Polytene chromosomes normal (Judd).
Single nucleotide deletion at position 1181 of the putative mRNA results in a frameshift. This is predicted to reduce the size of the protein product from 450kD to 400kD.
larval brain & neuroblast
trol13 homozygotes have normal numbers of S phase larval neuroblasts per brain lobe.
Normal larval brain histology. Male adult escapers have a roughened eye phenotype: irregular packing and size of ommatidia, aberrant bristle placement and number. Gynandromorph analysis shows the brain phenotype is due to misrotation of the optic lobes and misrouted retinula or lamina fibres. Hemizygous males and homozygous females show reduced flight/escape response.
Lethality occurs during larval and pupal stages. The growth rate begins to decrease during the second larval instar. Mosaic analysis demonstrates mutant phenotype is non-autonomous.
trol13 has decreased occurrence of cell division | larval stage phenotype, enhanceable by ttv[+]/ttv00681b
trol13 has partially lethal - majority die phenotype, enhanceable by +/Df(2R)X1
trol13 has partially lethal - majority die phenotype, enhanceable by Df(2R)B5/+
trol13 has partially lethal - majority die phenotype, enhanceable by Df(2R)eve/+
trol13 has partially lethal - majority die phenotype, enhanceable by eve[+]/eve5
trol13 has partially lethal - majority die phenotype, enhanceable by eve[+]/eve1
trol13 has partially lethal - majority die phenotype, enhanceable by eve3/eve[+]
trol13 has partially lethal - majority die phenotype, enhanceable by eve[+]/eve4
trol13 has partially lethal - majority die phenotype, enhanceable by evetPa
trol13 has partially lethal - majority die phenotype, non-enhanceable by Df(2R)stan2
eve3/eve[+], trol13 has decreased occurrence of cell division | third instar larval stage phenotype, suppressible | partially by CycEhs.PR
hh[+]/hh21, trol13 has decreased occurrence of cell division | larval stage phenotype
btlLG19/btl[+], trol13 has decreased occurrence of cell division | larval stage phenotype
hh[+]/hh2, trol13 has decreased occurrence of cell division | larval stage phenotype
bnl06916/bnl[+], trol13 has decreased occurrence of cell division | larval stage phenotype
hh[+]/hhts2, trol13 has decreased occurrence of cell division | larval stage | temperature conditional phenotype
eve3/eve[+], trol13 has decreased occurrence of cell division | third instar larval stage phenotype
eve3/eve[+], trol13 has decreased occurrence of cell division | larval stage phenotype
eve[+]/eve4, trol13 has decreased occurrence of cell division | larval stage phenotype
trol13 has neuroblast | larval stage phenotype, enhanceable by btlLG19/btl[+]
trol13 has neuroblast | larval stage phenotype, enhanceable by hh[+]/hh2
trol13 has neuroblast | larval stage phenotype, enhanceable by hh[+]/hhAC
trol13 has neuroblast | larval stage phenotype, enhanceable by bnl06916/bnl[+]
trol13 has neuroblast | larval stage phenotype, non-enhanceable by htlAB42/htl[+]
trol13/trol13 is a suppressor of neuroblast | larval stage | heat sensitive phenotype of hhts2
hh[+]/hh21, trol13 has neuroblast | larval stage phenotype
trol13, ttv00681b has neuroblast | larval stage phenotype
hh21, trol13 has neuroblast | larval stage phenotype
trol13/trol13; bnl06916/+ and trol13/trol13; btlLG19/+ larvae, but not trol13/trol13; htlAB42/+ larvae have reduced numbers S phase neuroblasts per brain lobe compared to trol13 homozygotes. trol13/trol13; larvae, heterozygous for hh2or hhAC have reduced numbers S phase neuroblasts per brain lobe compared to trol13 homozygotes. trol13/trol13; heterozygous for hh21 have increased numbers of S phase neuroblasts per brain lobe compared to trol13 homozygotes.
96% of trol13/Y ; eve3/+ animals show defective proliferation of larval brain neuroblasts. The addition of CycEhs.PR (without heat shock) reduces the number of animals with defective proliferation to 35%, and expression of CycEhs.PR using a 30 minute heat shock rescues the neuroblast phenotype almost completely. Weak induction of CycEhs.PR does not rescue the enhanced lethality of trol13/Y ; eve3/+ animals. trol13/Y ; eve3/+ brains cultured in an explant assay in larval extract from eve3/+ or trol13/Y ; eve3/+ animals show a reduced amount of proliferation compared to wild-type brains cultured in larval extract from wild-type animals. In contrast, trol13/Y ; eve3/+ brains cultured in larval extract from wild-type animals have a level of proliferation close to that seen in controls (wild-type brains cultured in larval extract from wild-type animals). No trol13 brains cultured in larval extract from eve3/+ animals show normal proliferation. Addition of ecdysone rescues defective proliferation in trol13/Y ; eve3/+ brains cultured in larval extract from trol13/Y ; eve3/+ animals.
The trol13/Y semi-lethality is dominantly enhanced by Df(2R)X1, Df(2R)B5 or Df(2R)eve. These deficiences also show a strong transheterozygous effect in trol13/+ females, resulting in a reduction in viability. The semi-lethality is not dominantly enhanced by Df(2R)stan2. The semi-lethality of trol13/Y males is also dominantly enhanced by eve5, eve1, eve3 and eve4 and these alleles also show a transheterozygous effect in trol13/+ females, resulting in a reduction in viability. trol13/Y males carrying evetPa show reduced viability compared to control siblings. If the trol13 larvae are also heterozygous for either eve3 or eve4 then the number of S phase neuroblasts per brain lobe is reduced. If the trol13 larvae are also heterozygous for eve5, then the number of S phase neuroblasts per brain lobe is reduced in 66% of larvae and unaffected in 33% of larvae.
Judd, 22 Feb. 1962.
Shows no maternal-zygotic interaction.
Heteroallelic combinations are fully lethal.