FIGURE 2. Xp and Xq pericentromeric contigs extend into the X-chromosome-specific higher-order alpha satellite, DXZ1.

From the following article:

The DNA sequence of the human X chromosome

Mark T. Ross, Darren V. Grafham, Alison J. Coffey, Steven Scherer, Kirsten McLay, Donna Muzny, Matthias Platzer, Gareth R. Howell, Christine Burrows, Christine P. Bird, Adam Frankish, Frances L. Lovell, Kevin L. Howe, Jennifer L. Ashurst, Robert S. Fulton, Ralf Sudbrak, Gaiping Wen, Matthew C. Jones, Matthew E. Hurles, T. Daniel Andrews, Carol E. Scott, Stephen Searle, Juliane Ramser, Adam Whittaker, Rebecca Deadman, Nigel P. Carter, Sarah E. Hunt, Rui Chen, Andrew Cree, Preethi Gunaratne, Paul Havlak, Anne Hodgson, Michael L. Metzker, Stephen Richards, Graham Scott, David Steffen, Erica Sodergren, David A. Wheeler, Kim C. Worley, Rachael Ainscough, Kerrie D. Ambrose, M. Ali Ansari-Lari, Swaroop Aradhya, Robert I. S. Ashwell, Anne K. Babbage, Claire L. Bagguley, Andrea Ballabio, Ruby Banerjee, Gary E. Barker, Karen F. Barlow, Ian P. Barrett, Karen N. Bates, David M. Beare, Helen Beasley, Oliver Beasley, Alfred Beck, Graeme Bethel, Karin Blechschmidt, Nicola Brady, Sarah Bray-Allen, Anne M. Bridgeman, Andrew J. Brown, Mary J. Brown, David Bonnin, Elspeth A. Bruford, Christian Buhay, Paula Burch, Deborah Burford, Joanne Burgess, Wayne Burrill, John Burton, Jackie M. Bye, Carol Carder, Laura Carrel, Joseph Chako, Joanne C. Chapman, Dean Chavez, Ellson Chen, Guan Chen, Yuan Chen, Zhijian Chen, Craig Chinault, Alfredo Ciccodicola, Sue Y. Clark, Graham Clarke, Chris M. Clee, Sheila Clegg, Kerstin Clerc-Blankenburg, Karen Clifford, Vicky Cobley, Charlotte G. Cole, Jen S. Conquer, Nicole Corby, Richard E. Connor, Robert David, Joy Davies, Clay Davis, John Davis, Oliver Delgado, Denise DeShazo, Pawandeep Dhami, Yan Ding, Huyen Dinh, Steve Dodsworth, Heather Draper, Shannon Dugan-Rocha, Andrew Dunham, Matthew Dunn, K. James Durbin, Ireena Dutta, Tamsin Eades, Matthew Ellwood, Alexandra Emery-Cohen, Helen Errington, Kathryn L. Evans, Louisa Faulkner, Fiona Francis, John Frankland, Audrey E. Fraser, Petra Galgoczy, James Gilbert, Rachel Gill, Gernot Glöckner, Simon G. Gregory, Susan Gribble, Coline Griffiths, Russell Grocock, Yanghong Gu, Rhian Gwilliam, Cerissa Hamilton, Elizabeth A. Hart, Alicia Hawes, Paul D. Heath, Katja Heitmann, Steffen Hennig, Judith Hernandez, Bernd Hinzmann, Sarah Ho, Michael Hoffs, Phillip J. Howden, Elizabeth J. Huckle, Jennifer Hume, Paul J. Hunt, Adrienne R. Hunt, Judith Isherwood, Leni Jacob, David Johnson, Sally Jones, Pieter J. de Jong, Shirin S. Joseph, Stephen Keenan, Susan Kelly, Joanne K. Kershaw, Ziad Khan, Petra Kioschis, Sven Klages, Andrew J. Knights, Anna Kosiura, Christie Kovar-Smith, Gavin K. Laird, Cordelia Langford, Stephanie Lawlor, Margaret Leversha, Lora Lewis, Wen Liu, Christine Lloyd, David M. Lloyd, Hermela Loulseged, Jane E. Loveland, Jamieson D. Lovell, Ryan Lozado, Jing Lu, Rachael Lyne, Jie Ma, Manjula Maheshwari, Lucy H. Matthews, Jennifer McDowall, Stuart McLaren, Amanda McMurray, Patrick Meidl, Thomas Meitinger, Sarah Milne, George Miner, Shailesh L. Mistry, Margaret Morgan, Sidney Morris, Ines Müller, James C. Mullikin, Ngoc Nguyen, Gabriele Nordsiek, Gerald Nyakatura, Christopher N. O'Dell, Geoffery Okwuonu, Sophie Palmer, Richard Pandian, David Parker, Julia Parrish, Shiran Pasternak, Dina Patel, Alex V. Pearce, Danita M. Pearson, Sarah E. Pelan, Lesette Perez, Keith M. Porter, Yvonne Ramsey, Kathrin Reichwald, Susan Rhodes, Kerry A. Ridler, David Schlessinger, Mary G. Schueler, Harminder K. Sehra, Charles Shaw-Smith, Hua Shen, Elizabeth M. Sheridan, Ratna Shownkeen, Carl D. Skuce, Michelle L. Smith, Elizabeth C. Sotheran, Helen E. Steingruber, Charles A. Steward, Roy Storey, R. Mark Swann, David Swarbreck, Paul E. Tabor, Stefan Taudien, Tineace Taylor, Brian Teague, Karen Thomas, Andrea Thorpe, Kirsten Timms, Alan Tracey, Steve Trevanion, Anthony C. Tromans, Michele d'Urso, Daniel Verduzco, Donna Villasana, Lenee Waldron, Melanie Wall, Qiaoyan Wang, James Warren, Georgina L. Warry, Xuehong Wei, Anthony West, Siobhan L. Whitehead, Mathew N. Whiteley, Jane E. Wilkinson, David L. Willey, Gabrielle Williams, Leanne Williams, Angela Williamson, Helen Williamson, Laurens Wilming, Rebecca L. Woodmansey, Paul W. Wray, Jennifer Yen, Jingkun Zhang, Jianling Zhou, Huda Zoghbi, Sara Zorilla, David Buck, Richard Reinhardt, Annemarie Poustka, André Rosenthal, Hans Lehrach, Alfons Meindl, Patrick J. Minx, LaDeana W. Hillier, Huntington F. Willard, Richard K. Wilson, Robert H. Waterston, Catherine M. Rice, Mark Vaudin, Alan Coulson, David L. Nelson, George Weinstock, John E. Sulston, Richard Durbin, Tim Hubbard, Richard A. Gibbs, Stephan Beck, Jane Rogers and David R. Bentley

Nature 434, 325-337(17 March 2005)

doi:10.1038/nature03440

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The pericentromeric region of the X chromosome is shown as a truncated ideogram. Self-self alignments of proximal sequences from each arm are illustrated by dotter plots below the ideogram. On each plot, the junction between the arm sequence and the arm-specific satellite region is marked by a red arrow, and the junction between the arm-specific satellite region and the X-chromosome-specific alpha satellite array (DXZ1) is marked with a blue arrow. Approximately 594 kb of sequence were analysed from Xp, including approx21 kb of DXZ1 sequence. The approx454 kb of sequence analysed from Xq included approx44 kb of DXZ1 sequence. In each case, approx100 kb of arm sequence were included. The highly repetitive structure of pericentromeric satellites is in stark contrast to the near absence of repetitive structure in the arm sequences, despite an unusually high density of LINE repeats in these regions. Gaps in the dark satellite regions occur where interspersed elements (LINEs, SINEs and LTRs) interrupt the satellite sequences. In the Array Sequences dotter plot, the most proximal approx21 kb of the Xp sequence is joined to the most proximal approx44 kb of the Xq sequence. The periodic nature of the centromeric, higher-order alpha satellite array is evident. Black horizontal lines on the plot reveal near identity of sequences spaced at approx2 kb intervals. This DXZ1 sample represents approx65 kb of the 3 (plusminus 0.4) Mb alpha satellite array. The regions outlined in blue are self-self alignments ('Xp DXZ1' and 'Xq DXZ1'), and the remaining rectangular region of the plot is an alignment of Xp versus Xq DXZ1, which reveals the close relationship between DXZ1 sequences from each arm.

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