4th B Chromosome Conference

July 20th-23rd, 2019 – Botucatu, Brazil


Saturday, 20 July – 2019

Session 1 – Education in chromosome Science

13:30-17:00 Hands on science: obtention, visualization, and analyses of human chromosomes

Adriane P Wasko and Ligia SLS Mota, São Paulo State University (UNESP), Botucatu, Brazil

15:00 Registration and mounting of posters

18:00 Opening ceremony

18:15 Key note talk – The history of B chromosomes

Neil Jones, Aberystwyth University, Aberystwyth, UK

19:00 Welcome reception

Sunday, 21 July – 2019

Session 2 – Structure, composition and evolution of B chromosomes

Chairs: Robert Trivers and Terezie Mandakova

09:00 Recent progress in understanding B chromosome evolution

Robert Trivers, Chapman University, Orange, USA

09:30 The origin and evolution of apomixis-related chromosomes in Boechera (Brassicaceae)

Terezie Mandakova, Masaryk University, Brno, Czech Republic

10:00 Cichlid fish in the B chromosome world

Cesar Martins, São Paulo State University (UNESP), Botucatu, Brazil

10:15 Do B chromosomes survive speciation events?

Ana Beatriz S M Ferretti, São Paulo State University (UNESP), Rio Claro, Brazil

10:30 Coffee break and poster presentation

11:00 Origin and evolution of mammalian B chromosomes

Vladimir Trifonov, Novosibirsk State University/Russian Academy of Sciences, Novosibirsk, Russia

11:30 Unusual low abundance of repetitive DNAs in the supernumerary chromosome of Abracris flavolineata revealed by genome and chromosomal analysis

Diogo Milani, São Paulo State University (UNESP), Rio Claro, Brazil

11:45 From bacterium to B chromosome: Analysis of a B chromosome in the Mediterranean flour moth, Ephestia kuehniella, revealed an unusual case of horizontal gene transfer

Anna Voleníková, Czech Academy of Sciences, České Budějovice, Czech Republic

12:00 The history of Cestrum (Solanaceae) B-chromosomes reveals intense rearrangements in the repetitive DNA families, with conservation of chromosomes morphology and size

André L L Vanzela, Londrina State University (UEL), Londrina, Brazil

12:30 Lunch break

14:00 Holocentric B chromosomes in animals

Diogo C Cabral-de-Mello, São Paulo State University (UNESP), Rio Claro, Brazil

14:30 On the origin of the Drosophila Y chromosome

Antônio Bernardo Carvalho, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil

15:00 What is the repeat composition of holocentric B chromosomes? The case of Aetalion reticulatum

Vanessa B Bardella, São Paulo State University (UNESP), Rio Claro, Brazil

15:15 A big puzzle named B chromosomes in Partamona bees

Vander C Tosta, Espirito Santo Federal University (UFES), São Mateus, Brazil

Session 3 – Genes and B chromosome effects

Chair: Patrick Ferree

15:30 A B chromosome and a bacterial symbiont induce genome elimination in the jewel wasp, Nasonia vitripennis, through a similar chromatin mechanism

Patrick Ferree, Claremont McKenna College, Claremont, USA

16:00 Status of B chromosomes’ transcriptional activity in yellow-necked mouse Apodemus flavicollis

Marija Rajičić, University of Belgrade, Belgrade, Serbia

16:15 Coffee break and poster presentation

16:45 The impact of omics analyses in the modern view of B chromosomes

Syed F Ahmad, São Paulo State University (UNESP), Botucatu, Brazil

17:00 lncRNAs characterization in A. latifasciata and B effects over cell regulation molecules

Erica Ramos, São Paulo State University (UNESP), Botucatu, Brazil

17:15 The B chromosome of Lake Malawi Cichlids: reversing sex for selfish gain

Frances “Betsy” Clark, University of Maryland (UMD), College Park, USA

17:30 The participants’ football match

20:00 Get together – An invitation to Quiprocó Bar

Monday, 22 July – 2019

09:00 Composition and gene expression of B chromosomes in Astyanax tetra fish: common origin and parasitic behavior

Duilio MZA Silva, São Paulo State University (UNESP), Botucatu, Brazil

09:30 B chromosome contains a PIWI-Interacting RNA (piRNA) machinery that maintain the genomic integrity

Jordana I N Oliveira, São Paulo State University (UNESP), Botucatu, Brazil

Session 4 – Population genetics of B chromosomes

Chair: Vladimir Trifonov

09:45 Are there B-chromosomes in human?

Ahmed Al-Rikabi, Institute of Human Genetics, University Clinic Jena, Jena, Germany

10:15 Analyses of cytotype and genetic variations in association with geographical distributions of B chromosome aneuploids in Lilium amabile Palibin

Nam-Soo Kim, Shamyook University (Seoul)/Kangwon National University (Chuncheon), Korea

10:30 Coffee break and poster presentation

11:00 Cytogenomics highlights the molecular evolution of the B in the grasshopper Abracris flavolineata at population level

Ana Elisa Gasparotto, São Paulo State University (UNESP), Rio Claro, Brazil

Session 5 – Segregation behavior and drive of B chromosomes

Chair: Andreas Houben

11:15 B chromosomes – a matter of chromosome drive

Andreas Houben, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany

11:45 Catching transcripts involved in the process of B chromosome drive

Anastassia Boudichesvskaia, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany

12:00 Aegilops speltoides B chromosomes and the process of their organ-specific elimination

Alevtina Ruban, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany

12:15 Lunch Break

13:45 Tour “Botucatu Cuesta”, a trip around the town

20:00 Conference dinner, Celeiro Restaurant

Tuesday, 23 July- 2019

09:00 Studies on the mitotic drive mechanism of the maize B chromosome facilitated by sequence data

James Birchler, University of Missouri, Columbia, USA

09:30 Flow cytometric estimation of the B chromosome transmission rate in pollen grains of the wild wheat Aegilops speltoides

Joerg Fuchs, Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany

09:45 Meiotic drive of B chromosomes in Drosophila melanogaster

Stacey Hanlon, Stowers Institute for Medical Research, Kansas City, USA

10:15 B chromosomes are preferentially expulsed in comparison to A chromosomes during spermatogenesis in Abracris flavolineata

Lucas Albuquerque, São Paulo State University (UNESP), Rio Claro, Brazil

10:30 Coffee break

11:00 Behavior of a holocentric chromosome during spermatogenesis

Emiliano Martí, São Paulo State University (UNESP), Rio Claro, Brazil

11:15 Meiotic drive of female-inherited accessory chromosomes in a plant pathogenic fungus

Michael Habig, Christian-Albrechts University of Kiel, Kiel, Germany

Session 6 – New technologies and applications of B chromosomes

Chair: Elena Dalla Benetta

11:45 Leveraging long read sequencing technologies to assemble the selfish B chromosome in Nasonia vitripennis

Igor Antoshechkin, California Institute of Technology (CALTECH), Pasadena, USA

12:15 Identifying the toxin that causes paternal genome elimination by B chromosome PSR in Nasonia vitripennis

Elena Dalla Benetta, Claremont McKenna College, Claremont, USA

12:45 Closing remarks

13:00 Lunch