Serum amino acids in patients with mutations in the hepatocyte nuclear factor-1 alpha gene.
OBJECTIVE
Knockout mice lacking both copies of the hepatocyte nuclear factor 1 (HNF1) gene have altered serum levels of amino acids and generalized aminoaciduria. The aim of our study was to test whether alterations in serum amino acid levels were found in patients with mutations in the hepatocyte nuclear factor-1 alpha (HNF-1alpha) gene compared with controls.


METHODS
Fasting serum from 20 patients with HNF-1alpha mutations and 20 age, sex and body mass index-matched controls was analysed for 16 amino acids. Means were compared between the two groups and Z scores calculated.


RESULTS
There was no significant difference between patients with HNF-1alpha mutations and controls in serum levels of phenylalanine, arginine, citrulline or lysine as suggested by knockout mice models. Although serum levels of eight amino acids were different in the two groups, these were not significant after Bonferroni correction.


CONCLUSIONS
The alterations in serum amino acid levels seen in mice models are not seen in patients with mutations in the HNF-1alpha gene. This suggests differences in mouse and man in the regulation of amino acid transport and has not provided us with a phenotypic marker to use before confirmatory genetic testing.
Department of Diabetes and Vascular Medicine, Peninsula Medical School, Exeter, UK.
A
A
Stride
E R
ER
Pearson
A
A
Brown
K
K
Gooding
H A J
HA
Castleden
A T
AT
Hattersley
D000596:Amino Acids / Q000097:blood*; D015992:Body Mass Index; D004268:DNA-Binding Proteins / Q000097:blood / Q000235:genetics*; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000235:genetics*; D005260:Female; D051537:Hepatocyte Nuclear Factor 1; D051538:Hepatocyte Nuclear Factor 1-alpha; D006801:Humans; D008297:Male; D008875:Middle Aged; D009154:Mutation / Q000235:genetics*; D009687:Nuclear Proteins / Q000097:blood / Q000235:genetics*; D014157:Transcription Factors / Q000097:blood / Q000235:genetics*
D000596:Amino Acids; D004268:DNA-Binding Proteins; C496487:HNF1A protein, human; D051538:Hepatocyte Nuclear Factor 1-alpha; D009687:Nuclear Proteins; D014157:Transcription Factors; D051537:Hepatocyte Nuclear Factor 1