Related Experiment Videos
Developmental characteristics of trisomy 19 mice
1Abteilung für Neuroanatomie, Universitätskrankenhaus Eppendorf, Hamburg, BRD.
Acta Anatomica
|January 1, 1994
Summary
Trisomy 19 (Ts19) in mice causes developmental delays and reduced body weight, impacting multiple organ systems. Despite some normal cellular patterns, neurogenesis and behavior are affected, with variable effects on reproductive development.
Area of Science:
- Developmental Biology
- Genetics
- Animal Models
Background:
- Trisomy 19 (Ts19) is the only known murine trisomy compatible with postnatal survival.
- This model allows for systematic investigation of the effects of an extra chromosome on development.
Purpose of the Study:
- To review and present the developmental consequences of murine Ts19.
- To analyze the impact of Ts19 on various organ systems, CNS development, behavior, and reproductive health.
Main Methods:
- Review of existing literature on Ts19 mouse models.
- Analysis of morphological, morphometric, biochemical, and behavioral data from Ts19 mice.
- Histopathological examination of organ systems, including the CNS and reproductive organs.
Main Results:
- Ts19 mice exhibit reduced viability, limited to a few weeks postpartum, and markedly reduced body weight.
- Developmental delays of 1-2 days are observed across organ systems, with variable malformations in cardiovascular, skeletal, and CNS.
- CNS studies show delayed neurogenesis, gliogenesis, myelination, and vascularization, with region-specific hypoplasia and altered neurotransmitter enzyme activities.
- Behavioral tests reveal delayed visual and orientation abilities, retarded motor coordination, and lack of auditory response.
- Reproductive development is severely affected, with oocyte degeneration in females and disrupted spermatogenesis in males, leading to reduced germ cell numbers.
- Biochemical analyses show gene dosage effects for specific enzymes and altered ganglioside composition in the liver.
Conclusions:
- Murine Ts19 causes significant postnatal developmental deficits, including growth retardation, delayed maturation, and functional impairments across multiple systems.
- The CNS is affected by delays in developmental processes and region-specific hypoplasia, impacting behavior.
- Reproductive systems are profoundly affected, suggesting Ts19 is detrimental to gametogenesis.
- The study highlights the complex and variable effects of aneuploidy on mammalian development, with potential insights into gene dosage and pathogenetic mechanisms.