Single base change in the mechanochemical domain which affects the highly conserved putative ATP-binding/hydrolysis domain. Nucleotide substitution: G352A. Amino acid replacement: S94N. It is unlikely there is an additional mutation in the regulatory region although this region was not sequenced.
G11581268A
G352A
S94N | nod-PA; S94N | nod-PB
S94N
meiosis & nuclear chromosome | female
Heterozygous females show high rates of nondisjunction (57%) for the 4th chromosome and 0.8% nondisjunction for the X chromosome.
Dominant meiotic phenotype varies with dosage and temperature: at 25oC only non-exchange chromosomes undergo nondisjunction and loss, at lower temperatures segregation of both exchange and nonexchange chromosomes is affected.
Dominant meiotic mutation. The effect of E(DTW) is dose-dependent, one copy enhances the phenotype while two copies renders the fly nearly sterile.
Defects in meiotic and mitotic chromosome segregation. At 23.5oC heterozygous females exhibit the meiotic defect of abnormal segregation of nonexchange chromosomes. At 18oC in homozygous or heterozygous females the meiotic defect is more severe causing defects in the segregation of both exchange and nonexchange chromosomes. Homozygous and hemizygous males exhibit mitotic defects including somatic chromosome breakage and loss. A single dose of nodDTW is not sufficient to cause cold sensitivity, whether or not wild type protein is present.
Reduced survival when raised at 17oC compared with that when raised at 25oC; the differences in survival at the two temperatures vary substantially among replicate crosses. embryonic lethal female-sterile at 16oC
mei-2181, nodDTW has abnormal meiotic cell cycle | female phenotype, suppressible by lwr05486
nodDTW has abnormal meiotic cell cycle | female phenotype, suppressible by lwr5/lwr[+]
nodDTW has abnormal meiotic cell cycle | dominant | female phenotype, suppressible by lwr05486/lwr[+]
mei-2181, nodDTW has abnormal meiotic cell cycle | female phenotype
nebTE8, nodDTW has female sterile | dominant phenotype
nebTE12, nodDTW has female sterile | dominant phenotype
nebTE20, nodDTW has female sterile | dominant phenotype
lwr05486 or lwr5 dominantly suppress the nondisjunction phenotype of nodDTW females. nodDTW mei-2181 double homozygous females show 60% X chromosome nondisjunction and 63% 4th chromosome nondisjunction. Oocyte spindles are often frayed or oddly shaped, or multiple spindles are present. These defects are suppressed by lwr05486/+.
Wright.
"l(1)TW6cs" has been renamed nodDTW.