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Lhx4, a LIM homeobox gene
T Yamashita1, K Moriyama, H Z Sheng
1Laboratory of Mammalian Genes and Development, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892-2790, USA.
Genomics
|August 15, 1997
Summary
The study details the LIM domains of the mouse Lhx4 gene, revealing high sequence identity with the Lhx3 gene. This research highlights conserved structures in LIM homeobox genes critical for embryonic development.
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- LIM homeobox genes are crucial transcriptional regulators in embryonic development.
- These genes are highly conserved across different species.
- Understanding their structure is key to deciphering developmental processes.
Purpose of the Study:
- To investigate the structure of the LIM domains of the mouse Lhx4 (Gsh4) gene.
- To compare the Lhx4 LIM domains with those of related genes, particularly Lhx3.
- To assess the conservation of the LIM consensus sequence within Lhx4.
Main Methods:
- Modified reverse transcription-PCR (RT-PCR) using degenerate consensus primers.
- Analysis of cDNA generated from mid-gestation mouse embryos.
- Deduction and comparison of amino acid sequences for LIM domains.
Main Results:
- The first LIM domain of Lhx4 shows 77% identity to Lhx3.
- The second LIM domain of Lhx4 shows 86% identity to Lhx3.
- Lhx4 exhibits 38-56% similarity to other LIM homeobox gene family members.
- The LIM consensus sequence is well conserved in Lhx4.
Conclusions:
- The LIM domains of mouse Lhx4 are highly similar to those of Lhx3, indicating a close evolutionary relationship.
- The conserved nature of the LIM consensus sequence in Lhx4 underscores its functional importance.
- These findings contribute to the understanding of LIM homeobox gene function in embryonic development.