Polytene chromosomes normal.
The deletion uncovers the nuclease hypersensitive region of the Mcp, continuing distally towards the iab-5 region.
3.5kb deletion in the cis regulatory region, removing a silencer element MCP725.
Deletion of a 3.6kb DNA segment from the region in between iab-4 and iab-5 cis-regulatory domains (from map position +94 to +97.6kb in the bithorax complex).
Alteration at coordinate +94-97.6kb, proximal to the Abd-B transcript.
94-97.6 kb deleted.
Abd-BMcp-1 embryos exhibit in parasegment 9 a pattern of Abd-B expression that is normally seen in parasegment 10, both in the epidermis and in the ventral nerve cord.
adult cuticle & abdominal segment 3 | male
adult cuticle & abdominal segment 4 | male
heterozygous mutant adults have a pigments abdominal segment 4, showing a transformation of the a4 to a5. This is seen in 100% of mutants, with constant and high expressivity.
Heterozygous males show a decrease in the total amount of both monoene and 7,11-diene cuticular hydrocarbons compared to wild-type males. Heterozygous females show a significant increase in the level of monoene cuticular hydrocarbons and a significant decrease in the level of 7,11-diene cuticular hydrocarbons compared to wild-type females.
In males homozygous for Abd-BMcp-1,Abd-BSab-1, male specific pigmentation is expanded into A3 and A4.
A4 is transformed to A5 identity and is a darkly pigmented.
Abd-BMcp-1/Abd-BMcp-1 is a suppressor | partially of visible | recessive phenotype of brkMcp
Abd-BMcp-1 has phenotype, enhanceable by Pcl1
Abd-BMcp-1 has abdominal segment 5 | ectopic phenotype, suppressible by TrlR85
Abd-BMcp-1 has abdominal segment 4 phenotype, suppressible by TrlR85
Abd-BMcp-1/Abd-BMcp-1 is a suppressor | partially of wing phenotype of brkMcp
Abd-BMcp-1, ph-d1 has abdominal segment 3 phenotype
Abd-BMcp-1, ph-d2 has abdominal segment 3 phenotype
The penetrance of the wing defect phenotype caused by brkMcp is decreased to 7.7% if the animals are also homozygous for Abd-BMcp-1.
96% of Abd-BMcp-1, TrlR85 double heterozygotes have a partially de-pigmented abdominal segment 4.
Crosby.
M. Crosby.
m- r+ mutant, with defect in spatial regulation of Abd-B function. No effect on penetrance of head defect phenotype when in trans with Abd-Biab9-tuh-3.
The phenotype of Abd-BMcp-1/Abd-BMcp-1 closely resembles that of Abd-BCst/+.
DNase hypersensitivity assays reveal the deletion contains one very prominent nuclease sensitive region as well as several minor hypersensitive sites. Mcp appears to be associated with an unusual chromatin structure.