Abstract:
:A gene for the autosomal recessive kidney disorder juvenile nephronophthisis (NPH) is located on chromosome 2q between markers D2S1893 and D2S1888. Recently, the presence of large homozygous deletions was described in the majority of NPH patients. We constructed an integrated YAC/PAC contig of 54 markers and 30 PAC clones that encompasses this deletion and the flanking inverted duplication. Thirty-six novel sequence-tagged site markers were generated for this region of 2-3 Mb, 22 of which represent PAC ends. Ten of 18 multiplex NPH families show a homozygous deletion for 8 consecutive markers. BlastN database search and expressed sequence tag (EST) mapping led to the localization of 18 EST clones to the integrated contig, representing 11 putative transcribed sequences. Seven EST clones were localized to the NPHP1 region between D2S1893 and D2S1888. Two EST clones, zc07a11 from a human parathyroid tumor library and yy63e10 from a multiple sclerosis lesion library, are located in the deletion region. PCR amplification experiments indicate that zc07a11 represents a chimeric cDNA. Through FISH analysis the NPHP1 deletion region was localized to 2q12-q13. In summary, our study provides a high-resolution physical map of the NPHP1 region with 7 precisely localized expressed sequences, 2 of which have recently been shown to be part of a gene for NPH. These data will alleviate the identification of further genes of a homozygous gene deletion syndrome in patients with NPH and oculomotor apraxia and will be instrumental in the characterization of the molecular mechanism leading to the large homozygous deletion in this region. The data furthermore provide an important step toward the construction of a sequence-ready PAC contig of this region.
journal_name
Genomicsjournal_title
Genomicsauthors
Nothwang HG,Stubanus M,Adolphs J,Hanusch H,Vossmerbäumer U,Denich D,Kübler M,Mincheva A,Lichter P,Hildebrandt Fdoi
10.1006/geno.1997.5102subject
Has Abstractpub_date
1998-01-15 00:00:00pages
276-85issue
2eissn
0888-7543issn
1089-8646pii
S0888-7543(97)95102-8journal_volume
47pub_type
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