Abstract:
:Nuclear egress, also referred to as nuclear envelope (NE) budding, is a process of transport in which vesicles containing molecular complexes or viral particles leave the nucleus through budding from the inner nuclear membrane (INM) to enter the perinuclear space. Following this event, the perinuclear vesicles (PNVs) fuse with the outer nuclear membrane (ONM), where they release their contents into the cytoplasm. Nuclear egress is thought to participate in many functions such as viral replication, cellular differentiation, and synaptic development. The molecular basis for nuclear egress is now beginning to be elucidated. Here, we observe in the sea urchin gastrula, using serial section transmission electron microscopy, strikingly abundant PNVs containing as yet unidentified granules that resemble the ribonucleoprotein complexes (RNPs) previously observed in similar types of PNVs. Some PNVs were observed in the process of fusion with the ONM where they appeared to release their contents into the cytoplasm. These vesicles were abundantly observed in all three presumptive germ layers. These findings indicate that nuclear egress is likely to be an important mechanism for nucleocytoplasmic transfer during sea urchin development. The sea urchin may be a useful model to characterize further and gain a better understanding of the process of nuclear egress.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
LaMassa N,Arenas-Mena C,Phillips GRdoi
10.1002/jmor.20796subject
Has Abstractpub_date
2018-05-01 00:00:00pages
609-615issue
5eissn
0362-2525issn
1097-4687journal_volume
279pub_type
杂志文章abstract::The innervation of the musculature of the tongue and the hyobranchial apparatus of caecilians has long been assumed to be simple and to exhibit little interspecific variation. A study of 14 genera representing all six families of caecilians demonstrates that general patterns of innervation by the trigeminal, facial, g...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052120105
更新日期:1992-04-01 00:00:00
abstract::In Japan Pseudopythina tsurumaru is an up to 10.8 mm-long commensal of the burrowing sea cucumber Protankyra bidentata, whereas in Hong Kong the same species is smaller and associated with the crab Hexapus anfractus, itself a commensal of P. bidentata. Japanese P. tsurumaru is a hermaphrodite tending towards protogyny...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10158
更新日期:2004-10-01 00:00:00
abstract::We provide a detailed description of the larval morphology of the Great Basin spadefoot toad (Scaphiopus intermontanus), a species with documented morphological variability in larval structures associated with feeding. We based our findings on laboratory-raised individuals fed a herbivorous diet. We characterized the ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1094
更新日期:2002-05-01 00:00:00
abstract::One of the main characters used in acoel taxonomy is the male copulatory organ. Despite this, ultrastructural studies of this structure are scarce. We studied the ultrastructure of the copulatory organ in eight species of acoels belonging to the taxon Childia. Members of Childia possess a well-developed conical or cyl...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10502
更新日期:2007-02-01 00:00:00
abstract::Development of the yolk sac of squamate reptiles (lizards and snakes) differs from other amniote lineages in the pattern of growth of extraembryonic mesoderm, which produces a cavity, the yolk cleft, within the yolk. The structure of the yolk cleft and the accompanying isolated yolk mass influence development of the a...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20052
更新日期:2012-10-01 00:00:00
abstract::From the elongated neck of the giraffe to the elaborate train of the peacock, extreme traits can result from natural or sexual selection (or both). The extreme chelicerae of the long-jawed spiders (Tetragnatha) present a puzzle: do these exaggerated chelicerae function as weapons or genitalia? Bristowe first proposed ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.21282
更新日期:2020-10-19 00:00:00
abstract::Growth dynamics of the primary spine of the cidaroid sea urchin Phyllacanthus imperialis was assessed for the first time using pulsed (26) Mg-labeling and NanoSIMS isotopic imaging. The sea urchin was incubated twice (for 48 h) in artificial seawater with elevated level of (26) Mg. After each labeling event, the sea u...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20260
更新日期:2014-07-01 00:00:00
abstract::Barnacle cypris larvae show high morphological variation in the organs used in search of and attaching to a substratum. This variation may represent adaptation to the habitat of the species. Here, we studied SEM level morphologies of cypris antennular sensory and attachment organs in a deep-sea vent endemic species (N...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20522
更新日期:2016-05-01 00:00:00
abstract::The usual pigmentation pattern in mammalian skin consists of fixed melanocytes in the basal layer of the epidermis, supplying keratinocytes with melanosomes. We observed that the glabrous skin (rhinaria and footpads) of dogs deviates from this pattern. In dogs, melanocytes are found in both the dermis and epidermis. T...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20842
更新日期:2018-08-01 00:00:00
abstract::Electron microscopy of spermatogenesis in the Hawaiian red lobster, Enoplometopus occidentalis (Randall), has revealed unusual activity within membranous organelles. Mitochondria-like bodies (MLB-1) seen first in spermatogonia appear in primary spermatocytes to swell and fuse as the cytoplasm develops annulate lamella...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051900108
更新日期:1986-10-01 00:00:00
abstract::The posterior half of the channel catfish intestine has a similar histological organization to that of other teleost fishes. This region is organized into a muscosa, a submucosa, a double layered muscularis and a serosa. A "stratum compactum" of dense connective tissue was confirmed for the submucosa. In its histology...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051450405
更新日期:1975-04-01 00:00:00
abstract::The surface of a mature, pelagic C-O sole egg is composed of polygonal chambers having four to eight sides, most of which are hexagonally shaped. This honeycomb pattern initially appears on primary oocytes as a thin layer of compact, electron-dense material. Discrete thickenings begin to develop on the envelope of per...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051780305
更新日期:1983-12-01 00:00:00
abstract::The ventral surface of the most proximal tarsomere of each mesothoracic leg of the female black fly, Simulium venustum Say, bears approximately 60 bifurcate sensilla. Externally, a sensillum appears as a hair set into an asymmetric socket and with the distal tip flattened into two flared lobes. A single pore opens int...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051650102
更新日期:1980-07-01 00:00:00
abstract::Exceptional variability in the shell of the pancake tortoise Malacochersus tornieri, both in the keratinous surficial scutes and the underlying bones, in addition to its remarkably fenestrated bony shell are unique among tortoises. Based on 14 individuals of different sizes and ages, the observed variation in M. torni...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20640
更新日期:2017-03-01 00:00:00
abstract::The laterophysic connection (LC) is an association between bilaterally paired, anterior swim bladder extensions (horns) and medial openings in the supracleithral lateral line canals that diagnoses butterflyfishes in the genus Chaetodon. It has been hypothesized that the LC makes the lateral line system sensitive to so...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10480
更新日期:2006-11-01 00:00:00
abstract::Osmotically induced alterations in the ultrastructure of the apical crypts of chloride cells and changes in chloride efflux were studied in striped bass (Morone saxatilis). Striped bass were divided into three groups: fish adapted to freshwater, fish transferred directly from freshwater to 100% seawater (3% salt, w/v)...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052090204
更新日期:1991-08-01 00:00:00
abstract::Liolaemus elongatus (Liolaemidae) is a viviparous, mainly lecithotrophic species with placental structures specialized for uptake of oxygen and inorganic nutrient transport. An allantoplacenta and an omphaloplacenta are present during early embryonic stages (25-28) and there is a moderate distension of the uterine wal...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10632
更新日期:2008-07-01 00:00:00
abstract::The process of coelomic pouch formation in Pisaster ochraceus was studied with light microscopy, transmission and scanning electron microscopy and time-lapse cinemicrography as well as with the drug cytochalasin B. As in most asteroids, the paired coelomic pouches of Pisaster ochraceus are formed from outpocketing of ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051570107
更新日期:1978-07-01 00:00:00
abstract::Fine structural changes in mitochondrial morphology pertaining to size, number and growth were examined in flight muscles of normal and experimentally dewinged male Drosophila melanogaster ranging up to 26 days of age. In the normal winged flies, the number of mitochondria decreases during the first week of adult lif...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051450307
更新日期:1975-03-01 00:00:00
abstract::Reproduction was studied in a South Carolina population of the paedomorphic salamander Siren intermedia with emphasis on anatomy of the female oviduct. The oviduct forms 67-79% of the snout-vent length in this elongate species and can be divided into three portions. The atrium, 7-13% of oviducal length, is the narrow ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4687(199603)227:3<335::AID-JMOR
更新日期:1996-03-01 00:00:00
abstract::A morphological and cytometric analysis of the adult fat body cells and oenocytes was made on sections of abdomens from immature, mature and senescent Drosophila melanogaster of both sexes. There are about 18,000 fat body cells in abdomens of female and mature male flies. Immature and senescent males have about 12,000...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051840106
更新日期:1985-04-01 00:00:00
abstract::The chimaeroid holocephalian fishes are distinguished among extant chondrichthyans by the possession of three pairs of tooth plates, evergrowing and partially hypermineralized, that are not shed and replaced like the teeth of living elasmobranchs. Although derivation of the chimaeroid tooth plate from the fusion of me...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1052220108
更新日期:1994-10-01 00:00:00
abstract::In the Mexican axolotl (Ambystoma mexicanum), the pronephros begins to form at the four-somite stage. It is initially continuous with the posterior-lateral region of somite 2 and the lateral margin of somites 3 and 4. By the seven-somite stage, the pronephros has become compacted, and the cells are now morphologically...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.1051850207
更新日期:1985-08-01 00:00:00
abstract::Formation of the first epidermal layers in the embryonic scales of the lizard Lampropholis guichenoti was studied by optical and electron microscopy. Morphogenesis of embryonic scales is similar to the general process in lizards, with well-developed overlapping scales being differentiated before hatching. The narrow o...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4687(199908)241:2<139::AID-JMOR
更新日期:1999-08-01 00:00:00
abstract::Slender blindsnakes (Leptotyphlopidae) are known to use a unique feeding mechanism that involves rapid flexions of the tooth-bearing lower jaw. However, the morphology of the leptotyphlopid jaw apparatus has remained poorly studied due to the extremely small size of these snakes. Here I present a detailed description ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10414
更新日期:2006-04-01 00:00:00
abstract::Six locomotory muscles of wild common coots, Fulica atra, were analyzed histochemically. Capillarity and fiber-type distributions were correlated to the functional implications and physiological needs of each muscle. Leg muscles exhibit three unevenly distributed fiber types, a pattern that reflects the great variety ...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/(SICI)1097-4687(199808)237:2<147::AID-JMOR
更新日期:1998-08-01 00:00:00
abstract::The structural organization of the spermatozoon from the Eurasian beaver, Castor fiber (Family: Castoridae), was determined and compared to that of other sciuromorph rodents. The beaver spermatozoon has a head, which is variable in form but usually paddle-shaped, with a small nucleus and very large acrosome, and a tai...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.10544
更新日期:2007-08-01 00:00:00
abstract::Morphology is strongly correlated with trophic mode in marine invertebrate larvae. We asked if larval morphogenesis is influenced by adelphophagy, a trophic mode in which larvae are provisioned with additional yolk in the form of extra-embryonic nurse eggs, instead of the more common increase in egg size. We used hist...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20071
更新日期:2013-01-01 00:00:00
abstract::The orientation of the semicircular canals of the inner ear in the skull of vertebrates is one of the determinants of the capacity of this system to detect a given rotational movement of the head. Past functional studies on the spatial orientation of the semicircular canals essentially focused on the lateral semicircu...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20665
更新日期:2017-05-01 00:00:00
abstract::The aim of this work was to study the postnatal ontogenetic development of Pontoporia blainvillei skull, identifying major changes on shape, and relating them to relevant factors in the life history of the species. We analyzed a complete ontogenetic series (73♂, 83♀) with three-dimensional geometric morphometric techn...
journal_title:Journal of morphology
pub_type: 杂志文章
doi:10.1002/jmor.20309
更新日期:2014-12-01 00:00:00