Chromosomal clustering of genes controlled by the aire transcription factor.
Autoimmune regulator (aire) is a transcription factor that controls the self-reactivity of the T cell repertoire. Although previous results indicate that it exerts this function in part by promoting ectopic expression of a battery of peripheral-tissue antigens in epithelial cells of the thymic medulla, recent data argue for additional roles in negative selection of thymocytes by medullary cells. As one approach to exploring such roles, we performed computational analyses of microarray data on medullary RNA transcripts from aire-deficient versus wild-type mice, focusing on the genomic localization of aire-controlled genes. Our results highlight this molecule's transcriptional activating and silencing roles and reveal a significant degree of clustering of its target genes. On a local scale, aire-regulated clusters appeared punctate, with aire-controlled and aire-independent genes often being interspersed. This pattern suggests that aire's action may not be a simple reflection of the wide action of a chromatin remodeling enzyme. Analysis of the identity of certain of the clustered genes was evocative of aire's potential roles in antigen presentation and the coordination of intrathymic cell migration: for example, major histocompatibility complex class I and class II gene products and certain chemokine genes are targets of aire-regulated transcription.
Johnnidis
Jonathan B
JB
Section on Immunology and Immunogenetics, Joslin Diabetes Center, USA.
Venanzi
Emily S
ES
Taxman
Debra J
DJ
Ting
Jenny P-Y
JP
Benoist
Christophe O
CO
Mathis
Diane J
DJ
D000818:Animals; D033481:Chromosomes, Mammalian / Q000235:genetics*; D016000:Cluster Analysis; D019295:Computational Biology / Q000379:methods; D005786:Gene Expression Regulation / Q000235:genetics*; D008285:Major Histocompatibility Complex / Q000235:genetics; D051379:Mice; D020411:Oligonucleotide Array Sequence Analysis; D012680:Sensitivity and Specificity; D013950:Thymus Gland / Q000166:cytology / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D000096927:AIRE Protein
D014157:Transcription Factors; D000096927:AIRE Protein