A clonal marker induced by mutation in mouse intestinal epithelium

Area of Science:

• Developmental Biology
• Genetics
• Cell Biology

Background:

• Investigating cell lineages and clonal organization in developing and renewing tissues requires cellular markers for individual somatic cells and their clonal descendants.
• Such markers are established in Drosophila but largely absent in mammalian tissues, except for specific cases like mutant melanocytes.

Purpose of the Study:

• To develop a mutation-induced cellular marker in mice for studying clonal organization and cell lineages.
• To demonstrate the utility of this marker in tracking clonal descendants during development and in adult tissues.

Main Methods:

• Induced a mutation at the Dlb-1 locus in mice heterozygous for the mutation.
• Utilized the mutation to create a marker based on altered expression of binding sites for Dolichos biflorus agglutinin (DBA) lectin in the intestinal epithelium.
• Applied the marker to study clonal organization in adult intestinal epithelium and trace developing clones.

Main Results:

• Successfully developed a mutation-induced marker in the intestinal epithelium of heterozygous mice.
• Demonstrated that the Dlb-1 locus marker can effectively track clonal organization in adult intestinal epithelium.
• Showed the marker's capability to identify descendant clones that arise during embryonic development.

Conclusions:

• A novel, mutation-induced cellular marker has been established for mammalian intestinal epithelium.
• This marker provides a valuable tool for investigating clonal dynamics during development and in adult tissues.
• The principle can be extended to other heterozygous markers, including those from transgenic animals.