Preferential expression of kin, a nuclear protein binding to curved DNA, in the neurons of the adult rat.
The KIN17 gene product has been identified by cross immunoreactivity with anti-RecA antibodies and by DNA recombination techniques, and is probably part of the DNA recombination-repair machinery. Following Western blotting and immunocytochemistry using anti-RecA antibodies, and in situ hybridization with specific KIN17 cDNA probes, we here report the detection of high levels of KIN protein and KIN17 mRNA in the CNS of adult rats. The RecA cross-reacting protein has an apparent molecular weight of 41 kDa and is located in the nucleus of brain cells. Both the KIN17 transcript and the protein were found to be widespread, but they were present in different proportions, depending on the type of brain cells. High levels of KIN protein were seen in neurons of the motor nuclei of the brainstem, the locus coeruleus, hippocampal formation, entorhinal cortex, Purkinje cells, pyramidal cells of the cortex and mitral cells. In contrast, using a combination of KIN17 mRNA in situ hybridization and GFAP immunocytochemistry (a marker of glial cells) showed that the KIN17 messenger is preferentially transcribed in neurons, the post-mitotic and long lived brain cells. We postulate that KIN17 play a role in the illegitimate recombination of DNA sequences and/or the repair of alterations of the genome in neurons.
Araneda
S
S
Département de Médecine Expérimentale, Faculté de Médecine, Université Claude Bernard, INSERM U52, CNRS ERS 5645, Lyon, France.
Angulo
J
J
Touret
M
M
Sallanon-Moulin
M
M
Souchier
C
C
Jouvet
M
M
D000367:Age Factors; D000818:Animals; D000918:Antibody Specificity; D015153:Blotting, Western; D001923:Brain Chemistry / Q000235:genetics*; D004260:DNA Repair / Q000502:physiology*; D004268:DNA-Binding Proteins / Q000032:analysis / Q000235:genetics* / Q000276:immunology / Q000378:metabolism*; D004926:Escherichia coli / Q000737:chemistry; D005786:Gene Expression Regulation / Q000502:physiology; D017403:In Situ Hybridization; D008297:Male; D008969:Molecular Sequence Data; D009474:Neurons / Q000737:chemistry / Q000378:metabolism*; D009687:Nuclear Proteins; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats; D017207:Rats, Sprague-Dawley; D011938:Rec A Recombinases / Q000276:immunology; D016335:Zinc Fingers / Q000235:genetics / Q000276:immunology
D004268:DNA-Binding Proteins; C489488:Kin protein, rat; D009687:Nuclear Proteins; D012333:RNA, Messenger; D011938:Rec A Recombinases