High-density single nucleotide polymorphism screen in a large multiplex neural tube defect family refines linkage to loci at 7p21.1-pter and 2q33.1-q35

Demetra S. Stamm, Evadnie Rampersaud, Susan H. Slifer, Lorraine Mehltretter, Deborah G. Siegel, Jianzhen Xie, Diane Hu-Lince, David W. Craig, Dietrich A. Stephan, Timothy M. George, John R. Gilbert, Marcy C. Speer*, Joanna Aben, Arthur Aylsworth, Cynthia Powell, Joanne Mackey, Gordon Worley, Timothy Brei, Connie Buran, Joann BodurthaKathleen Sawin, Philip Mack, Elli Meeropol, Nicole Lasarsky, David McLone, Joy Ito, W. Jerry Oakes, Marion Walker, Bermans Iskandar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


BACKGROUND: Neural tube defects (NTDs) are considered complex, with both genetic and environmental factors implicated. To date, no major causative genes have been identified in humans despite several investigations. The first genomewide screen in NTDs demonstrated evidence of linkage to chromosomes 7 and 10. This screen included 44 multiplex families and consisted of 402 microsatellite markers spaced ∼10 cM apart. Further investigation of the genomic screen data identified a single large multiplex family, pedigree 8776, as primarily driving the linkage results on chromosome 7. METHODS: To investigate this family more thoroughly, a high-density single nucleotide polymorphism (SNP) screen was performed. Two-point and multipoint linkage analyses were performed using both parametric and nonparametric methods. RESULTS: For both the microsatellite and SNP markers, linkage analysis suggested the involvement of a locus or loci proximal to the telomeric regions of chromosomes 2q and 7p, with both regions generating a LOD* score of ∼3.0 using a nonparametric identity by descent relative sharing method. CONCLUSIONS: The regions with the strongest evidence for linkage map proximal to the telomeres on these two chromosomes. In addition to mutations and/or variants in a major gene, these loci may harbor a microdeletion and/or translocation; potentially, polygenic factors may also be involved. This single family may be promising for narrowing the search for NTD susceptibility genes.

Original languageEnglish (US)
Pages (from-to)499-505
Number of pages7
JournalBirth Defects Research Part A - Clinical and Molecular Teratology
Issue number6
StatePublished - Jun 2006


  • Genetic mapping
  • Genome screen
  • Linkage
  • NTDs
  • Neural tube defects
  • Spina bifida

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Embryology
  • Developmental Biology


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