Abstract:
Described are techniques for determining population structure from identity-by-descent (IBD) of individuals. The techniques may be used to predict that an individual belongs to zero, one or more of a number of communities identified within an IBD network. Additional data may be used to annotate the communities with birth location, surname, and ethnicity information. In turn, these data may be used to provide to an individual a prediction of membership to zero, one or more communities, accompanied by a summary of the information annotated to those communities.
Abstract:
Methods are provided of using a database that stores a plurality of reference genomes and phylogenetic information which relates the stored reference genomes to each other in a phylogenetic structure. These methods are useful in analysing the bacteria and/or bacterial lineages present in a sample and to identify a bacterium for use in therapy.
Abstract:
Provided herein are computer implemented methods, systems and processes for determining a transmission metric or transmission path for related pathogens. Also provided herein is a non-transitory computer-readable storage medium with an executable program stored thereon, which program is configured to instruct a microprocessor to generate a transmission path for related pathogens.
Abstract:
Inferring a characteristic of an individual is disclosed. An indication that a first user and a second user have at least one shared chromosomal segment is received. Information about the second user is obtained. A characteristic of the first user is inferred based at least in part on the information about the second user.
Abstract:
The present disclosure describes systems and methods for determining sources of infection transmission. Phylogenetic methods are used for determining the evolutionary history and replication rates of infection isolates. The evolutionary distance and/or replication rate of an infection isolate maybe compared to other isolates. Based on a comparison of the evolutionary distance and/or replication rate, a determination of the source of infection transmission is made.
Abstract:
Ancestry has a significant impact on the major and minor alleles found in each nucleotide position within the genome. Due to mechanisms of inheritance, ancestral-specific information contained within the genome is conserved within members of an ancestry. For this reason, individuals within a specific ancestry are more likely to share alleles in their genomes with other members of the same ancestry. Functionally, the combination of alleles at all positions within a group of individuals defines that group as having a common ancestry. Moreover, the aggregation of differences between alleles at all positions distinguishes one ancestry from another. The genomic similarities and differences between ancestries provides a mechanism to generate reference genomes that are specific for each ancestry. Reference genomes that are specific to an ancestry can be used to increase the accuracy of whole genome sequencing, DNA-based diagnostics and therapeutic marker discovery and in a variety of real-world DNA-based applications. Provided herein are methods for constructing an ancestral-specific reference genome database.
Abstract:
Selecting which sub-sequences in a database of nucleic acid such as 16S rRNA are highly characteristic of particular groupings of bacteria, microorganisms, fungi, etc. on a substantially phylogenetic tree. Also applicable to viruses comprising viral genomic RNA or DNA. A catalogue of highly characteristic sequences identified by this method is assembled to establish the genetic identity of an unknown organism. The characteristic sequences are used to design nucleic acid hybridization probes that include the characteristic sequence or its complement, or are derived from one or more characteristic sequences. A plurality of these characteristic sequences is used in hybridization to determine the phylogenetic tree position of the organism(s) in a sample. Those target organisms represented in the original sequence database and sufficient characteristic sequences can identify to the species or subspecies level. Oligonucleotide arrays of many probes are especially preferred. A hybridization signal can comprise fluorescence, chemiluminescence, or isotopic labeling, etc.; or sequences in a sample can be detected by direct means, e.g. mass spectrometry. The method's characteristic sequences can also be used to design specific PCR primers. The method uniquely identifies the phylogenetic affinity of an unknown organism without requiring prior knowledge of what is present in the sample. Even if the organism has not been previously encountered, the method still provides useful information about which phylogenetic tree bifurcation nodes encompass the organism.
Abstract:
Systems and methods for analyzing community structures within a plurality of environmental samples are described herein. The method includes obtaining taxa data corresponding to taxonomic groups within the plurality of the environmental samples. Based on the taxa data, an abundance value for each of the taxonomic groups with respect to each of the plurality of environmental samples is determined. Further, based on abundance values, an interaction factor for each pair of the taxonomic groups in the plurality of environmental samples is computed. The interaction factor is indicative of a degree of interaction between a pair of taxonomic groups from among the taxonomic groups. Based in part on interaction factors and abundance values, the plurality of the environmental samples is clustered.
Abstract:
Most clinically distinguishable malignant tumors are characterized by specific mutations, specific patterns of chromosomal rearrangements and a predominant mechanism of genetic instability. It has been suggested that the internal dynamics of genomic modifications as opposed to the external evolutionary forces have a significant and complex impact on Darwinian species evolution. A similar situation can be expected for somatic cancer evolution as the key mechanisms encountered in species evolution such as duplications, rearrangements or deletions of genes also constitute prevalent mutation mechanisms in cancers with chromosomal instability. The invention is an algorithm which is based on a systems concept describing the putative constraints of the cancer genome architecture on somatic cancer evolution. The algorithm allows the identification of therapeutic target genes in individual cancer patients which do not represent oncogenes or tumor suppressor genes but have become putative therapeutic targets due to constraints of the cancer genome architecture on individual somatic cancer evolution. Target genes or regulatory elements may be identified by their designation as essential genes or regulatory elements in cancer cells of the patient but not in normal tissue cells or they may be identified by their impact on the process of somatic cancer evolution in individual patients based on phylogenetic trees of somatic cancer evolution and on the constructed multilayered cancer genome maps. The algorithm can be used for delivering personalized cancer therapy as well as for the industrial identification of novel anti-cancer drugs. The algorithm is essential for designing software programs which allow the prediction of the natural history of cancer disease in individual patients.
Abstract:
Systems and methods are provided for selecting from among polygenic models that predict characteristics of individuals. One embodiment is a genetic prediction server that includes a memory that stores polygenic models which predict characteristics of individuals based on genetic variants of the individuals, including a set of polygenic models for a characteristic that each perform a different analysis of genetic variants when making a prediction. The server also includes a controller that receives an indication of genetic variants of an individual, determines that the individual belongs to a demographic, and selects, based on the demographic, a polygenic model from the set to predict the characteristic for the individual.