Crinkly-tail, a mild skeletal mutant in the mouse.

Area of Science:

• Developmental Biology
• Genetics
• Mouse Models

Background:

• The study investigates a novel mouse mutant, crinkly-tail (cy).
• Existing knowledge of mouse tail mutants is extensive, with over 20 known.
• The crinkly-tail mutation is located on chromosome 4 and exhibits recessive inheritance with imperfect penetrance.

Purpose of the Study:

• To characterize the genetic and developmental basis of the crinkly-tail mutation in mice.
• To understand the unique mechanisms underlying vertebral malformations in this mutant.
• To explore the potential role of primitive streak-derived tissue misallocation in the observed phenotype.

Main Methods:

• Genetic analysis to confirm the recessive nature and chromosomal location of the crinkly-tail mutation.
• Embryological examination of 11-day-old mouse embryos to observe early developmental defects.
• Comparative analysis with known mouse tail mutants to identify novel mechanisms.

Main Results:

• The crinkly-tail mutation results in abnormal vertebral shapes in one or two segments (C9-C14).
• Early embryonic expression involves a duplicated tail gut at 11 days.
• The observed defect does not align with the mechanisms of other known mouse tail mutants.

Conclusions:

• The crinkly-tail mutation represents a unique genetic defect in mouse tail development.
• The vertebral abnormalities are likely caused by misallocation of tissue originating from the primitive streak.
• This discovery expands our understanding of genetic control over axial skeletal development.