVar VCV000641633, criteria provided, single submitter)
T/T Two copies of the version ClinVar lists as disease-causing for Hypokalemic periodic paralysis, type 1. A result like this should be confirmed by a medical genetic test and talked through with a doctor; consumer DNA files can misread rare variants. So far only one lab has made this call, so it may change. (ClinVar VCV000641633, criteria provided, single submitter)

Source: ClinVar VCV000641633, criteria provided, single submitter

Questions about rs563795648

What is rs563795648?

rs563795648 is a single position in the genome, in or near the CACNA1S gene. Published research associates it with hypokalemic periodic paralysis, type 1. A single variant does not decide an outcome — it shifts a probability, and for most common variants the shift is small.

Does rs563795648 affect how medicines work?

CACNA1S carries pharmacogenomic findings for Volatile anaesthetics and succinylcholine. That is educational information, not a prescription or a dosing guide. Any decision to start, stop or change a medicine belongs with the clinician or pharmacist managing your treatment.

Does having rs563795648 mean I will get this?

No. Common variants like this one move a probability slightly and, on their own, rarely decide anything about one person. Nothing on this page is a diagnosis, and health decisions should be made with a clinician who can see your whole picture.

Where does the information about rs563795648 come from?

ClinVar VCV000641633, criteria provided, single submitter. Every variant on MyGeneLog comes from public primary sources and is published with its citation and the date it was checked.

Quoting this page

Licensed CC BY-NC 4.0: free to read, share and adapt for non-commercial use, naming MyGeneLog™ and linking the exact page. Commercial use, including training or serving a commercial AI system, needs a licence — https://www.mygenelog.com/license

Hypokalemic periodic paralysis, type 1 (rs563795648). MyGeneLog™. https://www.mygenelog.com/variants/rs563795648

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