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Clustered organization of homologous KRAB zinc-finger genes with enhanced expression in human T lymphoid cells
Bellefroid, Eric J.; Marine, Jean-Christophe; Ried, Thomas et al.
1993In EMBO Journal, 12 (4), p. 1363-1374
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Keywords :
zinc-finger; T lymphoid cells; KRAB
Abstract :
[en] KRAB zinc-finger proteins (KRAB-ZFPs) constitute a large subfamily of ZFPs of the Krüppel C2H2 type. KRAB (Krüppel-associated box) is an evolutionarily conserved protein domain found N-terminally with respect to the finger repeats. We report here the characterization of a particular subgroup of highly related human KRAB-ZFPs. ZNF91 is one representative of this subgroup and contains 35 contiguous finger repeats at its C-terminus. Three mRNA isoforms with sequence identity to ZNF91 were isolated by the polymerase chain reaction. These encode proteins with a KRAB domain present, partially deleted or absent. Five genomic fragments were characterized, each encoding part of a gene: the ZNF91 gene or one of four distinct, related KRAB-ZFP genes. All exhibit a common exon/intron organization with the variant zinc finger repeats organized in a single exon and the KRAB domain encoded by two separate exons. This positioning of introns supports the hypothesis that the mRNA isoforms encoding polypeptides with variability in the KRAB domain could arise by alternative splicing. By in situ chromosomal mapping studies and by analysis of fragments from a human genomic yeast artificial chromosome library containing KRAB-ZFP genes, we show that these genes occur in clusters; in particular, a gene complex containing over 40 genes has been identified in chromosomal region 19p12-p13.1. These ZNF91-related genes probably arose late during evolution since no homologous genes are detected in the mouse and rat genomes. Although the transcription of members of this KRAB-ZFP gene subgroup is detectable in all human tissues, their expression is significantly higher in human T lymphoid cells.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Bellefroid, Eric J.
Marine, Jean-Christophe
Ried, Thomas
Lecocq, Pierre J
Riviere, Michele
Amemiya, Chris
Poncelet, Dominique A
Coulie, Pierre G
de Jong, Pieter
Szpirer, Claude
Ward, David C
Martial, Joseph ;  Université de Liège - ULiège > Département des sciences de la vie > GIGA-R : Biologie et génétique moléculaire
Language :
English
Title :
Clustered organization of homologous KRAB zinc-finger genes with enhanced expression in human T lymphoid cells
Publication date :
1993
Journal title :
EMBO Journal
ISSN :
0261-4189
eISSN :
1460-2075
Publisher :
Oxford University Press, Oxford, United Kingdom
Volume :
12
Issue :
4
Pages :
1363-1374
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 26 August 2009

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