Abstract
Combined lipase deficiency (cld) is a recessive, lethal mutation specific to the t w73 haplotype on mouse Chromosome 17. While the cld mutation results in lipase proteins that are inactive, aggregated, and retained in the endoplasmic reticulum (ER), it maps separately from the lipase structural genes. We have narrowed the gene critical region by about 50% using the t w18 haplotype for deletion mapping and a recombinant chromosome used originally to map cld with respect to the phenotypic marker tf. The region now extends from 22 to 25.6 Mbp on the wild-type chromosome, currently containing 149 genes and 50 expressed sequence tags (ESTs). To identify the affected gene, we have selected candidates based on their known role in associated biological processes, cellular components, and molecular functions that best fit with the predicted function of the cld gene. A secondary approach was based on differences in mRNA levels between mutant (cld/cld) and unaffected (+/cld) cells. Using both approaches, we have identified seven functional candidates with an ER localization and/or an involvement in protein maturation and folding that could explain the lipase deficiency, and six expression candidates that exhibit large differences in mRNA levels between mutant and unaffected cells. Significantly, two genes were found to be candidates with regard to both function and expression, thus emerging as the strongest candidates for cld. We discuss the implications of our mapping results and our selection of candidates with respect to other genes, deletions, and mutations occurring in the cld critical region.
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Acknowledgments
The authors thank Gail Martin for the kind gift of ES cells carrying the t w18 deletion, and Karen Artzt for sharing DNA from t-haplotype-specific mice. In particular, we are indebted to Karen Artzt for supplying DNA from a recombinant mouse derived from her original elegant studies that first identified the cld mutation, and her many helpful discussions and encouragement over the years. This work was funded by National Institutes of Health grant HL28481 and the Veterans Administration.
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Péterfy, M., Mao, H.Z. & Doolittle, M.H. The cld mutation: narrowing the critical chromosomal region and selecting candidate genes. Mamm Genome 17, 1013–1024 (2006). https://doi.org/10.1007/s00335-006-0045-3
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DOI: https://doi.org/10.1007/s00335-006-0045-3