Familial hypomagnesaemia with secondary hypocalcaemia

Area of Science:

• Biochemistry
• Genetics
• Pediatrics

Background:

• Magnesium is vital for neuronal, skeletal, and cardiac function.
• Hypomagnesaemia can lead to hypocalcaemia, seizures, and arrhythmias.
• Primary hypomagnesaemia with secondary hypocalcaemia (HSH) is a rare intestinal absorption disorder.

Observation:

• HSH typically presents neonatally with refractory seizures and neuromuscular excitability.
• Fewer than 100 cases of HSH have been reported globally.
• This study details the presentation and long-term follow-up of a female patient with HSH.

Findings:

• The patient was diagnosed with a mutation in the transient receptor potential melastatin 6 (TRPM6) gene.
• TRPM6 encodes a transient receptor potential cation channel implicated in magnesium transport.
• Genetic analysis identified the specific mutation responsible for the HSH phenotype.

Implications:

• Early diagnosis and prompt magnesium therapy are critical for preventing mortality and neurodevelopmental deficits.
• Understanding the genetic basis of HSH aids in accurate diagnosis and genetic counseling.
• Advances in genetic understanding of HSH pave the way for targeted therapeutic strategies.