Science · Genetics
what factors determine recombination hotspot positions in mammalian genomes?
Recombination hotspot positions in mammalian genomes are shaped by an interaction of DNA sequence features, chromatin state, and the molecular machinery that initiates and repairs meiotic double strand breaks. Hotspots
which mechanisms generate de novo mutations during human gametogenesis?
De novo mutations during human gametogenesis arise from multiple molecular processes that operate in the developing germline. These include replication errors during cell division, failures or misrepair of double-strand DNA
how do transposable elements contribute to genome evolution in vertebrates?
Transposable elements are DNA sequences that can move within genomes and make up a large fraction of vertebrate DNA. Barbara McClintock Cold Spring Harbor Laboratory first recognized mobile genetic elements
how do structural variants influence human phenotypic diversity?
Structural changes to chromosomes, collectively called structural variants, include deletions, duplications, inversions, translocations and mobile element insertions. These rearrangements can span thousands to millions of base pairs and alter gene
how does somatic mosaicism influence disease risk and tissue function?
Somatic mosaicism occurs when cells within the same person carry different genomes because of mutations that arise after fertilization. This intrapersonal genetic diversity can be present in a few cells
how does mitochondrial dna inheritance impact population genetic diversity?
Mitochondrial DNA inheritance influences population genetic diversity through a combination of transmission mode, mutation dynamics, and interaction with human behavior and environment. Because mitochondria are inherited almost exclusively from mothers,
which variants contribute most to complex trait heritability?
Most of the heritability captured by current genetic studies of complex traits comes from common variants acting in aggregate rather than from a few rare, large-effect mutations. Genome-wide association studies
how does recombination affect genetic linkage across generations?
Genetic recombination during meiosis reshuffles parental chromosomes by exchanging DNA between homologous chromatids. This physical exchange reduces genetic linkage, the tendency for nearby genes to be inherited together, because crossover
what determines penetrance of dominant disease alleles?
Penetrance measures the probability that an individual who carries a particular genetic variant will express the associated trait or disease. For dominant disease alleles penetrance is not an all-or-nothing property
how does horizontal gene transfer shape microbial genomes?
Microbial genomes are shaped not only by inheritance from parent to offspring but also by the acquisition of genetic material from unrelated organisms. This process, horizontal gene transfer, rearranges evolutionary