Patents by Inventor Si Lok

Si Lok has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10385334
    Abstract: Molecular identity tags and methods of marking target nucleic acids with molecular identity tags for identifying intermolecular ligation products. Terminal regions of linear target nucleic acids are marked with pairs of distinguishable molecular identity tags. Each linear target nucleic acid is marked with only one distinguishable pair. The terminal ends of the marked target nucleic acids are joined to generate circularized nucleic acids, thereby juxtaposing two molecular identity tags across the joined terminal ends. Circularized nucleic acids or downstream products thereof comprising juxtaposed unpaired molecular identity tags constitute intermolecular nucleic acid products that can be identified and eliminated from subsequent analyses of the nucleic acids. The molecular identity tags may comprise physically linked and non-physically linked pairs. Physically linked molecular identity tags designed for production and analysis of mate-pair libraries with next-generation sequencing platforms are provided.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: August 20, 2019
    Inventor: Si Lok
  • Publication number: 20160108394
    Abstract: Molecular identity tags and methods of marking target nucleic acids with molecular identity tags for identifying intermolecular ligation products. Terminal regions of linear target nucleic acids are marked with pairs of distinguishable molecular identity tags. Each linear target nucleic acid is marked with only one distinguishable pair. The terminal ends of the marked target nucleic acids are joined to generate circularized nucleic acids, thereby juxtaposing two molecular identity tags across the joined terminal ends. Circularized nucleic acids or downstream products thereof comprising juxtaposed unpaired molecular identity tags constitute intermolecular nucleic acid products that can be identified and eliminated from subsequent analyses of the nucleic acids. The molecular identity tags may comprise physically linked and non-physically linked pairs. Physically linked molecular identity tags designed for production and analysis of mate-pair libraries with next-generation sequencing platforms are provided.
    Type: Application
    Filed: May 30, 2014
    Publication date: April 21, 2016
    Inventor: Si LOK
  • Patent number: 8329400
    Abstract: A method of juxtaposing sequence tags (GVTs) that are unique positional markers along the length of a population of target nucleic acid molecules is provided, the method comprising: fragmenting the target nucleic acid molecule to form target DNA insert; ligating the target DNA insert to a DNA vector or backbone to create a circular molecule; digesting the target DNA insert endonuclease to cleave the target DNA insert at a distance from each end of the target DNA insert yielding two GVTs comprising terminal sequences of the target DNA insert attached to an undigested linear backbone; recircularizing the linear backbone with the attached GVTs to obtain a circular DNA containing a GVT-pair having two juxtaposed GVTs; and recovering the GVT-pair DNA by nucleic acid amplification or digestion with endonuclease having sites flanking the GVT-pair. Cosmid vectors are provided for creating GVT-pairs of ˜45- to 50-kb separation sequencable by next-generation DNA sequencers.
    Type: Grant
    Filed: July 10, 2009
    Date of Patent: December 11, 2012
    Assignee: Versitech Limited
    Inventor: Si Lok
  • Patent number: 7932029
    Abstract: The invention disclosed herein describes methods for the mapping and identification of fine-structural variations in nucleic acids.
    Type: Grant
    Filed: January 3, 2007
    Date of Patent: April 26, 2011
    Inventor: Si Lok
  • Publication number: 20110054158
    Abstract: Novel receptor polypeptides, polynucleotides encoding the polypeptides, and related compositions and methods are disclosed. The polypeptides comprise an extracellular domain of a cell-surface receptor that is expressed in kidneys, pancreas, prostate, adrenal cortex and nervous tissue. The polypeptides may be used within methods for detecting ligands that promote the proliferation and/or differentiation of these organs.
    Type: Application
    Filed: October 7, 2010
    Publication date: March 3, 2011
    Inventors: SI LOK, CHOON J. KHO, ANNA C. JELMBERG, ROBYN L. ADAMS, THEODORE E. WHITMORE, THERESA M. FARRAH
  • Publication number: 20100298543
    Abstract: Novel receptor polypeptides, polynucleotides encoding the polypeptides, and related compositions and methods are disclosed. The polypeptides comprise an extracellular domain of a cell-surface receptor that is expressed in pancreas, small intestine, colon and thymus. The polypeptides may be used within methods for detecting ligands that promote the proliferation and/or differentiation of these organs.
    Type: Application
    Filed: March 26, 2010
    Publication date: November 25, 2010
    Inventors: Si Lok, Robyn L. Adams, Anna C. Jelmberg, Theodore E. Whitmore, Theresa M. Farrah
  • Publication number: 20100099184
    Abstract: Novel receptor polypeptides, polynucleotides encoding the polypeptides, and related compositions and methods are disclosed. The polypeptides comprise an extracellular domain of a cell-surface receptor that is expressed in kidneys, pancreas, prostate, adrenal cortex and nervous tissue. The polypeptides may be used within methods for detecting ligands that promote the proliferation and/or differentiation of these organs.
    Type: Application
    Filed: October 1, 2009
    Publication date: April 22, 2010
    Inventors: Si Lok, Choon J. Kho, Anna C. Jelmberg, Robyn L. Adams, Theodore E. Whitmore, Theresa M. Farrah
  • Publication number: 20100055778
    Abstract: Novel receptor polypeptides, polynucleotides encoding the polypeptides, and related compositions and methods are disclosed. The polypeptides comprise an extracellular domain of a cell-surface receptor that is expressed in pancreas, small intestine, colon and thymus. The polypeptides may be used within methods for detecting ligands that promote the proliferation and/or differentiation of these organs.
    Type: Application
    Filed: September 10, 2009
    Publication date: March 4, 2010
    Applicant: ZymoGenetics, Inc
    Inventors: Si Lok, Robyn L. Adams, Anna C. Jelmberg, Theodore E. Whitmore, Theresa M. Farrah
  • Publication number: 20090325239
    Abstract: A method of juxtaposing sequence tags (GVTs) that are unique positional markers along the length of a population of target nucleic acid molecules is provided, the method comprising: fragmenting the target nucleic acid molecule to form target DNA insert; ligating the target DNA insert to a DNA vector or backbone to create a circular molecule; digesting the target DNA insert endonuclease to cleave the target DNA insert at a distance from each end of the target DNA insert yielding two GVTs comprising terminal sequences of the target DNA insert attached to an undigested linear backbone; recircularizing the linear backbone with the attached GVTs to obtain a circular DNA containing a GVT-pair having two juxtaposed GVTs; and recovering the GVT-pair DNA by nucleic acid amplification or digestion with endonuclease having sites flanking the GVT-pair. Cosmid vectors are provided for creating GVT-pairs of ˜45- to 50-kb separation sequencable by next-generation DNA sequencers.
    Type: Application
    Filed: July 10, 2009
    Publication date: December 31, 2009
    Inventor: Si LOK
  • Publication number: 20090156431
    Abstract: An in vitro, extracellular method of juxtaposing sequence tags (GVTs) where two constituent members of a tag pair (GVT-pair) are unique positional markers of a defined separation distance and/or are markers of nucleic acid positions that demarcate adjacent cleavage sites for one or more different restriction endonucleases along the length of a plurality of target nucleic acid molecules, the method comprising: Fragmenting the target nucleic acid molecule to form target DNA insert; ligating a DNA adaptor having one or more restriction endonuclease recognition sites to both ends of a fragmented target DNA insert and the ligation of the adaptor-ligated target DNA insert to a DNA backbone to create a circular molecule; digesting the adaptor using a restriction endonuclease at the recognition site to cleave the target DNA insert at a defined distance from each end thereof to create two sequence tags (GVTs) comprising terminal sequences of the target DNA insert that are attached to the linear DNA backbone; and recir
    Type: Application
    Filed: December 12, 2007
    Publication date: June 18, 2009
    Inventor: Si Lok
  • Publication number: 20090074799
    Abstract: Antibodies to novel receptor polypeptides, polynucleotides encoding the polypeptides, and related compositions and methods are disclosed. The polypeptides comprise an extracellular domain of a cell-surface receptor that is expressed in kidneys, pancreas, prostate, adrenal cortex and nervous tissue. The polypeptides may be used within methods for detecting ligands that promote the proliferation and/or differentiation of these organs.
    Type: Application
    Filed: June 9, 2008
    Publication date: March 19, 2009
    Inventors: Si Lok, Choon J. Kho, Anna C. Jelmberg, Robyn L. Adams, Theodore E. Whitmore, Theresa M. Farrah
  • Publication number: 20090047680
    Abstract: The invention relates to novel methods and compositions to produce DNA templates suitable for chemical modifications and high-throughput DNA-sequencing. A method of the invention relates to a DNA adaptor design where constituent deoxycytosines are substituted with 5-methyl-deoxycytosines rendering the resulting adaptor resistant to bisulphite mediated deamination. When said adaptor is ligated onto double stranded DNA template, subsequent DNA denaturation and bisulphite treatment deaminates template DNA deoxycytosine differentially to deoxyuraeil whilst the 5-methyl-deoxycytosines of the ligated adaptor resist chemical conversion resulting in the adaptor sequence remaining unaltered. Both strands of bisulphite treated DNA can thus be amplified with a single primer set that hybridizes to the unaltered adaptor sequence. The invention also relates to methods to produce control template of a defined methylation composition to optimize conditions for the bisulphite reaction.
    Type: Application
    Filed: August 15, 2008
    Publication date: February 19, 2009
    Inventor: SI LOK
  • Patent number: 7125973
    Abstract: Methods and vectors are described for expressing recombinant proteins on the surface of host cells. These processes and compositions provide the basis for strategies to produce a fusion protein, comprising a membrane anchor that allows extracellular attachment of the fusion protein in a type II orientation.
    Type: Grant
    Filed: October 24, 2003
    Date of Patent: October 24, 2006
    Assignee: ZymoGenetics, Inc.
    Inventor: Si Lok
  • Publication number: 20060160091
    Abstract: Novel receptor polypeptides, polynucleotides encoding the polypeptides, and related compositions and methods are disclosed. The polypeptides comprise an extracellular domain of a cell-surface receptor that is expressed in kidneys, pancreas, prostate, adrenal cortex and nervous tissue. The polypeptides may be used within methods for detecting ligands that promote the proliferation and/or differentiation of these organs.
    Type: Application
    Filed: August 7, 2003
    Publication date: July 20, 2006
    Inventors: Si Lok, Choon Kho, Anna Jelmberg, Robyn Adams, Theodore Whitmore, Theresa Farrah
  • Publication number: 20060150267
    Abstract: The present invention provides testis-specific insulin homolog polypeptides and polynucleotides encoding the polypeptides, as well as related compositions and methods are disclosed. The polypeptides and polynucleotides may be used within methods for enhancing viability of cryopreserved sperm, for enhancing sperm motility, to enhance fertilization in methods of assisted reproduction, as contraceptives and other related uses.
    Type: Application
    Filed: March 13, 2006
    Publication date: July 6, 2006
    Inventors: Si Lok, Darrell Conklin, Catherine Lofton-Day, Stephen Jaspers, Michael Stamm
  • Patent number: 7070774
    Abstract: The present invention provides testis-specific insulin homolog polypeptides and polynucleotides encoding the polypeptides, as well as related compositions and methods are disclosed. The polypeptides and polynucleotides may be used within methods for enhancing viability of cryopreserved sperm, for enhancing sperm motility, to enhance fertilization in methods of assisted reproduction, as contraceptives and other related uses.
    Type: Grant
    Filed: November 3, 2003
    Date of Patent: July 4, 2006
    Assignee: ZymoGenetics, Inc.
    Inventors: Si Lok, Darrell C. Conklin, Catherine E. Lofton-Day, Stephen R. Jaspers, Michael R. Stamm
  • Publication number: 20050244832
    Abstract: Novel receptor polypeptides, polynucleotides encoding the polypeptides, and related compositions and methods are disclosed. The polypeptides comprise an extracellular domain of a cell-surface receptor that is expressed in kidneys, pancreas, prostate, adrenal cortex and nervous tissue. The polypeptides may be used within methods for detecting ligands that promote the proliferation and/or differentiation of these organs.
    Type: Application
    Filed: August 7, 2003
    Publication date: November 3, 2005
    Inventors: Si Lok, Choon Kho, Anna Jelmberg, Robyn Adams, Theodore Whitmore, Theresa Farrah
  • Patent number: 6908751
    Abstract: The increased use of nucleotide sequence data mining techniques has amplified the demand for efficient methods of producing recombinant proteins in eukaryotic cells. A strategy is provided for enhancing the synthesis of recombinant amino acid sequences by polymerizing expression cassettes in vitro before producing recombinant hosts.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: June 21, 2005
    Assignee: ZymoGenetics, Inc.
    Inventor: Si Lok
  • Publication number: 20050079583
    Abstract: Novel receptor polypeptides, polynucleotides encoding the polypeptides, and related compositions and methods are disclosed. The polypeptides comprise an extracellular domain of a cell-surface receptor that is expressed in pancreas, small intestine, colon and thymus. The polypeptides may be used within methods for detecting ligands that promote the proliferation and/or differentiation of these organs.
    Type: Application
    Filed: December 6, 2004
    Publication date: April 14, 2005
    Inventors: Si Lok, Robyn Adams, Anna Jelmberg, Theodore Whitmore, Theresa Farrah
  • Publication number: 20040180398
    Abstract: Receptors perform many functions that are essential for the metabolism and differentiation of cells. As such, this class of proteins often provides targets for therapeutically useful drugs. The present invention provides a new human membrane-associated polypeptide, designated “Zsig43.
    Type: Application
    Filed: October 24, 2001
    Publication date: September 16, 2004
    Inventors: Paul O. Sheppard, Si Lok