Drosophila forkhead homologues are expressed in a lineage-restricted manner in human hematopoietic cells.
The forkhead gene (FKH) regulates morphogenesis in Drosophila. It is the prototype of a new family of transcriptional activators. Partially degenerate oligonucleotides to two conserved amino acid sequences of this family were used to prime a polymerase chain reaction (PCR) amplification of HEL cell cDNA. Two unique clones, designated H3 and H8, were isolated that contained homologies to FKH. A third novel clone, 5-3, was isolated by low stringency screening of a chronic myelogenous leukemia cDNA library using H8 as a probe. H3 and 5-3 are preferentially expressed in restricted hematopoietic lineages, while the expression of H8 was ubiquitous. Southern analysis showed that FKH 5-3 is conserved through yeast, which is rare among tissue-specific transcription factors. The H3 and 5-3 clones provide evidence that FKH family members are present in a tissue-restricted manner in humans.
Hromas
R
R
Department of Hematology/Oncology, Indiana University Medical Center, Indianapolis 46202-5121.
Moore
J
J
Johnston
T
T
Socha
C
C
Klemsz
M
M
D000595:Amino Acid Sequence; D001483:Base Sequence; D015139:Blotting, Southern; D003001:Cloning, Molecular; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000235:genetics*; D051858:Forkhead Transcription Factors; D015870:Gene Expression; D005796:Genes; D006412:Hematopoietic Stem Cells / Q000378:metabolism*; D006801:Humans; D008969:Molecular Sequence Data; D009024:Morphogenesis; D009687:Nuclear Proteins / Q000235:genetics* / Q000378:metabolism; D009838:Oligodeoxyribonucleotides / Q000737:chemistry; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000235:genetics; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics*
D004268:DNA-Binding Proteins; D051858:Forkhead Transcription Factors; D009687:Nuclear Proteins; D009838:Oligodeoxyribonucleotides; D012333:RNA, Messenger; D014157:Transcription Factors