Abstract:
:We describe here a new type of X-linked liver glycogen storage disease. The main symptoms include liver enlargement and growth retardation. The clinical and biochemical abnormalities of this glycogenosis are similar to those of classical X-linked liver glycogenosis due to phosphorylase kinase deficiency (XLG). However, in contrast to patients with XLG, the patients described here have no reduced phosphorylase kinase activity in erythrocytes and leukocytes, and no enzyme deficiency could be found. Linkage analysis of four families with this X-linked type of liver glycogenosis assigned the disease gene to Xp22. Lod scores obtained with the markers DXS987, DXS207, and DXS999 were 3.97, 2.71, and 2.40, respectively, all at 0% recombination. Multipoint linkage analysis localized the disease gene between DXS143 and DXS989 with a maximum lod score of 4.70 at theta = 0, relative to DXS987. As both the classical XLG gene and the liver alpha-subunit of PHK (PHKA2) are also located in Xp22, this variant type of XLG may be allelic to classical XLG, and both diseases may be caused by mutations in PHKA2. Therefore, we propose to classify XLG as XLG type I (the classical type of XLG) and XLG type II (the variant type of XLG).
journal_name
Genomicsjournal_title
Genomicsauthors
Hendrickx J,Coucke P,Hors-Cayla MC,Smit GP,Shin YS,Deutsch J,Smeitink J,Berger R,Lee P,Fernandes Jdoi
10.1006/geno.1994.1322subject
Has Abstract,Author List Incompletepub_date
1994-06-01 00:00:00pages
620-5issue
3eissn
0888-7543issn
1089-8646pii
S088875438471322Xjournal_volume
21pub_type
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