Abstract:
:Hartnup disorder is an autosomal recessive phenotype involving a transporter for monoamino-monocarboxylic acids. Genetic analysis of the mouse model mapped its locus to human chromosome 11q13 (8). We report here the results of linkage analysis in two Japanese first cousin-marriage families. In the first family, the proband had Hartnup disorder and his deceased older brother was reported to have had typical Hartnup symptoms. The younger brother of the proband was shown to have decreased tryptophan absorption by oral loading test. In the second family, a 6-year-old girl, the proband, had specific hyperaminoaciduria. DNA was isolated from either blood samples or umbilical cord stumps. Genome-wide screening by homozygosity mapping was conducted. Taking into account that the older brother was affected and the younger brother was a carrier in the first family, homozygosity mapping (LOD score = 3.55) and GENEHUNTER (LOD score = 3.28) locates the locus of the Hartnup disorder on 5p15.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Nozaki J,Dakeishi M,Ohura T,Inoue K,Manabe M,Wada Y,Koizumi Adoi
10.1006/bbrc.2001.4961subject
Has Abstractpub_date
2001-06-08 00:00:00pages
255-60issue
2eissn
0006-291Xissn
1090-2104pii
S0006291X01949617journal_volume
284pub_type
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