Multilocus mapping of the X-linked hypophosphatemic rickets gene - PubMed (original) (raw)

Multilocus mapping of the X-linked hypophosphatemic rickets gene

M J Econs et al. J Clin Endocrinol Metab. 1992 Jul.

Abstract

X-linked hypophosphatemic rickets (HYP), the most common form of familial hypophosphatemic (vitamin D-resistant) rickets, is an X-linked dominant disorder characterized by decreased renal tubular phosphate reabsorption and consequent hypophosphatemia. Despite the application of a wide variety of biochemical and cell biology techniques, controversy exists regarding whether a primary renal abnormality underlies the abnormal phosphate transport or if this defect is secondary to the effects of a hormonal/metabolic factor. Thus localization of the HYP gene and its ultimate cloning may be necessary to elucidate the pathophysiology of the disorder. In order to map the human HYP gene we investigated several new polymorphic probes for linkage to HYP and constructed a map of markers around the gene. The database used to ascertain linkage and perform mapping included 5 large HYP kindreds, 40 Centre d'Etudie Polymorphisms Humain reference pedigrees, and 19 kindreds which had been obtained for other disease linkage studies. Two point LOD scores (odds of linkage, log10) indicate that the probes DXS365, DXS257, DXS451, and DXS41 are tightly linked to the HYP locus. Indeed, there were no cross-overs between DXS365 and HYP with a peak LOD score of 13.98 [recombination fraction (theta) = 0.00]. Moreover, multipoint analysis reveals a probable locus order of: Xtel-DXS315-DXS43-DXS257-HYP-DXS41-DXS4 51-Xcen. The likelihood of HYP occurring between DXS257 and DXS41 is 407:1 over the next most likely position. DXS365 is located between DXS41 and DXS43 but could not be located with respect to HYP and DXS257. Regardless, we have located the HYP gene between the flanking markers DXS257 (telomeric) and DXS41 (centromeric) which are 3.5 centiMorgans apart. Thus, the results of this study will facilitate attempts to further localize and eventually clone the gene.

PubMed Disclaimer

Cited by

Autosomal dominant hypophosphatemic rickets is linked to chromosome 12p13.
Econs MJ, McEnery PT, Lennon F, Speer MC. Econs MJ, et al. J Clin Invest. 1997 Dec 1;100(11):2653-7. doi: 10.1172/JCI119809. J Clin Invest. 1997. PMID: 9389727 Free PMC article.
Mutational analysis of the PEX gene in patients with X-linked hypophosphatemic rickets.
Holm IA, Huang X, Kunkel LM. Holm IA, et al. Am J Hum Genet. 1997 Apr;60(4):790-7. Am J Hum Genet. 1997. PMID: 9106524 Free PMC article.
Refining the genetic map for the region flanking the X-linked hypophosphataemic rickets locus (Xp22.1-22.2).
Rowe PS, Goulding J, Read A, Lehrach H, Francis F, Hanauer A, Oudet C, Biancalana V, Kooh SW, Davies KE, et al. Rowe PS, et al. Hum Genet. 1994 Mar;93(3):291-4. doi: 10.1007/BF00212025. Hum Genet. 1994. PMID: 8125480
Renal Na(+)-phosphate cotransport in murine X-linked hypophosphatemic rickets. Molecular characterization.
Tenenhouse HS, Werner A, Biber J, Ma S, Martel J, Roy S, Murer H. Tenenhouse HS, et al. J Clin Invest. 1994 Feb;93(2):671-6. doi: 10.1172/JCI117019. J Clin Invest. 1994. PMID: 8113402 Free PMC article.
New markers for linkage analysis of X-linked hypophosphataemic rickets.
Rowe PS, Goulding J, Read A, Mountford R, Hanauer A, Oudet C, Whyte MP, Meier-Ewert S, Lehrach H, Davies KE, et al. Rowe PS, et al. Hum Genet. 1993 Jul;91(6):571-5. doi: 10.1007/BF00205082. Hum Genet. 1993. PMID: 8101831

Multilocus mapping of the X-linked hypophosphatemic rickets gene - PubMed (original) (raw)