THE GLUTAMATE-DEHYDROGENASE, E74 AND PUTATIVE ACTIN GENE LOCI IN THE DROSOPHILA-MONTIUM SUBGROUP - CHROMOSOMAL HOMOLOGIES AMONG THE MONTIUMSPECIES AND DROSOPHILA-MELANOGASTER
E. Drosopoulou et al., THE GLUTAMATE-DEHYDROGENASE, E74 AND PUTATIVE ACTIN GENE LOCI IN THE DROSOPHILA-MONTIUM SUBGROUP - CHROMOSOMAL HOMOLOGIES AMONG THE MONTIUMSPECIES AND DROSOPHILA-MELANOGASTER, Chromosoma, 106(1), 1997, pp. 20-28
DNA-specific sequences from an enzyme-coding gene (glutamate dehydroge
nase, gdh), a regulatory protein-coding gene (E74) and genes of the ac
tin family were mapped by in situ hybridization on the polytene chromo
somes of six species representative of the geographical distribution o
f the Drosophila montium subgroup of the melanogaster species group. I
n all species studied, one hybridization signal was detected for the g
dh and E74 genes, and seven signals for the actin genes. The distribut
ion of the actin-related loci in five montium species is similar to th
at of the other Drosophila species studied so far, although they prese
nt an extra signal. This distribution differs in the sixth montium spe
cies studied, D. kikkawai. Taking into account the present results, as
well as previous data obtained mainly by in situ hybridizations, homo
logies among the polytene chromosomes of the montium subgroup species,
as well as between these species and D. melanogaster, were also estab
lished.