What is SMA?
Autosomal recessive disease with loss of spinal motor neurons.
Symptoms
Progressive muscle weakness, respiratory and feeding difficulties, motor milestone delay.
Genetic causes
Deletion or mutation of the SMN1 gene.
Inheritance pattern
Autosomal recessive.
Important genes
SMN1, SMN2 (disease modifier).
Who should be tested?
Couples before pregnancy and affected families.
Recommended tests
MLPA for SMN1, carrier screening.
Counseling
PGT-M and specialized prenatal testing are options for carrier couples.