title: High-resolution landmark framework for the sequence-ready mapping of Xq23-q26.1.
abstract: We have established a landmark framework map over 20-25 Mb of the long arm of the human X chromosome using yeast artificial chromosome (YAC) clones. The map has approximately one landmark per 45 kb of DNA and stretches from DXS7531 in proximal Xq23 to DXS895 in proximal Xq26, connecting to published framework maps on its proximal and distal sides. There are three gaps in the framework map resulting from the failure to obtain clone coverage from the YAC resources available. Estimates of the maximum sizes of these gaps have been obtained. The four YAC contigs have been positioned and oriented using somatic-cell hybrids and fluorescence in situ hybridization, and the largest is estimated to cover approximately 15 Mb of DNA. The framework map is being used to assemble a sequence-ready map in large-insert bacterial clones, as part of an international effort to complete the sequence of the X chromosome. PAC and BAC contigs currently cover 18 Mb of the region, and from these, 12 Mb of finished sequence is available.
authors.affiliation: The Sanger Centre, Wellcome Trust Genome Campus, Hinxton, UK.
authors.forename: H E
authors.initials: HE
authors.lastname: Steingruber
authors.forename: A
authors.initials: A
authors.lastname: Dunham
authors.forename: A J
authors.initials: AJ
authors.lastname: Coffey
authors.forename: S M
authors.initials: SM
authors.lastname: Clegg
authors.forename: G R
authors.initials: GR
authors.lastname: Howell
authors.forename: G L
authors.initials: GL
authors.lastname: Maslen
authors.forename: C E
authors.initials: CE
authors.lastname: Scott
authors.forename: R
authors.initials: R
authors.lastname: Gwilliam
authors.forename: P J
authors.initials: PJ
authors.lastname: Hunt
authors.forename: E C
authors.initials: EC
authors.lastname: Sotheran
authors.forename: E J
authors.initials: EJ
authors.lastname: Huckle
authors.forename: S E
authors.initials: SE
authors.lastname: Hunt
authors.forename: P
authors.initials: P
authors.lastname: Dhami
authors.forename: C
authors.initials: C
authors.lastname: Soderlund
authors.forename: M A
authors.initials: MA
authors.lastname: Leversha
authors.forename: D R
authors.initials: DR
authors.lastname: Bentley
authors.forename: M T
authors.initials: MT
authors.lastname: Ross
mesh_terms: D015139:Blotting, Southern; D002874:Chromosome Mapping / Q000379:methods*; D018244:Chromosomes, Artificial, Yeast / Q000235:genetics; D020451:Contig Mapping; D016521:Electrophoresis, Gel, Pulsed-Field; D005260:Female; D005819:Genetic Markers / Q000235:genetics; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D017422:Sequence Analysis, DNA; D014960:X Chromosome / Q000235:genetics*
chemical_list: D005819:Genetic Markers