---
_id: '282'
abstract:
- lang: eng
text: Adaptive introgression is common in nature and can be driven by selection
acting on multiple, linked genes. We explore the effects of polygenic selection
on introgression under the infinitesimal model with linkage. This model assumes
that the introgressing block has an effectively infinite number of genes, each
with an infinitesimal effect on the trait under selection. The block is assumed
to introgress under directional selection within a native population that is genetically
homogeneous. We use individual-based simulations and a branching process approximation
to compute various statistics of the introgressing block, and explore how these
depend on parameters such as the map length and initial trait value associated
with the introgressing block, the genetic variability along the block, and the
strength of selection. Our results show that the introgression dynamics of a block
under infinitesimal selection is qualitatively different from the dynamics of
neutral introgression. We also find that in the long run, surviving descendant
blocks are likely to have intermediate lengths, and clarify how the length is
shaped by the interplay between linkage and infinitesimal selection. Our results
suggest that it may be difficult to distinguish introgression of single loci from
that of genomic blocks with multiple, tightly linked and weakly selected loci.
article_processing_charge: No
author:
- first_name: Himani
full_name: Sachdeva, Himani
id: 42377A0A-F248-11E8-B48F-1D18A9856A87
last_name: Sachdeva
- first_name: Nicholas H
full_name: Barton, Nicholas H
id: 4880FE40-F248-11E8-B48F-1D18A9856A87
last_name: Barton
orcid: 0000-0002-8548-5240
citation:
ama: Sachdeva H, Barton NH. Introgression of a block of genome under infinitesimal
selection. Genetics. 2018;209(4):1279-1303. doi:10.1534/genetics.118.301018
apa: Sachdeva, H., & Barton, N. H. (2018). Introgression of a block of genome
under infinitesimal selection. Genetics. Genetics Society of America. https://doi.org/10.1534/genetics.118.301018
chicago: Sachdeva, Himani, and Nicholas H Barton. “Introgression of a Block of Genome
under Infinitesimal Selection.” Genetics. Genetics Society of America,
2018. https://doi.org/10.1534/genetics.118.301018.
ieee: H. Sachdeva and N. H. Barton, “Introgression of a block of genome under infinitesimal
selection,” Genetics, vol. 209, no. 4. Genetics Society of America, pp.
1279–1303, 2018.
ista: Sachdeva H, Barton NH. 2018. Introgression of a block of genome under infinitesimal
selection. Genetics. 209(4), 1279–1303.
mla: Sachdeva, Himani, and Nicholas H. Barton. “Introgression of a Block of Genome
under Infinitesimal Selection.” Genetics, vol. 209, no. 4, Genetics Society
of America, 2018, pp. 1279–303, doi:10.1534/genetics.118.301018.
short: H. Sachdeva, N.H. Barton, Genetics 209 (2018) 1279–1303.
date_created: 2018-12-11T11:45:36Z
date_published: 2018-08-01T00:00:00Z
date_updated: 2023-09-13T08:22:32Z
day: '01'
department:
- _id: NiBa
doi: 10.1534/genetics.118.301018
external_id:
isi:
- '000440014100020'
intvolume: ' 209'
isi: 1
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.biorxiv.org/content/early/2017/11/30/227082
month: '08'
oa: 1
oa_version: Submitted Version
page: 1279 - 1303
publication: Genetics
publication_status: published
publisher: Genetics Society of America
publist_id: '7617'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Introgression of a block of genome under infinitesimal selection
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 209
year: '2018'
...
---
_id: '39'
abstract:
- lang: eng
text: We study how a block of genome with a large number of weakly selected loci
introgresses under directional selection into a genetically homogeneous population.
We derive exact expressions for the expected rate of growth of any fragment of
the introduced block during the initial phase of introgression, and show that
the growth rate of a single-locus variant is largely insensitive to its own additive
effect, but depends instead on the combined effect of all loci within a characteristic
linkage scale. The expected growth rate of a fragment is highly correlated with
its long-term introgression probability in populations of moderate size, and can
hence identify variants that are likely to introgress across replicate populations.
We clarify how the introgression probability of an individual variant is determined
by the interplay between hitchhiking with relatively large fragments during the
early phase of introgression and selection on fine-scale variation within these,
which at longer times results in differential introgression probabilities for
beneficial and deleterious loci within successful fragments. By simulating individuals,
we also investigate how introgression probabilities at individual loci depend
on the variance of fitness effects, the net fitness of the introduced block, and
the size of the recipient population, and how this shapes the net advance under
selection. Our work suggests that even highly replicable substitutions may be
associated with a range of selective effects, which makes it challenging to fine
map the causal loci that underlie polygenic adaptation.
article_processing_charge: No
article_type: original
author:
- first_name: Himani
full_name: Sachdeva, Himani
id: 42377A0A-F248-11E8-B48F-1D18A9856A87
last_name: Sachdeva
- first_name: Nicholas H
full_name: Barton, Nicholas H
id: 4880FE40-F248-11E8-B48F-1D18A9856A87
last_name: Barton
orcid: 0000-0002-8548-5240
citation:
ama: Sachdeva H, Barton NH. Replicability of introgression under linked, polygenic
selection. Genetics. 2018;210(4):1411-1427. doi:10.1534/genetics.118.301429
apa: Sachdeva, H., & Barton, N. H. (2018). Replicability of introgression under
linked, polygenic selection. Genetics. Genetics Society of America. https://doi.org/10.1534/genetics.118.301429
chicago: Sachdeva, Himani, and Nicholas H Barton. “Replicability of Introgression
under Linked, Polygenic Selection.” Genetics. Genetics Society of America,
2018. https://doi.org/10.1534/genetics.118.301429.
ieee: H. Sachdeva and N. H. Barton, “Replicability of introgression under linked,
polygenic selection,” Genetics, vol. 210, no. 4. Genetics Society of America,
pp. 1411–1427, 2018.
ista: Sachdeva H, Barton NH. 2018. Replicability of introgression under linked,
polygenic selection. Genetics. 210(4), 1411–1427.
mla: Sachdeva, Himani, and Nicholas H. Barton. “Replicability of Introgression under
Linked, Polygenic Selection.” Genetics, vol. 210, no. 4, Genetics Society
of America, 2018, pp. 1411–27, doi:10.1534/genetics.118.301429.
short: H. Sachdeva, N.H. Barton, Genetics 210 (2018) 1411–1427.
date_created: 2018-12-11T11:44:18Z
date_published: 2018-12-04T00:00:00Z
date_updated: 2023-09-18T08:10:29Z
day: '04'
department:
- _id: NiBa
doi: 10.1534/genetics.118.301429
external_id:
isi:
- '000452315900021'
intvolume: ' 210'
isi: 1
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.biorxiv.org/content/10.1101/379578v1
month: '12'
oa: 1
oa_version: Preprint
page: 1411-1427
publication: Genetics
publication_identifier:
issn:
- '00166731'
publication_status: published
publisher: Genetics Society of America
quality_controlled: '1'
scopus_import: '1'
status: public
title: Replicability of introgression under linked, polygenic selection
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 210
year: '2018'
...
---
_id: '38'
abstract:
- lang: eng
text: 'Genomes of closely-related species or populations often display localized
regions of enhanced relative sequence divergence, termed genomic islands. It has
been proposed that these islands arise through selective sweeps and/or barriers
to gene flow. Here, we genetically dissect a genomic island that controls flower
color pattern differences between two subspecies of Antirrhinum majus, A.m.striatum
and A.m.pseudomajus, and relate it to clinal variation across a natural hybrid
zone. We show that selective sweeps likely raised relative divergence at two tightly-linked
MYB-like transcription factors, leading to distinct flower patterns in the two
subspecies. The two patterns provide alternate floral guides and create a strong
barrier to gene flow where populations come into contact. This barrier affects
the selected flower color genes and tightlylinked loci, but does not extend outside
of this domain, allowing gene flow to lower relative divergence for the rest of
the chromosome. Thus, both selective sweeps and barriers to gene flow play a role
in shaping genomic islands: sweeps cause elevation in relative divergence, while
heterogeneous gene flow flattens the surrounding "sea," making the island of divergence
stand out. By showing how selective sweeps establish alternative adaptive phenotypes
that lead to barriers to gene flow, our study sheds light on possible mechanisms
leading to reproductive isolation and speciation.'
acknowledgement: ' ERC Grant 201252 (to N.H.B.)'
article_processing_charge: No
author:
- first_name: Hugo
full_name: Tavares, Hugo
last_name: Tavares
- first_name: Annabel
full_name: Whitley, Annabel
last_name: Whitley
- first_name: David
full_name: Field, David
id: 419049E2-F248-11E8-B48F-1D18A9856A87
last_name: Field
orcid: 0000-0002-4014-8478
- first_name: Desmond
full_name: Bradley, Desmond
last_name: Bradley
- first_name: Matthew
full_name: Couchman, Matthew
last_name: Couchman
- first_name: Lucy
full_name: Copsey, Lucy
last_name: Copsey
- first_name: Joane
full_name: Elleouet, Joane
last_name: Elleouet
- first_name: Monique
full_name: Burrus, Monique
last_name: Burrus
- first_name: Christophe
full_name: Andalo, Christophe
last_name: Andalo
- first_name: Miaomiao
full_name: Li, Miaomiao
last_name: Li
- first_name: Qun
full_name: Li, Qun
last_name: Li
- first_name: Yongbiao
full_name: Xue, Yongbiao
last_name: Xue
- first_name: Alexandra B
full_name: Rebocho, Alexandra B
last_name: Rebocho
- first_name: Nicholas H
full_name: Barton, Nicholas H
id: 4880FE40-F248-11E8-B48F-1D18A9856A87
last_name: Barton
orcid: 0000-0002-8548-5240
- first_name: Enrico
full_name: Coen, Enrico
last_name: Coen
citation:
ama: Tavares H, Whitley A, Field D, et al. Selection and gene flow shape genomic
islands that control floral guides. PNAS. 2018;115(43):11006-11011. doi:10.1073/pnas.1801832115
apa: Tavares, H., Whitley, A., Field, D., Bradley, D., Couchman, M., Copsey, L.,
… Coen, E. (2018). Selection and gene flow shape genomic islands that control
floral guides. PNAS. National Academy of Sciences. https://doi.org/10.1073/pnas.1801832115
chicago: Tavares, Hugo, Annabel Whitley, David Field, Desmond Bradley, Matthew Couchman,
Lucy Copsey, Joane Elleouet, et al. “Selection and Gene Flow Shape Genomic Islands
That Control Floral Guides.” PNAS. National Academy of Sciences, 2018.
https://doi.org/10.1073/pnas.1801832115.
ieee: H. Tavares et al., “Selection and gene flow shape genomic islands that
control floral guides,” PNAS, vol. 115, no. 43. National Academy of Sciences,
pp. 11006–11011, 2018.
ista: Tavares H, Whitley A, Field D, Bradley D, Couchman M, Copsey L, Elleouet J,
Burrus M, Andalo C, Li M, Li Q, Xue Y, Rebocho AB, Barton NH, Coen E. 2018. Selection
and gene flow shape genomic islands that control floral guides. PNAS. 115(43),
11006–11011.
mla: Tavares, Hugo, et al. “Selection and Gene Flow Shape Genomic Islands That Control
Floral Guides.” PNAS, vol. 115, no. 43, National Academy of Sciences, 2018,
pp. 11006–11, doi:10.1073/pnas.1801832115.
short: H. Tavares, A. Whitley, D. Field, D. Bradley, M. Couchman, L. Copsey, J.
Elleouet, M. Burrus, C. Andalo, M. Li, Q. Li, Y. Xue, A.B. Rebocho, N.H. Barton,
E. Coen, PNAS 115 (2018) 11006–11011.
date_created: 2018-12-11T11:44:18Z
date_published: 2018-10-23T00:00:00Z
date_updated: 2023-09-18T08:36:49Z
day: '23'
ddc:
- '570'
department:
- _id: NiBa
doi: 10.1073/pnas.1801832115
external_id:
isi:
- '000448040500065'
pmid:
- '30297406'
file:
- access_level: open_access
checksum: d2305d0cc81dbbe4c1c677d64ad6f6d1
content_type: application/pdf
creator: dernst
date_created: 2018-12-17T08:44:03Z
date_updated: 2020-07-14T12:46:16Z
file_id: '5683'
file_name: 11006.full.pdf
file_size: 1911302
relation: main_file
file_date_updated: 2020-07-14T12:46:16Z
has_accepted_license: '1'
intvolume: ' 115'
isi: 1
issue: '43'
language:
- iso: eng
month: '10'
oa: 1
oa_version: Published Version
page: 11006 - 11011
pmid: 1
publication: PNAS
publication_identifier:
issn:
- '00278424'
publication_status: published
publisher: National Academy of Sciences
publist_id: '8017'
quality_controlled: '1'
scopus_import: '1'
status: public
title: Selection and gene flow shape genomic islands that control floral guides
tmp:
image: /images/cc_by_nc_nd.png
legal_code_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
name: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
(CC BY-NC-ND 4.0)
short: CC BY-NC-ND (4.0)
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 115
year: '2018'
...
---
_id: '40'
abstract:
- lang: eng
text: Hanemaaijer et al. (Molecular Ecology, 27, 2018) describe the genetic consequences
of the introgression of an insecticide resistance allele into a mosquito population.
Linked alleles initially increased, but many of these later declined. It is hard
to determine whether this decline was due to counter‐selection, rather than simply
to chance.
article_processing_charge: Yes (via OA deal)
article_type: letter_note
author:
- first_name: Nicholas H
full_name: Barton, Nicholas H
id: 4880FE40-F248-11E8-B48F-1D18A9856A87
last_name: Barton
orcid: 0000-0002-8548-5240
citation:
ama: Barton NH. The consequences of an introgression event. Molecular Ecology.
2018;27(24):4973-4975. doi:10.1111/mec.14950
apa: Barton, N. H. (2018). The consequences of an introgression event. Molecular
Ecology. Wiley. https://doi.org/10.1111/mec.14950
chicago: Barton, Nicholas H. “The Consequences of an Introgression Event.” Molecular
Ecology. Wiley, 2018. https://doi.org/10.1111/mec.14950.
ieee: N. H. Barton, “The consequences of an introgression event,” Molecular Ecology,
vol. 27, no. 24. Wiley, pp. 4973–4975, 2018.
ista: Barton NH. 2018. The consequences of an introgression event. Molecular Ecology.
27(24), 4973–4975.
mla: Barton, Nicholas H. “The Consequences of an Introgression Event.” Molecular
Ecology, vol. 27, no. 24, Wiley, 2018, pp. 4973–75, doi:10.1111/mec.14950.
short: N.H. Barton, Molecular Ecology 27 (2018) 4973–4975.
date_created: 2018-12-11T11:44:18Z
date_published: 2018-12-31T00:00:00Z
date_updated: 2023-09-19T10:06:08Z
day: '31'
ddc:
- '576'
department:
- _id: NiBa
doi: 10.1111/mec.14950
external_id:
isi:
- '000454600500001'
pmid:
- '30599087'
file:
- access_level: open_access
content_type: application/pdf
creator: apreinsp
date_created: 2019-07-19T06:54:46Z
date_updated: 2020-07-14T12:46:22Z
file_id: '6652'
file_name: 2018_MolecularEcology_BartonNick.pdf
file_size: 295452
relation: main_file
file_date_updated: 2020-07-14T12:46:22Z
has_accepted_license: '1'
intvolume: ' 27'
isi: 1
issue: '24'
language:
- iso: eng
month: '12'
oa: 1
oa_version: Published Version
page: 4973-4975
pmid: 1
publication: Molecular Ecology
publication_identifier:
issn:
- 1365294X
publication_status: published
publisher: Wiley
publist_id: '8014'
quality_controlled: '1'
related_material:
record:
- id: '9805'
relation: research_data
status: public
scopus_import: '1'
status: public
title: The consequences of an introgression event
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 27
year: '2018'
...
---
_id: '565'
abstract:
- lang: eng
text: 'We re-examine the model of Kirkpatrick and Barton for the spread of an inversion
into a local population. This model assumes that local selection maintains alleles
at two or more loci, despite immigration of alternative alleles at these loci
from another population. We show that an inversion is favored because it prevents
the breakdown of linkage disequilibrium generated by migration; the selective
advantage of an inversion is proportional to the amount of recombination between
the loci involved, as in other cases where inversions are selected for. We derive
expressions for the rate of spread of an inversion; when the loci covered by the
inversion are tightly linked, these conditions deviate substantially from those
proposed previously, and imply that an inversion can then have only a small advantage. '
article_processing_charge: No
article_type: original
author:
- first_name: Brian
full_name: Charlesworth, Brian
last_name: Charlesworth
- first_name: Nicholas H
full_name: Barton, Nicholas H
id: 4880FE40-F248-11E8-B48F-1D18A9856A87
last_name: Barton
orcid: 0000-0002-8548-5240
citation:
ama: Charlesworth B, Barton NH. The spread of an inversion with migration and selection.
Genetics. 2018;208(1):377-382. doi:10.1534/genetics.117.300426
apa: Charlesworth, B., & Barton, N. H. (2018). The spread of an inversion with
migration and selection. Genetics. Genetics . https://doi.org/10.1534/genetics.117.300426
chicago: Charlesworth, Brian, and Nicholas H Barton. “The Spread of an Inversion
with Migration and Selection.” Genetics. Genetics , 2018. https://doi.org/10.1534/genetics.117.300426.
ieee: B. Charlesworth and N. H. Barton, “The spread of an inversion with migration
and selection,” Genetics, vol. 208, no. 1. Genetics , pp. 377–382, 2018.
ista: Charlesworth B, Barton NH. 2018. The spread of an inversion with migration
and selection. Genetics. 208(1), 377–382.
mla: Charlesworth, Brian, and Nicholas H. Barton. “The Spread of an Inversion with
Migration and Selection.” Genetics, vol. 208, no. 1, Genetics , 2018, pp.
377–82, doi:10.1534/genetics.117.300426.
short: B. Charlesworth, N.H. Barton, Genetics 208 (2018) 377–382.
date_created: 2018-12-11T11:47:12Z
date_published: 2018-01-01T00:00:00Z
date_updated: 2023-09-19T10:12:31Z
day: '01'
department:
- _id: NiBa
doi: 10.1534/genetics.117.300426
external_id:
isi:
- '000419356300025'
pmid:
- '29158424'
intvolume: ' 208'
isi: 1
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5753870/
month: '01'
oa: 1
oa_version: Published Version
page: 377 - 382
pmid: 1
publication: Genetics
publication_status: published
publisher: 'Genetics '
publist_id: '7249'
quality_controlled: '1'
scopus_import: '1'
status: public
title: The spread of an inversion with migration and selection
type: journal_article
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
volume: 208
year: '2018'
...