Related Experiment Video
Updated: Aug 3, 2026
14:40
Expression Analysis of Mammalian Linker-histone Subtypes
Published on: March 19, 2012
Developmental expression of H3.3A variant histone mRNA in mouse
L A López-Fernández1, D M López-Alañón, V Castañeda
1Centre de Biochimie, INSERM (U470), U. de Nice, France.
The International Journal of Developmental Biology
|February 12, 1998
Summary
Histone H3.3A variant expression is linked to meiotic development in mice. Its varied expression across tissues suggests a role in cell differentiation during development.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- Histone variants play crucial roles in DNA-templated processes, including development and differentiation.
- The H3.3A histone variant has been recently associated with meiotic progression in mouse reproductive tissues.
Purpose of the Study:
- To investigate the expression patterns of the H3.3A histone variant in various mouse tissues during development.
- To explore the potential functional significance of H3.3A expression in cell differentiation.
Main Methods:
- Northern blot analysis was employed to determine H3.3A mRNA levels.
- In situ hybridization was used to visualize H3.3A expression within tissue structures.
Main Results:
- H3.3A exhibits differential expression during male and female meiosis.
- High H3.3A expression was observed in adult ovarian preantral follicles and spermatogonia within the seminiferous epithelium.
- Distinct expression profiles were noted in somatic tissues, with high levels in fetal liver and spinal cord, and low levels in adult skeletal muscle.
Conclusions:
- The diverse expression patterns of H3.3A across different tissues and developmental stages suggest a role beyond meiosis.
- H3.3A may be involved in cell differentiation processes, as indicated by its expression in specific cell types and tissues like MEL cells.
Related Concept Videos
02:32Position-effect Variegation
In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
02:30Histone Variants at the Centromere
Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3 variants are also...
01:01Euchromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
02:38Heterochromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...