期刊
DEVELOPMENTAL BIOLOGY
卷 489, 期 -, 页码 178-184出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ydbio.2022.06.011
关键词
Artemia; Abdomen; Engrailed; Hox; Pancrustacea; Abdominal-B
The study shows that Abd-B gene is expressed in all abdominal segments of Artemia, but later becomes restricted to two genital segments and T11 appendages. This suggests that Abd-B plays a role in specifying abdominal segment identity in crustaceans and implies a common evolutionary origin for the crustacean abdomen.
The brine shrimp, Artemia franciscana, has a body plan composed of 11 thoracic segments, followed by 2 genital segments, and then 6 additional abdominal segments. Previous studies of Artemia reported that expression of the posterior-most Hox gene, Abdominal-B (Abd-B), is restricted to the genital segments and is not observed poste-riorly in the abdomen at any developmental stage. This report was remarkable because it suggested that the Artemia abdomen posterior to the genital segments was a novel body region of 6 segments that bore no homology to any region in other crustaceans and was unique amongst arthropods in being a Hox-free segmented domain outside of the head. In this study, we used RT-PCR, antibody staining, and in situ hybridization on various stages of Artemia nauplii to show that Abd-B mRNA and protein are in fact expressed throughout the abdominal segments during Artemia development, but this expression later retracts to the two genital segments (G1, G2) and the T11 appendages. This suggests that Abd-B does play a role in specifying abdominal segment identity in all crustaceans that have been examined and suggests a common evolutionary origin for the crustacean abdomen.
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