Nuclear factor I X deficiency causes brain malformation and severe skeletal defects
Katrin Driller1, Axel Pagenstecher, Markus Uhl
1Institut für Biologie III, Fakultät für Biologie, Albert-Ludwigs Universität Freiburg, Schänzlestrasse 1, D-79104 Freiburg, Germany.
Molecular and Cellular Biology
|March 14, 2007
Summary
Nuclear Factor I-X (NFIX) deficiency causes postnatal lethality, hydrocephalus, and skeletal defects in mice. NFIX is crucial for bone ossification and intervertebral disk development.
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- The nuclear factor I (NFI) family, comprising NFIA, NFIB, NFIC, and NFIX, plays roles in development.
- Previous studies linked NFIA, NFIB, and NFIC deficiencies to specific developmental defects.
Purpose of the Study:
- To investigate the function of the NFIX gene by analyzing knockout mice.
- To elucidate the role of NFIX in embryonic and postnatal development.
Main Methods:
- Generation and analysis of Nfix knockout mice.
- Phenotypic characterization including skeletal and neurological assessments.
- Gene expression analysis of bone tissue.
Main Results:
- Nfix deficiency results in postnatal lethality, hydrocephalus, and partial agenesis of the corpus callosum.
- NFIX-deficient mice exhibit spinal deformities due to delayed ossification and intervertebral disk degeneration.
- Impaired endochondral ossification and reduced bone mineralization were observed, with downregulation of tetranectin expression.
Conclusions:
- NFIX is essential for normal postnatal development, particularly skeletal ossification and intervertebral disk integrity.
- NFIX influences mineralization processes, potentially through regulating genes like tetranectin.
- NFIX plays a critical role in the NFI family's contribution to mammalian development.
More Related Videos
Related Concept Videos
01:30Neurulation
Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three primary cell layers of the embryo: ectoderm, mesoderm, and endoderm. In humans, the majority of this system is formed via primary neurulation, in which the central portion of the ectoderm—originally appearing as a flat sheet of cells—folds upwards and inwards, sealing off to form a hollow neural tube. As development proceeds, the anterior...
01:49Meiosis I
Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by a...
01:43Sex-linked Disorders
Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
02:54Nucleosome Remodeling
Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
01:07Teratogenicity
The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
01:33Pleiotropy
Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...