INSIGHTS INTO THE GENETIC DIVERSITY OF ASIMINA TRILOBA: A STUDY USING GENOME ASSEMBLY AND POPULATION GENETICS
The objective of this PhD thesis was to understand the factors influencing the evolutionary history and distribution of genetic variation in the species Asimina triloba, commonly known as pawpaw. To achieve this, we have produced a high-quality reference genome by assembling a draft genome using Pac...
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Università degli Studi di Milano
2023
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Online Access: | https://hdl.handle.net/2434/969220 |
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ftunivmilanoair:oai:air.unimi.it:2434/969220 2024-02-11T10:04:54+01:00 INSIGHTS INTO THE GENETIC DIVERSITY OF ASIMINA TRILOBA: A STUDY USING GENOME ASSEMBLY AND POPULATION GENETICS FRIEL, JAMES tutor: Martin Kater A. Bombarely; supervisor: S. Masiero D. Haak I. Hormaza J. Friel KATER, MARTIN MASIERO, SIMONA 2023-05-19 https://hdl.handle.net/2434/969220 eng eng Università degli Studi di Milano https://hdl.handle.net/2434/969220 info:eu-repo/semantics/openAccess Asimina triloba Pawpaw Genome assembly Genotype-by-sequencing Genetic diversity Population genetics Settore BIO/18 - Genetica info:eu-repo/semantics/doctoralThesis 2023 ftunivmilanoair 2024-01-16T23:14:17Z The objective of this PhD thesis was to understand the factors influencing the evolutionary history and distribution of genetic variation in the species Asimina triloba, commonly known as pawpaw. To achieve this, we have produced a high-quality reference genome by assembling a draft genome using PacBio's Sequel II long reads and polishing with Illumina short reads. We first used a genotype-by-sequencing (GBS) to genotype 124 individuals from 28 sites across the state of Virginia to produce a set of single nucleotide polymorphisms (SNPs). We then analysed the population structure and genetic diversity, revealing evidence of isolation by distance and an increase in geneflow over long distance by individuals along rivers. Following on from this, an improved genome assembly was produced by incorporating HiFi, Hi-C, and RNA-seq data, resulting in an annotated, highly contiguous, and accurate genome assembly. The improved draft assembly provided a more comprehensive view of the genome structure and organization of A. triloba, allowing for the construction of pseudochromosomes and genome annotation, including the identification of repeat and transposable elements. An additional population genetics study was then carried out using the same GBS approach to analyse over 300 wild individuals collected from across North America. Our analysis provided insight into the overall diversity of the species and indicated that A. triloba may have experienced a bottleneck. This may have resulted from a reduced population size in its Pliocene refugia prior to the species’ northern migration after the retreat of the Laurentide Ice Sheet. This research has important implications for understanding the mechanisms underlying genetic diversity in the species and conservation efforts. Doctoral or Postdoctoral Thesis Ice Sheet The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
institution |
Open Polar |
collection |
The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
op_collection_id |
ftunivmilanoair |
language |
English |
topic |
Asimina triloba Pawpaw Genome assembly Genotype-by-sequencing Genetic diversity Population genetics Settore BIO/18 - Genetica |
spellingShingle |
Asimina triloba Pawpaw Genome assembly Genotype-by-sequencing Genetic diversity Population genetics Settore BIO/18 - Genetica FRIEL, JAMES INSIGHTS INTO THE GENETIC DIVERSITY OF ASIMINA TRILOBA: A STUDY USING GENOME ASSEMBLY AND POPULATION GENETICS |
topic_facet |
Asimina triloba Pawpaw Genome assembly Genotype-by-sequencing Genetic diversity Population genetics Settore BIO/18 - Genetica |
description |
The objective of this PhD thesis was to understand the factors influencing the evolutionary history and distribution of genetic variation in the species Asimina triloba, commonly known as pawpaw. To achieve this, we have produced a high-quality reference genome by assembling a draft genome using PacBio's Sequel II long reads and polishing with Illumina short reads. We first used a genotype-by-sequencing (GBS) to genotype 124 individuals from 28 sites across the state of Virginia to produce a set of single nucleotide polymorphisms (SNPs). We then analysed the population structure and genetic diversity, revealing evidence of isolation by distance and an increase in geneflow over long distance by individuals along rivers. Following on from this, an improved genome assembly was produced by incorporating HiFi, Hi-C, and RNA-seq data, resulting in an annotated, highly contiguous, and accurate genome assembly. The improved draft assembly provided a more comprehensive view of the genome structure and organization of A. triloba, allowing for the construction of pseudochromosomes and genome annotation, including the identification of repeat and transposable elements. An additional population genetics study was then carried out using the same GBS approach to analyse over 300 wild individuals collected from across North America. Our analysis provided insight into the overall diversity of the species and indicated that A. triloba may have experienced a bottleneck. This may have resulted from a reduced population size in its Pliocene refugia prior to the species’ northern migration after the retreat of the Laurentide Ice Sheet. This research has important implications for understanding the mechanisms underlying genetic diversity in the species and conservation efforts. |
author2 |
tutor: Martin Kater A. Bombarely; supervisor: S. Masiero D. Haak I. Hormaza J. Friel KATER, MARTIN MASIERO, SIMONA |
format |
Doctoral or Postdoctoral Thesis |
author |
FRIEL, JAMES |
author_facet |
FRIEL, JAMES |
author_sort |
FRIEL, JAMES |
title |
INSIGHTS INTO THE GENETIC DIVERSITY OF ASIMINA TRILOBA: A STUDY USING GENOME ASSEMBLY AND POPULATION GENETICS |
title_short |
INSIGHTS INTO THE GENETIC DIVERSITY OF ASIMINA TRILOBA: A STUDY USING GENOME ASSEMBLY AND POPULATION GENETICS |
title_full |
INSIGHTS INTO THE GENETIC DIVERSITY OF ASIMINA TRILOBA: A STUDY USING GENOME ASSEMBLY AND POPULATION GENETICS |
title_fullStr |
INSIGHTS INTO THE GENETIC DIVERSITY OF ASIMINA TRILOBA: A STUDY USING GENOME ASSEMBLY AND POPULATION GENETICS |
title_full_unstemmed |
INSIGHTS INTO THE GENETIC DIVERSITY OF ASIMINA TRILOBA: A STUDY USING GENOME ASSEMBLY AND POPULATION GENETICS |
title_sort |
insights into the genetic diversity of asimina triloba: a study using genome assembly and population genetics |
publisher |
Università degli Studi di Milano |
publishDate |
2023 |
url |
https://hdl.handle.net/2434/969220 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://hdl.handle.net/2434/969220 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1790601662005510144 |