Mutations in exons 2 and 3 of the cationic trypsinogen gene in Japanese families with hereditary pancreatitis.
OBJECTIVE
Single-point mutations in the cationic trypsinogen gene have been reported in hereditary pancreatitis kindreds in the white population. The aim of the present study was to investigate whether similar gene mutations are present in Japanese hereditary pancreatitis kindreds.


METHODS
All five exons of the cationic trypsinogen gene were amplified by polymerase chain reaction and sequenced in six Japanese families with hereditary pancreatitis.


RESULTS
Two types of single-point mutation in the cationic trypsinogen gene, which were identical with those reported in white families with hereditary pancreatitis, were observed in separate Japanese families with hereditary pancreatitis: 21Asn (AAC) to Ile (ATC) (N21I) in exon 2 and 117Arg (CGC) to His (CAC) (R117H) in exon 3. Pancreatitis occurred at more advanced ages in patients with the N21I mutation than in those with the R117H mutation. Besides normal polymorphisms in exons 4 and 5, no mutation was found in patients in the remaining four families with hereditary pancreatitis, 21 patients with sporadic chronic pancreatitis, or five normal subjects.


CONCLUSIONS
These results show heterogeneity, but no racial specificity, in the cationic trypsinogen gene mutations in hereditary pancreatitis kindreds. A distinctive clinical feature for each of the mutation types is suggested: adult onset for the N21I mutation and childhood onset for the R117H mutation.
Nishimori
I
I
First Department of Internal Medicine, Kochi Medical School, Kochi, Japan.
Kamakura
M
M
Fujikawa-Adachi
K
K
Morita
M
M
Onishi
S
S
Yokoyama
K
K
Makino
I
I
Ishida
H
H
Yamamoto
M
M
Watanabe
S
S
Ogawa
M
M
D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D000595:Amino Acid Sequence; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D005091:Exons / Q000235:genetics*; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008969:Molecular Sequence Data; D010195:Pancreatitis / Q000235:genetics*; D010375:Pedigree; D017354:Point Mutation; D016133:Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D014362:Trypsinogen / Q000737:chemistry / Q000235:genetics*
D014362:Trypsinogen