Isolation of genes identified in mouse renal proximal tubule by comparing different gene expression profiles.

Abstract:

:An expression profile is a list based on a large scale sequencing of 1000 cDNA clones, showing the expressed genes and the abundance of their transcripts in a given cell or tissue (Okubo K et al: Nature Genet 2:173, 1992). We constructed an expression profile of mouse renal proximal tubules (PT) carefully isolated by microdissection in order to characterize its gene expression. Altogether 1000 clones were analyzed; there were 646 types of transcripts in PT, among which 196 were identical or homologous to the previously reported genes. The most abundant transcript was kidney-androgen regulated protein. By comparing the expression profile of PT with those obtained from other sources, several genes were identified only in PT. They included known transcripts and transcripts that were not homologous to the known genes. Three (GS4001, 3991, and 4059) of the non-homologous genes were analyzed by Northern blotting and in situ hybridization, and GS4001 and 4059 were predominantly expressed in the kidney, whereas GS3991 was detected in the liver as well as in the kidney. The sequence analysis of the full-size cDNAs demonstrated that GS4001 was a new member of aspartic proteinases and GS4059 was a novel gene. It also revealed that GS3991 was a mouse homologue of SA gene known to be expressed in PT. The expression profile of mouse PT and its comparison with those of other tissues and cells provide an alternate way of isolating genes predominantly expressed in PT, and also provides probes to study the molecular mechanisms of gene expression in the kidney.

journal_name

Kidney Int

journal_title

Kidney international

authors

Takenaka M,Imai E,Kaneko T,Ito T,Moriyama T,Yamauchi A,Hori M,Kawamoto S,Okubo K

doi

10.1046/j.1523-1755.1998.00808.x

subject

Has Abstract

pub_date

1998-03-01 00:00:00

pages

562-72

issue

3

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)60430-6

journal_volume

53

pub_type

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