The Case for Transgenerational Epigenetic Inheritance in Humans
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Paramutation Alters Regulatory Control of the Maize Pl Locus
Copyright 2000 by the Genetics Society of America Paramutation Alters Regulatory Control of the Maize pl Locus Jay B. Hollick,*,1 Garth I. Patterson,*,2 Ingrid M. Asmundsson*,3 and Vicki L. Chandler² *Institute of Molecular Biology, University of Oregon, Eugene, Oregon 97403-1229 and ²Department of Plant Sciences, University of Arizona, Tucson, Arizona 85721 Manuscript received October 14, 1999 Accepted for publication December 10, 1999 ABSTRACT The maize purple plant (pl) locus encodes a transcription factor required for anthocyanin pigment synthesis in vegetative and ¯oral tissues. The strongly expressed Pl-Rhoades (Pl-Rh) allele is unstable, spontaneously changing to weaker expression states (PlЈ) at low frequencies and exclusively changing to PlЈ in PlЈ/Pl-Rh heterozygotes. The weakly expressed PlЈ state is mitotically and meiotically stable, yet reversible. This type of allele-dependent, heritable alteration of gene control is called paramutation. Expression studies herein demonstrate that visible differences in anthocyanin pigment levels mirror pl RNA abundance and that pl paramutation is associated with reduced transcription of the pl gene. This transcriptional alteration is accompanied by acquisition of light-dependent regulation. Restriction endonu- clease mapping indicates that these changes in pl gene regulation are not associated with detectable DNA alterations or with extensive changes in cytosine methylation patterns. Genetic tests show that Pl-Blotched (Pl-Bh), a structurally similar pl allele encoding an identical pl RNA and PL protein, does not participate in pl paramutation. This result suggests that if cis-acting sequences are required for pl paramutation they are distinct from the protein coding and immediately adjacent regions. A model is discussed in which pl paramutation results in heritable changes of chromatin structure that fundamentally alter regulatory interactions occurring during plant development. -
13.2 News Feat Epigenetic
news feature Altered states Changes to the genome that don’t affect DNA sequence may help to explain differences between genetically identical twins. Might these ‘epigenetic’ phenomena also underlie common diseases? Carina Dennis investigates. arie and Jo — not their real names — are twins, genetically identical Mand raised in a happy home. Grow- ing up, both enjoyed sport and art, were equally good at school, and appeared simi- H. KING/CORBIS lar in almost every respect. But as adults, their lives and personalities diverged: in her early twenties, following episodes of hallucinations and delusions, Marie was diagnosed with schizophrenia. Such examples have long baffled geneti- cists. Despite sharing the same DNA and often the same environment, ‘identical’ twins can sometimes show striking differ- ences. Now some researchers are beginning to investigate whether subtle modifications to the genome that don’t alter its DNA sequence, known as epigenetic changes, may provide the answer. In doing so, they hope to shed light on the mysterious roots of com- mon diseases — such as schizophrenia and diabetes — that burden society as a whole. The idea that epigenetics underpins many of the world’s health scourges is still highly speculative. “Most geneticists believe that the essence of all human disease is related Spot the difference: colour-coded epigenetic microarrays could show why ‘identical’ twins aren’t the same. to DNA-sequence variation,” says Arturas Petronis, a psychiatrist at the University of important epigenetic mechanism. Inside the stumbled into the subject from conventional Toronto in Canada. But with the genomics nucleus, strands of DNA wrap around pro- genetics, discovering that the mutated gene revolution having yet to yield the hoped-for teins called histones, and then coil up for a rare condition exerts its effect by avalanche of genes that confer susceptibility again into a densely packed structure called influencing epigenetic modifications else- to common diseases, Petronis is not alone in chromatin. -
Frequent Paramutation-Like Features of Natural Epialleles in Tomato
bioRxiv preprint doi: https://doi.org/10.1101/177972; this version posted August 18, 2017. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. Frequent paramutation-like features of natural epialleles in tomato Quentin Gouil1,2, and David C. Baulcombe1, 1Department of Plant Sciences, University of Cambridge, Cambridge, UK 2Walter and Eliza Hall Institute of Medical Research, Parkville, Australia Freakish and rare or the tip of the iceberg? Both phrases establishment and/or maintenance of the epigenetic mark. have been used to refer to paramutation, an epigenetic drive Our interest in paramutation follows from an earlier study that contravenes Mendel’s first law of segregation. Although of sRNA in tomato lines in which homozygous regions were its underlying mechanisms are beginning to unravel, its under- introgressed from Solanum pennellii into Solanum lycoper- standing relies only on a few examples that may involve trans- sicum (cv. M82) (14). The resulting introgression lines (ILs) genes or artificially generated epialleles. By using DNA methy- each carry many loci at which sRNAs are more abundant than lation of introgression lines as an indication of past paramu- tation, we reveal that the paramutation-like properties of the in either parent: they are transgressive (15). To explain these H06 locus in hybrids of Solanum lycopersicum and a range of findings we invoked epigenetic mechanisms because, in some tomato relatives and cultivars depend on the timing of sRNA instances, there was hypermethylation of the genomic DNA production and conform to an RNA-directed mechanism. -
Heritability Estimates Obtained from Genome-Wide Association Studies (GWAS) Are Much Lower Than Those of Traditional Quantitative Methods
Dissolving the missing heritability problem Abstract: Heritability estimates obtained from genome-wide association studies (GWAS) are much lower than those of traditional quantitative methods. This phenomenon has been called the “missing heritability problem”. By analyzing and comparing GWAS and traditional quantitative methods, we first show that the estimates obtained from the latter involve some terms other than additive genetic variance, while the estimates from the former do not. Second, GWAS, when used to estimate heritability, do not take into account additive epigenetic factors transmitted across generations, while traditional quantitative methods do. Given these two points we show that the missing heritability problem can largely be dissolved. Pierrick Bourrat* Macquarie University, Department of Philosophy North Ryde, NSW 2109, Australia Email: [email protected] The University of Sydney, Department of Philosophy, Unit for the History and Philosophy of Science & Charles Perkins Centre Camperdown, NSW 2006, Australia Qiaoying Lu* Sun Yat-sen University, Department of Philosophy Xingangxi Road 135 Guangzhou, Guangdong, China * PB and QL contributed equally to this work. Acknowledgements We are thankful to Steve Downes, Paul Griffiths and Eva Jablonka for discussions on the topic. PB’s research was supported under Australian Research Council's Discovery Projects funding scheme (project DP150102875). QL’s research was supported by a grant from the Ministry of Education of China (13JDZ004) and “Three Big Constructions” funds of Sun Yat-sen University. Dissolving the missing heritability problem Abstract: Heritability estimates obtained from genome-wide association studies (GWAS) are much lower than those of traditional quantitative methods. This phenomenon has been called the “missing heritability problem”. -
CV Marnie Blewitt
CURRICULUM VITAE – Marnie Elisabeth Blewitt Current Employment Laboratory head and ARC QEII fellow, Division of Molecular Medicine, Walter and Eliza Hall Institute. January 2010- December 2014 Honorary Member of Department of Genetics, University of Melbourne, January 2011, ongoing Honorary Member of Department of Medical Biology, University of Melbourne, January 2010, ongoing Previous Employment • Senior Research Officer and Peter Doherty Postdoctoral Fellow, Hilton Group, Division of Molecular Medicine, Walter and Eliza Hall Institute. August 2008- December 2009 • Research Officer and Peter Doherty Postdoctoral Fellow, Hilton Group, Division of Molecular Medicine, Walter and Eliza Hall Institute. October 2005-July 2008 • Post-doctoral Fellow for Associate Professor Emma Whitelaw, School of Molecular and Microbial Biosciences, University of Sydney, February 2005-October 2005 • Research Assistant for Dr Trevor Biden, Cell Signalling Group, Garvan Institute of Medical Research, August 2000-January 2001 • Strategy Consultant within Communications and High Technology Division, Andersen Consulting, January 2000-August 2000 Education • PhD in the Whitelaw Laboratory, School of Molecular and Microbial Biosciences, University of Sydney, (2001-2004). • B. Sc. (Molecular Biology and Genetics) Hons (First class and University Medal) at The University of Sydney, graduated 1999. Academic awards and Fellowships • JG Russell Award, Australian Academy of Science 2010 • Financial Review Boss Magazine Top 30 Women to Watch in Australian Business • The Age Melbourne Top 100 most influential people 2009 • ARC Queen Elizabeth II fellowship, DP1096092 “An RNA interference based genetic screen for novel epigenetic modifiers involved in mammalian X inactivation” 2010-2014 • Awarded NHMRC Career Development Award ID 637375 “An RNA interference screen for novel epigenetic modifiers involved in mammalian X inactivation, for 2010-2013, declined • L’Oreal Australia For Women in Science Fellowship, 2009. -
Disputing Lamarckian Epigenetic Inheritance in Mammals Emma Whitelaw
Whitelaw Genome Biology (2015) 16:60 DOI 10.1186/s13059-015-0626-0 RESEARCH HIGHLIGHT Open Access Disputing Lamarckian epigenetic inheritance in mammals Emma Whitelaw Please see related article: http://dx.doi.org/10.1186/s13059-015-0619-z The Lamarckian revival Abstract Lamarckian inheritance is the theory that an organism can A recent study finds that changes to transcription and pass on phenotypes that it acquired during its lifetime to its DNA methylation resulting from in utero exposure to offspring. This theory was first postulated at the start of the environmental endocrine-disrupting chemicals are not 19th century, but by the end of that century the model of inherited across generations. genetic inheritance, from Darwin and Mendel, became pre- ferred. Over the past decade, a handful of studies carried out in mammals have provided support for the idea that Epigenetic reprogramming exposure to environmental events can drive phenotypic All mammals develop from a single cell, the zygote, which changes that are inherited for more than one generation, is made up of an egg and a sperm head, both of which con- and that this occurs through epigenetic mechanisms. One tain a haploid genome. At the time of fertilization, the of the key studies driving recent support for Lamarckian in- DNA of both egg and sperm is packaged into chromatin, heritance[2]reportedthattheexposureofpregnantfemale and each has its own epigenetic (DNA methylation and rats to the endocrine disruptor vincozolin affected male fer- histone modification) ‘state’ related to the previous func- tility in subsequent generations and that these effects were tional requirements of these cell types. -
2000-Annual-Report.Pdf
Directors’ report / 2 IMB seminars / 78 Highlights 2000 / 6 Collaborations / 81 Group profiles / 9 Financial / 82 Joint ventures / 72 Publications / 84 Graduate program / 75 Staff list / 90 IMBcom / 76 Contents Genomics & Bioinformatics 9 Genetics & Developmental17 Biology Cell Biology 33 Structural Biology49 Biological Chemistry57 IMB Associates68 2 3 imb/2000 Professors John Mattick and Peter Andrews, Co-Directors of the Institute for Molecular Bioscience, talk with Peter McCutcheon Why is Queensland, which has Professor Andrews: The world’s most including industry. The IMB hosts traditionally relied on mining, rapidly growing economies are all the ARC Special Research Centre for agricultural and tourism industries, knowledge-based industries, and the Functional and Applied Genomics and developing an advanced research focus of those industries is increasingly is a core partner in the Cooperative centre for molecular bioscience? on biotechnology. In fact, recent Research Centre for the Discovery of advances in genetic engineering Genes for Common Human Diseases, as Professor Mattick: It is clear that we are techniques and the sequencing of the well as being the host (along with the in the midst of one of the greatest periods human genome have extended the Walter & Eliza Hall Institute of Medical of discovery in history – the genetic and applications of biotechnology from Research) of a major national research molecular basis of life and its diversity. common foodstuffs into most aspects of facility, the Australian Genome Research The genome projects are laying out the our lives, including medicine, energy and Facility. So we do have a good balanced genetic blueprints of different species, the environment. For me, the question is portfolio of research funding. -
Paramutation, an Allelic Interaction, Is Associated with a Stable and Heritable Reduction of Transcription of the Maize B Regulatory Gene
Copyright 0 1993 by the Genetics Society of America Paramutation, an Allelic Interaction, Is Associated With a Stable and Heritable Reduction of Transcription of the Maize b Regulatory Gene Garth I. Patterson, Christopher J. Thorpe and Vicki L. Chandler Institute of Molecular Biology, University of Oregon, Eugene, Oregon 97403 Manuscript received May 10, 1993 Accepted for publicationJuly 17, 1993 ABSTRACT The b gene of maize encodes a transcriptional activatorof anthocyanin pigment biosynthetic genes. Certain b alleles undergo paramutation: a unidirectional, heritable alterationof one allele causedby the presence of another allele. B-I (intensely pigmented plant) is always changed to B’ (weakly pigmented plant) in the B’/B-Z heterozygote, such that all progeny receive the B‘ allele. The “new” B’, which was B-I in the previous generation, is weakly pigmented and fully capable of changing another B-Z allele intoB’. It was not previously knownwhether paramutationis associated with altered b expression, altered B protein function or both. Our results show that B’ acts in trans to suppress the transcription of B-I, with transcription remaining low in subsequent generations,even when the original B’ allele segregates away. The products of B-Z and B’ are equally capable of activating the transcription of their target genes, indicating they are functionally equivalent. Genomic restriction maps, DNA sequence and methylationof B’ and B-I were compared. Despite dramatic differencesin phenotype and transcription of B’ and B-I, no evidence for rearrangements, changesin sequence or changes in methylation was found. These results provide no support for models involving “dominant negative” proteins, gene conversionor transposable element interactions.We suggest that b paramu- tation involves a physical interaction between the alleles that suppresses transcription and promotesa change in chromatin structure that is heritable. -
Paramutation: an Encounter Leaving a Lasting Impression
Review TRENDS in Plant Science Vol.10 No.6 June 2005 Paramutation: an encounter leaving a lasting impression Maike Stam1 and Ortrun Mittelsten Scheid2 1Swammerdam Institute for Life Sciences, Universiteit van Amsterdam, Kruislaan 318, 1098 SM Amsterdam, The Netherlands 2Gregor Mendel Institute of Molecular Plant Biology, Austrian Academy of Sciences, and University of Natural Resources and Applied Life Science, Muthgasse 18, A-1190 Vienna, Austria Paramutation is the result of heritable changes in gene associated with changes in transposition frequency [5], expression that occur upon interaction between alleles. transposition mechanism [6] or recombination [7].In Whereas Mendelian rules, together with the concept of addition, the term paramutation was recently applied to genetic transmission via the DNA sequence, can account trans inactivations between non-allelic homologous for most inheritance in sexually propagating organisms, sequences [8–10] but, for simplicity, we here use the paramutation-like phenomena challenge the exclusive- term ‘alleles’ for the interacting loci. ness of Mendelian inheritance. Most paramutation-like Paramutation alleles come in pairs of one ‘paramutable’ phenomena have been observed in plants but there is allele and one ‘paramutagenic’ allele (Figure 1b). The increasing evidence for its occurrence in other organ- paramutagenic allele provokes the change and conveys its isms, including mammals. Our knowledge of the own expression state, whereas the paramutable allele underlying mechanisms, which might involve RNA undergoes the epigenetic change and becomes a para- silencing, physical pairing of homologous chromosomal mutated allele, in genetic nomenclature often marked regions or both, is still limited. Here, we discuss the with a prime symbol (for example, R-r0). -
Transposable Elements: Are They Lynne Harris, University of Edinburgh Good for You After All? Ordinary Committee Members Genetics Society Sponsored Events 26 - 35 Dr
Issue 65.qxd:Genetic Society News 27/6/11 10:06 Page 1 JULYJULLYY 2011 | ISSUE 65 GENETICSGENNETICSS SOCIETYSOCIEETY NENEWSEWS In this issue The Genetics Society News is edited s Spring Meeting by David Hosken and items for futurfuturee s SponsoredSponsored Meetings Meetings issues can be sent to the editoreditor,, by email to [email protected]@exeter.ac.uk.exeter.ac.uk. s Summer Student and TravelTravel Reports The Newsletter is publishedblished twice a s 2012 AwardsAwards Announced Announced yearyear,, with copy dates of 1st June s Edinburghg 2012 and 26th NovemberNovember.. The 2012 Genetics SpringSprinng Meeting Supermodel Organisms: Chemical Genetics and Synthetic LifeLiffe See page 5 for registrationregistratiion information Issue 65.qxd:Genetic Society News 27/6/11 10:06 Page 2 A WORD FROM THE EDITOR A word from the editor Welcome to issue 65. interested, search for and read “Promiscuity is key to survival” As usual this issue is packed and then read the research full of interesting reports from underpinning it as one case in students, young researchers point. and we have meetings reports past and future! Thanks once Perhaps the quality of science again to all of those who kindly reporting is partly why non- contributed. As is usual in the scientists, and administrators Editorial, it’s time to wax in particular, think they should lyrical, and there are two and can direct research. This is themes I want to mention here, not new, but as public spending science journalism and cuts continue in the UK, calls to deciding who should determine direct research are becoming many headed shotgun approach the research to be funded by more vociferous, with because no one knows where the taxpayer, as in a way they bureaucrats rather than the next break through will be, are linked. -
The Molecular Cloning and Characterisation
THE MOLECULAR CLONING AND CHARACTERISATION OF NORMAL AND BETA-PLUS THALASSAEMIC HUMAN' GLOBIN GENES ' \ . ' by DAVID ANTHONY WESTAWAY a thesis submitted for the degree of Doctor of Philosophy in the University of London December, 1980 Department of Biochemistry St Mary's Hospital Medical School London W2 IPG VI ABSTRACT ^thalassaemia is a human hereditary diseases characterised by decreased output of p globin chains. Human & ~rp~r andy - globin cDNA plasmids, whose identity was confirmed by sequence analysis, were used to investigate the p- globin locus in j3 -thalassaemia. No gross alteration of the globin locus is associated-' with the disease. In order to identify the mutation conferring the thai phenotype, a chromosomal p globin gene has been cloned in phage lambda. Starting material was DNA from a Turkish Cypriot compound heterozygote, with a P gene .on one chromosome and a 6p fusion gene on the other chromosome. The DNA was digested with the restriction endonuclease Hsu 1 which generates a 7.5kb fragment from the p globin gene, and a 16kb fragment from the fusion gene. The Hsu 1 cleaved DNA was enriched for the 7.5kb size fraction and ligated to the lambda cloning vector ANEM788. 160,000 recombinants were screened and a positive scoring phage isolated. Restriction analysis confirmed that this phage contained a P globin gene. The 7.5kb insert was subcloned into the plasmid pAT153 and digestion with seven restriction endonucleases gave a pattern indistinguishable from that of a normal p globin gene. Thus within the 7.5kb of DNA cloned, which includes the p globin gene plus almost 6kb of flanking DNA, there have been no insertions or deletions greater than about 100 base-pairs. -
Paramutation: Just a Curiosity Or Fine Tuning of Gene Expression in the Next Generation?
298 Current Genomics, 2011, 12, 298-306 Paramutation: Just a Curiosity or Fine Tuning of Gene Expression in the Next Generation? Roberto Pilu* Dipartimento di Produzione Vegetale, Università degli Studi di Milano, Via Celoria 2, 20133 Milano, Italy Abstract: Gene silencing is associated with heritable changes in gene expression which occur without changes in DNA sequence. In eukaryotes these phenomena are common and control important processes, such as development, imprinting, viral and transposon sequence silencing, as well as transgene silencing. Among the epigenetic events, paramutation occurs when a silenced allele (named paramutagenic) is able to silence another allele (paramutable) in trans and this change is heritable. The silenced paramutable allele acquires paramutagenic capacity in the next generations. In the 1950s, Alexander Brink described for the first time the phenomenon of paramutation, occurring in maize at the colored1 (r1) gene, a complex locus (encoding myc-homologous transcription factors) that regulates the anthocyanin biosynthetic pathway. Since then, paramutation and paramutation-like interactions have been discovered in other plants and animals, suggesting that they may underlie important mechanisms for gene expression. The molecular bases of these phenomena are unknown. However in some cases, the event of paramutation has been correlated with changes in DNA methylation, chromatin structure and recently several studies suggest that RNA could play a fundamental role. This last consideration is greatly supported by genetic screening for mutants inhibiting paramutation, which allowed the identification of genes involved in RNA-directed transcriptional silencing, although it is possible that proteins are also required for paramutation. The meaning of paramutation in the life cycle and in evolution remains to be determined even though we might conjecture that this phenomenon could be involved in a fast heritability of favourable epigenetic states across generations in a non- Mendelian way.