{"id":{"repo_id":"lsu-thes","oai_identifier":"oai:repository.lsu.edu:gradschool_dissertations-1980"},"canonical_url":"https://search.dev.ndltd.org/etd/lsu-thes/oai:repository.lsu.edu:gradschool_dissertations-1980","repository":{"repo_id":"lsu-thes","name":"Lousiana State University","base_url":"https://repository.lsu.edu/do/oai/"},"display":{"title":"Genetic and cytological investigation of Nucleostemin-1 in Drosophila melanogaster","abstract":"Mammalian nucleostemin (NS) is a nucleolar GTP-binding protein implicated in cell cycle progression, stem cell proliferation, and ribosome assembly. Drosophila melanogaster contains a four-member nucleostemin family (NS1-4). Nucleostemin 1 (NS1) is the closest orthologue to human NS; it shares 33% identity and 67% similarity with human NS. We show that NS1 has intrinsic GTPase and ATPase activity, and that it is present within nucleoli of most larval and adult cells. Endogenous NS1 and lightly expressed GFP-NS1 enrich within the nucleolar granular regions as expected, while over-expressed GFP-NS1 localizes throughout the nucleolus and nucleoplasm, and to several transcriptionally active inter-bands of polytene chromosomes. Over-expression caused melanotic tumors and larval and pupal lethality. RNAi depletion of NS1 caused a loss of imaginal (precursor) cells in the larval midgut, and an apparent block in the nucleolar release of large ribosomal subunits in the terminally differentiated larval midgut polyploid cells. Depletion of 60% of NS1 transcripts lead to larval and pupal lethality. Ultra-structural examination of highly differentiated larval Malpighian tubule cells depleted for NS1 showed a loss of cytoplasmic ribosomes with a concomitant appearance of cytoplasmic pre-autophagosomes. We interpret the appearance of these structures as indicators of cell stress response.","abstract_html":"Mammalian nucleostemin (NS) is a nucleolar GTP-binding protein implicated in cell cycle progression, stem cell proliferation, and ribosome assembly. Drosophila melanogaster contains a four-member nucleostemin family (NS1-4). Nucleostemin 1 (NS1) is the closest orthologue to human NS; it shares 33% identity and 67% similarity with human NS. We show that NS1 has intrinsic GTPase and ATPase activity, and that it is present within nucleoli of most larval and adult cells. Endogenous NS1 and lightly expressed GFP-NS1 enrich within the nucleolar granular regions as expected, while over-expressed GFP-NS1 localizes throughout the nucleolus and nucleoplasm, and to several transcriptionally active inter-bands of polytene chromosomes. Over-expression caused melanotic tumors and larval and pupal lethality. RNAi depletion of NS1 caused a loss of imaginal (precursor) cells in the larval midgut, and an apparent block in the nucleolar release of large ribosomal subunits in the terminally differentiated larval midgut polyploid cells. Depletion of 60% of NS1 transcripts lead to larval and pupal lethality. Ultra-structural examination of highly differentiated larval Malpighian tubule cells depleted for NS1 showed a loss of cytoplasmic ribosomes with a concomitant appearance of cytoplasmic pre-autophagosomes. We interpret the appearance of these structures as indicators of cell stress response.","abstract_has_math":false,"creators":["Rosby, Raphyel Ojomo"],"institution":"Biological Sciences","degree_name":"Doctor of Philosophy (PhD)","degree_level":"Dissertation","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2010,"date_issued":"2010-01-01T08:00:00Z","date_published":"2010-01-01T08:00:00Z","updated_at":"2026-07-24T02:58:40Z","subjects":["nucleostemin","ribosomes","large subunit","granular component","rRNA","nucleolus","NS-1","autophagy"],"languages":[],"rights":["unrestricted","Release the entire work immediately for access worldwide."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["etd-01232010-063910","https://repository.lsu.edu/gradschool_dissertations/981"],"render_values":[{"text":"etd-01232010-063910","href":null,"code":true},{"text":"https://repository.lsu.edu/gradschool_dissertations/981","href":"https://repository.lsu.edu/gradschool_dissertations/981","code":true}]}]},"links":{"outbound_url":"https://doi.org/10.31390/gradschool_dissertations.981","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Rosby, Raphyel Ojomo"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2010-01-12"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2022-05-12T23:10:38Z"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Doctor of Philosophy (PhD)"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Biological Sciences"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["nucleostemin","ribosomes","large subunit","granular component","rRNA","nucleolus","NS-1","autophagy"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["unrestricted","Release the entire work immediately for access worldwide."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["etd-01232010-063910","10.31390/gradschool_dissertations.981","https://repository.lsu.edu/gradschool_dissertations/981"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Mammalian nucleostemin (NS) is a nucleolar GTP-binding protein implicated in cell cycle progression, stem cell proliferation, and ribosome assembly. Drosophila melanogaster contains a four-member nucleostemin family (NS1-4). Nucleostemin 1 (NS1) is the closest orthologue to human NS; it shares 33% identity and 67% similarity with human NS. We show that NS1 has intrinsic GTPase and ATPase activity, and that it is present within nucleoli of most larval and adult cells. Endogenous NS1 and lightly expressed GFP-NS1 enrich within the nucleolar granular regions as expected, while over-expressed GFP-NS1 localizes throughout the nucleolus and nucleoplasm, and to several transcriptionally active inter-bands of polytene chromosomes. Over-expression caused melanotic tumors and larval and pupal lethality. RNAi depletion of NS1 caused a loss of imaginal (precursor) cells in the larval midgut, and an apparent block in the nucleolar release of large ribosomal subunits in the terminally differentiated larval midgut polyploid cells. Depletion of 60% of NS1 transcripts lead to larval and pupal lethality. Ultra-structural examination of highly differentiated larval Malpighian tubule cells depleted for NS1 showed a loss of cytoplasmic ribosomes with a concomitant appearance of cytoplasmic pre-autophagosomes. We interpret the appearance of these structures as indicators of cell stress response."]},{"key":"dc:title","label":"Title","values":["Genetic and cytological investigation of Nucleostemin-1 in Drosophila melanogaster"]}]}],"canonical_facts":{"dc:creator":["Rosby, Raphyel Ojomo"],"dc:date":["2010-01-12"],"dc:date.available":["2022-05-12T23:10:38Z"],"dc:description.abstract":["Mammalian nucleostemin (NS) is a nucleolar GTP-binding protein implicated in cell cycle progression, stem cell proliferation, and ribosome assembly. Drosophila melanogaster contains a four-member nucleostemin family (NS1-4). Nucleostemin 1 (NS1) is the closest orthologue to human NS; it shares 33% identity and 67% similarity with human NS. We show that NS1 has intrinsic GTPase and ATPase activity, and that it is present within nucleoli of most larval and adult cells. Endogenous NS1 and lightly expressed GFP-NS1 enrich within the nucleolar granular regions as expected, while over-expressed GFP-NS1 localizes throughout the nucleolus and nucleoplasm, and to several transcriptionally active inter-bands of polytene chromosomes. Over-expression caused melanotic tumors and larval and pupal lethality. RNAi depletion of NS1 caused a loss of imaginal (precursor) cells in the larval midgut, and an apparent block in the nucleolar release of large ribosomal subunits in the terminally differentiated larval midgut polyploid cells. Depletion of 60% of NS1 transcripts lead to larval and pupal lethality. Ultra-structural examination of highly differentiated larval Malpighian tubule cells depleted for NS1 showed a loss of cytoplasmic ribosomes with a concomitant appearance of cytoplasmic pre-autophagosomes. We interpret the appearance of these structures as indicators of cell stress response."],"dc:identifier":["etd-01232010-063910","10.31390/gradschool_dissertations.981","https://repository.lsu.edu/gradschool_dissertations/981"],"dc:rights":["unrestricted","Release the entire work immediately for access worldwide."],"dc:subject":["nucleostemin","ribosomes","large subunit","granular component","rRNA","nucleolus","NS-1","autophagy"],"dc:title":["Genetic and cytological investigation of Nucleostemin-1 in Drosophila melanogaster"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Doctor of Philosophy (PhD)"],"thesis:institution_name":["Biological Sciences"]},"updated_at":"2026-07-24T02:58:40Z"}