10 research outputs found
Glial Hsp70 Protects K+ Homeostasis in the Drosophila Brain during Repetitive Anoxic Depolarization
Neural tissue is particularly vulnerable to metabolic stress and loss of ion homeostasis. Repetitive stress generally leads to more permanent dysfunction but the mechanisms underlying this progression are poorly understood. We investigated the effects of energetic compromise in Drosophila by targeting the Na+/K+-ATPase. Acute ouabain treatment of intact flies resulted in subsequent repetitive comas that led to death and were associated with transient loss of K+ homeostasis in the brain. Heat shock pre-conditioned flies were resistant to ouabain treatment. To control the timing of repeated loss of ion homeostasis we subjected flies to repetitive anoxia while recording extracellular [K+] in the brain. We show that targeted expression of the chaperone protein Hsp70 in glial cells delays a permanent loss of ion homeostasis associated with repetitive anoxic stress and suggest that this is a useful model for investigating molecular mechanisms of neuroprotection
Editing the genome of chicken primordial germ cells to introduce alleles and study gene function
With continuing advances in genome sequencing technology, the chicken genome
assembly is now better annotated with improved accuracy to the level of single
nucleotide polymorphisms. Additionally, the genomes of other birds such as the duck,
turkey and zebra finch have now been sequenced. A great opportunity exists in avian
biology to use genome editing technology to introduce small and defined sequence
changes to create specific haplotypes in chicken to investigate gene regulatory
function, and also perform rapid and seamless transfer of specific alleles between
chicken breeds. The methods for performing such precise genome editing are well
established for mammalian species but are not readily applicable in birds due to
evolutionary differences in reproductive biology.
A significant leap forward to address this challenge in avian biology was the
development of long-term culture methods for chicken primordial germ cells (PGCs).
PGCs present a cell line in which to perform targeted genetic manipulations that will
be heritable. Chicken PGCs have been successfully targeted to generate genetically
modified chickens. However, genome editing to introduce small and defined sequence
changes has not been demonstrated in any avian species. To address this deficit, the
application of CRISPR/Cas9 and short oligonucleotide donors in chicken PGCs for
performing small and defined sequence changes was investigated in this thesis.
Specifically, homology-directed DNA repair (HDR) using oligonucleotide donors
along with wild-type CRISPR/Cas9 (SpCas9-WT) or high fidelity CRISPR/Cas9
(SpCas9-HF1) was investigated in cultured chicken PGCs. The results obtained
showed that small sequences changes ranging from a single to a few nucleotides could
be precisely edited in many loci in chicken PGCs. In comparison to SpCas9-WT,
SpCas9-HF1 increased the frequency of biallelic and single allele editing to generate
specific homozygous and heterozygous genotypes. This finding demonstrates the
utility of high fidelity CRISPR/Cas9 variants for performing sequence editing with
high efficiency in PGCs.
Since PGCs can be converted into pluripotent stem cells that can potentially
differentiate into many cell types from the three germ layers, genome editing of PGCs
can, therefore, be used to generate PGC-derived avian cell types with defined genetic
alterations to investigate the host-pathogen interactions of infectious avian diseases.
To investigate this possibility, the chicken ANP32A gene was investigated as a target
for genetic resistance to avian influenza virus in PGC-derived chicken cell lines.
Targeted modification of ANP32A was performed to generate clonal lines of genome-edited
PGCs. Avian influenza minigenome replication assays were subsequently
performed in the ANP32A-mutant PGC-derived cell lines. The results verified that
ANP32A function is crucial for the function of both avian virus polymerase and
human-adapted virus polymerase in chicken cells. Importantly, an asparagine to
isoleucine mutation at position 129 (N129I) in chicken ANP32A failed to support
avian influenza polymerase function. This genetic change can be introduced into
chickens and validated in virological studies. Importantly, the results of my
investigation demonstrate the potential to use genome editing of PGCs as an approach
to generate many types of unique cell models for the study of avian biology.
Genome editing of PGCs may also be applied to unravel the genes that control the
development of the avian germ cell lineage. In the mouse, gene targeting has been
extensively applied to generate loss-of-function mouse models to use the reverse
genetics approach to identify key genes that regulate the migration of specified PGCs
to the genital ridges. Avian PGCs express similar cytokine receptors as their
mammalian counterparts. However, the factors guiding the migration of avian PGCs
are largely unknown. To address this, CRISPR/Cas9 was used in this thesis to generate
clonal lines of chicken PGCs with loss-of-function deletions in the CXCR4 and c-Kit
genes which have been implicated in controlling mouse PGC migration. The results
showed that CXCR4-deficient PGCs are absent from the gonads whereas c-Kit-deficient
PGCs colonise the developing gonads in reduced numbers and are
significantly reduced or absent from older stages. This finding shows a conserved role
for CXCR4 and c-Kit signalling in chicken PGC development. Importantly, other
genes suspected to be involved in controlling the development of avian germ cells can
be investigated using this approach to increase our understanding of avian reproductive
biology.
Finally, the methods developed in this thesis for editing of the chicken genome may
be applied in other avian species once culture methods for the PGCs from these species
are develope
Two extended haplotype blocks are associated with adaptation to high altitude habitats in East African honey bees
Understanding the genetic basis of adaption is a central task in biology. Populations of the honey bee Apis mellifera that inhabit the mountain forests of East Africa differ in behavior and morphology from those inhabiting the surrounding lowland savannahs, which likely reflects adaptation to these habitats. We performed whole genome sequencing on 39 samples of highland and lowland bees from two pairs of populations to determine their evolutionary affinities and identify the genetic basis of these putative adaptations. We find that in general, levels of genetic differentiation between highland and lowland populations are very low, consistent with them being a single panmictic population. However, we identify two loci on chromosomes 7 and 9, each several hundred kilobases in length, which exhibit near fixation for different haplotypes between highland and lowland populations. The highland haplotypes at these loci are extremely rare in samples from the rest of the world. Patterns of segregation of genetic variants suggest that recombination between haplotypes at each locus is suppressed, indicating that they comprise independent structural variants. The haplotype on chromosome 7 harbors nearly all octopamine receptor genes in the honey bee genome. These have a role in learning and foraging behavior in honey bees and are strong candidates for adaptation to highland habitats. Molecular analysis of a putative breakpoint indicates that it may disrupt the coding sequence of one of these genes. Divergence between the highland and lowland haplotypes at both loci is extremely high suggesting that they are ancient balanced polymorphisms that greatly predate divergence between the extant honey bee subspecies