N29 of the consensus sequence is replaced by a Lys within the second Cys pair of the zinc finger motif.
T16001847R
N825K | srp-PA; N810K | srp-PB; N307K | srp-PD; N292K | srp-PE; N307K | srp-PF; N307K | srp-PG; N342K | srp-PH
N511K
Site of nucleotide substitution in mutant inferred by FlyBase based on reported amino acid change.
srp3 mutant stage 13 embryos exhibit decreased efferocytosis, as shown by the decreased number of apoptotic particles per macrophage,
Mutant embryos show defects in visceral mesoderm elongation and have a strong strong germ band retraction phenotype.
Crystal cell marker expression is lost in srp3 homozygous embryos.
The development of the tracheal dorsal trunk appears to be normal.
Homozygous embryos show transformation of the anterior midgut to foregut and transformation of the posterior midgut to hindgut. Germ cells are internalised into the forming gut at the beginning of gastrulation. Many germ cells remain trapped in the pocket formed by the abnormal gut, while approximately 50% manage to exit the gut and are found in random positions within the embryo.
The fat body fails to form and the dorsolateral fat body is partly transformed into gonadal mesoderm.
Germband retraction and dorsal closure fail to occur in homozygous embryos.
Mutants become distinguishable from wild type during stage 10 of embryogenesis. Cells of the prospective posterior midgut fail to lose their epithelial character and form a mesenchyme. Instead cells form a large cavity that is contiguous with the hindgut, composed of a columnar epithelium resembling the epithelium of the hindgut. No prospective anterior midgut cells, normally derived from the tip of the ventral furrow, attach to the posterior side of the stomodeum, and the anterior part of the midgut is not formed. The anterior part of the digestive tract becomes a blind-ended tube of ectodermal foregut. The endoderm fails to differentiate. The prospective anterior midgut acquires properties of the ectodermal foregut. Rudimentary Malpighian tubules develop at the correct position. In some older embryos uric acid is detectable within the lumen of the hindgut and epithelial cavity.
srp3 has embryonic/larval crystal cell phenotype, non-suppressible by lzUAS.cBa/Scer\GAL4twi.PG
srp3/srp[+] is a suppressor of lamellocyte | larval stage phenotype of ushVX22
srp3/srp[+] is a non-suppressor of hemocyte | larval stage phenotype of ushVX22
Bfcko, srp3 has embryonic/larval plasmatocyte | embryonic stage 13 phenotype
hkb2, srp3 has embryonic Malpighian tubule phenotype
hkb2, srp3 has embryonic/larval midgut primordium phenotype
The loss of crystal cell marker expression in srp3 homozygous embryos is not suppressed by lzScer\UAS.cBa; Scer\GAL4twi.PG.