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Clinical data and analyzed the PHKA2 gene of 17 Chinese male patients suspected of having Glycogen storage disease (GSD) type IXa; study detected 14 mutations in 17 patients, including 8 novel mutations; exons 2 and 4 were hot spots.
In this study we summarized the PHKA2 mutation spectrum in Korean glycogen storage disease type IX patients and found that the most common mutation type was gross deletion.
The present case also represents the first known reported case of liver PhK deficiency with an PHKA2 mutation and liver cirrhosis.
We found that the missense mutation p.Pro1205Leu in the PHKA2 gene is a common cause of hepatic phosphorylase-kinase deficiency in Dutch patients, suggesting a founder-effect
two novel mutations found in two GSD type IX patients with different residual enzyme activities
Gene analysis was confirmed to represent a useful procedure for diagnosing x-linked liver glycogenosis, for which liver biopsy had previously been required to detect hepatic phosphorylase kinase deficiency
alpha- and beta-subunits possess amino-terminal glucoamylase-like domains and suggests that they might possess a previously overlooked amylase activity
Alu-mediated, large deletion-spanning introns 19-26 in PHKA2 is associated with X-linked liver glycogenosis
Results show that phosphorylase kinase (PhK) alpha subunit missense mutations or small in-frame deletions/insertions may have a direct impact on the PhK alpha functions.
Phosphorylase kinase is a polymer of 16 subunits, four each of alpha, beta, gamma and delta. The alpha subunit includes the skeletal muscle and hepatic isoforms, and the hepatic isoform is encoded by this gene. The beta subunit is the same in both the muscle and hepatic isoforms, and encoded by one gene. The gamma subunit also includes the skeletal muscle and hepatic isoforms, which are encoded by two different genes. The delta subunit is a calmodulin and can be encoded by three different genes. The gamma subunits contain the active site of the enzyme, whereas the alpha and beta subunits have regulatory functions controlled by phosphorylation. The delta subunit mediates the dependence of the enzyme on calcium concentration. Mutations in this gene cause glycogen storage disease type 9A, also known as X-linked liver glycogenosis. Alternatively spliced transcript variants have been reported, but the full-length nature of these variants has not been determined.
phosphorylase b kinase regulatory subunit alpha liver isoform
, phosphorylase b kinase regulatory subunit alpha, liver isoform
, phosphorylase kinase alpha L subunit
, phosphorylase kinase alpha-subunit
, phosphorylase kinase, alpha 2 (liver)
, phosphorylase kinase, alpha 2 (liver) isoform 1
, phosphorylase kinase, alpha 2 (liver) isoform 2
, Phosphorylase b kinase regulatory subunit alpha, liver isoform
, Phosphorylase kinase alpha L subunit
, phosphorylase b kinase regulatory subunit alpha, liver isoform-like