Assignment of the human MAD and MXI1 genes to chromosomes 2p12-p13 and 10q24-q25.
MAD and MXI1, two recently described members of the basic helix-loop-helix (bHLH) gene family, encode proteins that dimerize with and modulate the DNA binding of max. In turn, mad-max or mxi1-max heterodimers or max homodimers can compete for DNA binding sites with dimers formed between max and myc oncoproteins and antagonize the transcriptional activities of this latter class of proteins. Using a combination of somatic cell mapping and fluorescence in situ hybridization techniques, we have determined the chromosomal locations of the MAD and MXI1 genes. The MAD gene maps to chromosome 2p12-p13, a region involved in translocations and deletions in acute and chronic lymphocytic leukemias as well as non-lymphocytic leukemias and Hodgkin disease. The MXI1 gene localizes to chromosome 10q24-q25, a region involved in translocations and deletions in acute and chronic lymphocytic leukemias and prostatic carcinomas. The availability of genomic clones of MAD and MXI1 will permit an assessment of their involvement in these diseases at the molecular level.
Shapiro
D N
DN
Department of Experimental Oncology, St. Jude Children's Research Hospital, Memphis, Tennessee 38101.
Valentine
V
V
Eagle
L
L
Yin
X
X
Morris
S W
SW
Prochownik
E V
EV
D000818:Animals; D001483:Base Sequence; D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors; D051792:Basic Helix-Loop-Helix Proteins; D050976:Basic-Leucine Zipper Transcription Factors; D001665:Binding Sites; D002879:Chromosomes, Human, Pair 10; D002889:Chromosomes, Human, Pair 2; D004247:DNA / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D005796:Genes; D018257:Helix-Loop-Helix Motifs / Q000235:genetics; D006801:Humans; D007938:Leukemia / Q000235:genetics; D051379:Mice / Q000235:genetics; D008969:Molecular Sequence Data; D009369:Neoplasms / Q000235:genetics; D055503:Protein Multimerization; D012097:Repressor Proteins; D013045:Species Specificity; D014157:Transcription Factors; D014178:Translocation, Genetic; D025521:Tumor Suppressor Proteins
D051778:Basic Helix-Loop-Helix Leucine Zipper Transcription Factors; D051792:Basic Helix-Loop-Helix Proteins; D050976:Basic-Leucine Zipper Transcription Factors; D004247:DNA; D004268:DNA-Binding Proteins; D012097:Repressor Proteins; D014157:Transcription Factors; D025521:Tumor Suppressor Proteins; C499330:MAX protein, human; C079439:MXD1 protein, human; C079440:MXI1 protein, human; C499479:Mad protein, mouse; C512788:Mxi1 protein, mouse; C067850:Myc associated factor X; C068422:Max protein, mouse