Generation of an 870 kb deletion encompassing the Skt/Etl4 locus by combination of inter- and intra-chromosomal recombination.

Abstract:

BACKGROUND:Etl4(lacZ) (Enhancer trap locus 4) and Skt(Gt) (Sickle tail) are lacZ reporter gene integrations into the same locus on mouse chromosome 2 targeting a gene that is expressed in the notochord of early embryos and in multiple epithelia during later development. Both insertions caused recessive mutations that resulted exclusively in mild defects in the caudal vertebral column. Since notochord-derived signals are essential for formation of the vertebral column the phenotypes suggested that the lacZ insertions interfered with some notochord-dependent aspect of vertebral development. As both insertions occurred in introns it was unclear whether they represent hypomorphic alleles or abolish gene function. Here, we have generated a definitive null allele of the Skt/Etl4 gene and analysed homozygous mutants. RESULTS:We have introduced loxP sites into three positions of the gene based on additional upstream exons that we identified, and deleted approximately 870 kb of the locus by a combination of inter- and intra-chromosomal Cre-mediated recombinations in the female germ line of mice. This deletion removes about 90 % of the coding region and results in the loss of the SKT/ETL4 protein. Similar to the Etl4(lacZ) and Skt(Gt) alleles our deletion mutants are viable and fertile and show only mild defects in caudal vertebrae due to abnormal intervertebral disc development, although with higher penetrance. No other tissue with Skt/Etl4 expression that we analysed showed obvious defects. CONCLUSION:The complete loss of Skt/Etl4 function affects only development of caudal notochord derivatives and is compensated for in its other expression domains.

journal_name

BMC Genet

journal_title

BMC genetics

authors

Serth K,Beckers A,Schuster-Gossler K,Pavlova MN,Müller J,Paul MC,Reinhardt R,Gossler A

doi

10.1186/s12863-015-0302-0

subject

Has Abstract

pub_date

2015-12-18 00:00:00

pages

143

issn

1471-2156

pii

10.1186/s12863-015-0302-0

journal_volume

16

pub_type

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