Rhabdomyolysis and Metabolic Myopathy

Gene: PNPLA2

Green List (high evidence)

Neutral lipid storage disease with myopathy is an autosomal recessive muscle disorder characterized by adult onset of slowly progressive proximal muscle weakness affecting the upper and lower limbs and associated with increased serum creatine kinase; distal muscle weakness may also occur. About half of patients develop cardiomyopathy later in the disease course. Other variable features include diabetes mellitus, hepatic steatosis, hypertriglyceridemia, and possibly sensorineural hearing loss. Leukocytes and muscle cells show cytoplasmic accumulation of triglycerides.

Created: 7 Feb 2021, 3:08 a.m. | Last Modified: 7 Feb 2021, 3:08 a.m.

Panel Version: 0.82

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Red List (low evidence)

PMID: 32269696 - 1 patient with both upper and lower limb weakness. She had elevated CK levels, with onset >25 years old.

PMID: 21544567 - 6 patients with distal muscle weakness, shoulder girdle weakness and elevated CK levels. Severe dystrophic features of the shoulder girdle noted in 3/3 patients analysed by whole body MRI. Proximal muscle weakness was generalised first, with lower limbs affected in the 3rd/4th decade of life. Earliest age of onset 29 years old, 5/6 patients had homozygous PTCs.

Summary: no paediatric onset.
Sources: Expert list

Created: 22 Jun 2020, 1:15 a.m.

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
Neutral lipid storage disease with myopathy 610717

Publications

• PMID: 32269696
• 21544567

Green List (high evidence)

Three unrelated families reported with exercise intolerance as a presenting feature of the condition.
Sources: Expert list

Created: 29 May 2020, 3:03 a.m.

Mode of inheritance
BIALLELIC, autosomal or pseudoautosomal

Phenotypes
Neutral lipid storage disease with myopathy MIM#610717

Publications

• 18952067
• 25287355
• 25956450