Title: Homozygosity for the common GAA gene splice site mutation c.-32-13T>G in Pompe disease is associated with the classical adult phenotypical spectrum
Authors: Musumeci, Olimpia ×
Thieme, Andrea
Claeys, Kristl
Wenninger, Stephan
Kley, Rudolf A
Kuhn, Marius
Lukacs, Zoltan
Deschauer, Marcus
Gaeta, Michele
Toscano, Antonio
Gläser, Dieter
Schoser, Benedikt #
Issue Date: Sep-2015
Publisher: Pergamon Press
Series Title: Neuromuscular Disorders vol:25 issue:9 pages:719-724
Article number: 10.1016/j.nmd.2015.07.002
Abstract: Homozygosity for the common Caucasian splice site mutation c.-32-13T>G in intron 1 of the GAA gene is rather rare in Pompe patients. We report on the clinical, biochemical, morphological, muscle imaging, and genetic findings of six adult Pompe patients from five unrelated families with the c.-32-13T>G GAA gene mutation in homozygous state. All patients had decreased GAA activity and elevated creatine kinase levels. Five patients, aged between 43 and 61 years (median 53 years), initially presented with myalgia, hyperCKaemia, and/or exercise induced fatigue at an age of onset (12-55 years). All but one had proximal lower limb weakness combined with axial weakness and moderate respiratory insufficiency; the sixth patient presented with hyperCKaemia only. Muscle biopsies showed PAS-positive vacuolar myopathy with lysosomal changes and reduced GAA activity. Muscle MRI of lower limb muscles revealed a moderate adipose substitution of the gluteal muscles, biceps femoris and slight fatty infiltration of all thigh muscles. One MRI of the respiratory muscles revealed a diaphragmatic atrophy with unilateral diaphragm elevation. So, the common Caucasian, so called mild, splice site mutation c.-32-13T>G in intron 1 of the GAA gene in a homozygote status reflects the full adult Pompe disease phenotype severity spectrum.
ISSN: 0960-8966
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory for Muscle Diseases and Neuropathies
× corresponding author
# (joint) last author

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