Copy Number Variation In Human Health Disease And Evolution Pdf
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- Implications of gene copy-number variation in health and diseases
- Copy number variation
Autism spectrum disorders ASDs are characterized by language impairments, social deficits, and repetitive behaviors. The onset of symptoms occurs by the age of 3 and shows a lifelong persistence. Genetics plays a major role in the etiology of ASD. Except genetics, several potential risk factors environmental factors and epigenetics may contribute to ASD. Copy number variations CNVs are the most widespread structural variations in the human genome. These variations can alter the genome structure either by deletion or by duplication.
Copy number variation CNV is a phenomenon in which sections of the genome are repeated and the number of repeats in the genome varies between individuals. Copy number variations can be generally categorized into two main groups: short repeats and long repeats. However, there are no clear boundaries between the two groups and the classification depends on the nature of the loci of interest. Short repeats include mainly bi-nucleotide repeats two repeating nucleotides e. Long repeats include repeats of entire genes.
Implications of gene copy-number variation in health and diseases
Metrics details. Copy number variation CNV has been examined in many species and is recognized as a major source of genetic variation that directly contributes to phenotypic variation such as resistance to infectious diseases. Two highly inbred chicken lines, 6 3 MD-resistant and 7 2 MD-susceptible , as well as their F 1 generation and six recombinant congenic strains RCSs with varied susceptibility to MD, are considered as ideal models to identify the complex mechanisms of genetic and molecular resistance to MD. In the present study, to unravel the potential genetic mechanisms underlying resistance to MD, we performed a genome-wide CNV detection using next generation sequencing on the inbred chicken lines with the assistance of CNVnator. Within these shared regions, harbored genes were identified. In addition, 55 and 44 CNVRs with 62 and 57 harbored genes were specifically identified in line 6 3 and 7 2 , respectively. Ten CNVRs nine deletions and one duplication involved in 10 disease-related genes were selected for validation by using quantitative real-time PCR qPCR , all of which were successfully confirmed.
Copy number variation (CNV) is a source of genetic diversity in humans. Numerous CNVs are being identified with various genome analysis platforms, including.
Copy number variation
Molecular methods, by which copy number variants CNVs detection is available, have been gradually introduced into routine diagnostics over the last 15 years. Despite this, some CNVs continue to be a huge challenge when it comes to clinical interpretation. CNVs are an important source of normal and pathogenic variants, but, in many cases, their impact on human health depends on factors that are not yet known. Therefore, perception of their clinical consequences can change over time, as our knowledge grows. This review summarises guidelines that facilitate correct classification of identified changes and discusses difficulties with the interpretation of rare, small CNVs.
Department of Genetics, Harvard Medical School
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Zhang and W. Gu and M.
Protocol DOI: Copy number variation CNV , where a segment of DNA differs in copy number between different individuals, is an extensive and often underappreciated source of genetic variation within species.
A computational tool to detect both germline and mosaic chromosomal alterations at low allelic fractions based on phased haplotype data. Mosaic chromsomal alterations in diploid cells affect the overall balance of alleles from the two haplotypes at consecutive heterozygous sites. Long-range phase information allows the careful integration of this imbalance across long chromosomal segments. By carefully performing this integration, MoChA is capable of detecting mosaic chromosomal alterations present in as little as one percent of the cells that comprise the DNA library.
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