Monito del Monte Development

Embryology - 14 Jun 2024 Expand to Translate
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Introduction

Monito del monte (Dromiciops gliroides) are small South American marsupials representatives of the ancient order Microbiotheria

Monito del monte (Spanish = "little mountain monkey") or colocolo opossum.

Links: Category:Marsupial

Some Recent Findings

Comparative gene expression analyses reveal heterochrony for Sox9 expression in the cranial neural crest during marsupial development^[1] "Compared to placental mammals, marsupials have short gestation period, and their neonates are relatively immature. Despite these features, marsupial neonates must travel from the birth canal to the teat, suckle and digest milk to complete development. Thus, certain organs and tissues of marsupial neonates, such as forelimbs to crawl and jaw elements to suckle, must develop early. Previous reports showed that cranial neural crest (CNC) cells, as the source of ectomesenchyme of jaw elements, are generated significantly early in gray short-tailed opossum (Monodelphis domestica) compared to other amniote models, such as mouse. In this study, we examined the expression of genes known to be important for neural crest formation, such as BMP2/BMP4 (neural crest inducer), Pax7 (neural border specifier), Snail1 and Sox9/Sox10 (neural crest specifier) in Monodelphis domestica, and compared the expression patterns with those in mouse, chicken, and gecko embryos. Among those genes, the expression of Sox9 was turned on early and broadly in the premigratory CNC cells, and persisted in the ectomesenchyme of the cranial anlagen in opossum embryos. In contrast, Sox9 expression diminished in the CNC cells of other animals at the early phase of migration. Comparison of the onset of Pax7 and Sox9 expression revealed that Sox9 expression in the prospective CNC was earlier and broader than Pax7 expression in opossum, suggesting that the sequence of border specification and neural crest specification is altered."

More recent papers
This table allows an automated computer search of the external PubMed database using the listed "Search term" text link. This search now requires a manual link as the original PubMed extension has been disabled. The displayed list of references do not reflect any editorial selection of material based on content or relevance. References also appear on this list based upon the date of the actual page viewing. References listed on the rest of the content page and the associated discussion page (listed under the publication year sub-headings) do include some editorial selection based upon both relevance and availability. More? References \| Discussion Page \| Journal Searches \| 2019 References \| 2020 References Search term: Monito del monte Embryology <pubmed limit=5>Monito del monte Embryology</pubmed> <pubmed limit=5>Dromiciops gliroides Embryology</pubmed>

Taxon

Taxonomy ID:

Genbank common name: opossum

Rank: species

Genetic code: Translation table 1 (Standard)

Mitochondrial genetic code: Translation table 2 (Vertebrate Mitochondrial)

Lineage ( full )

Links: Taxonomy Browser Phalangeridae

Development Overview

System Development

The marsupial neonate at birth has a variation between the degree of development of different systems.^[2]

well-developed - digestive, respiratory and circulatory system.
not well-developed - retains fetal excretory system with a fully functional mesonephric kidney and undifferentiated gonads and genitalia.

Oocyte

Ovarian Follicle Development

Marsupial eggs are enclosed by a series of layers:^[3]

zona pellucida, three zona proteins (ZPA, ZPB, ZPC)
- - an additional extracellular matrix coat that lines the zona pellucida also occurs in some species.
mucoid coat
outer shell coat.

Links: Oocyte Development

Spermatozoa

Links: Spermatozoa Development

References

↑ <pubmed>24934187</pubmed>
↑ <pubmed>11999321</pubmed>
↑ <pubmed>10729728</pubmed>

Reviews

Articles

Books

Search PubMed

Search PubMed: Monito del monte development | Dromiciops gliroides

External Links

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Cite this page: Hill, M.A. (2024, June 14) Embryology Monito del Monte Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Monito_del_Monte_Development

What Links Here?

[PMID24934187-1] <pubmed>24934187</pubmed>

[2] <pubmed>11999321</pubmed>

[3] <pubmed>10729728</pubmed>

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