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High fidelity epigenetic inheritance: Information theoretic model predicts threshold filling of histone modifications post replication
During cell devision, maintaining the epigenetic information encoded in histone modification patterns is crucial for survival and identity of cells. The faithful inheritance of the histone marks from the parental to the daughter strands is a puzzle, given that each strand gets only half of the paren...
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Published in: | PLoS computational biology 2022-02, Vol.18 (2), p.e1009861-e1009861 |
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description | During cell devision, maintaining the epigenetic information encoded in histone modification patterns is crucial for survival and identity of cells. The faithful inheritance of the histone marks from the parental to the daughter strands is a puzzle, given that each strand gets only half of the parental nucleosomes. Mapping DNA replication and reconstruction of modifications to equivalent problems in communication of information, we ask how well enzymes can recover the parental modifications, if they were ideal computing machines. Studying a parameter regime where realistic enzymes can function, our analysis predicts that enzymes may implement a critical threshold filling algorithm which fills unmodified regions of length at most k. This algorithm, motivated from communication theory, is derived from the maximum à posteriori probability (MAP) decoding which identifies the most probable modification sequence based on available observations. Simulations using our method produce modification patterns similar to what has been observed in recent experiments. We also show that our results can be naturally extended to explain inheritance of spatially distinct antagonistic modifications. |
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The faithful inheritance of the histone marks from the parental to the daughter strands is a puzzle, given that each strand gets only half of the parental nucleosomes. Mapping DNA replication and reconstruction of modifications to equivalent problems in communication of information, we ask how well enzymes can recover the parental modifications, if they were ideal computing machines. Studying a parameter regime where realistic enzymes can function, our analysis predicts that enzymes may implement a critical threshold filling algorithm which fills unmodified regions of length at most k. This algorithm, motivated from communication theory, is derived from the maximum à posteriori probability (MAP) decoding which identifies the most probable modification sequence based on available observations. Simulations using our method produce modification patterns similar to what has been observed in recent experiments. We also show that our results can be naturally extended to explain inheritance of spatially distinct antagonistic modifications.</description><identifier>ISSN: 1553-7358</identifier><identifier>ISSN: 1553-734X</identifier><identifier>EISSN: 1553-7358</identifier><identifier>DOI: 10.1371/journal.pcbi.1009861</identifier><identifier>PMID: 35176029</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Algorithms ; Biology and Life Sciences ; Cell survival ; Chromatin ; Communication theory ; Deoxyribonucleic acid ; DNA ; DNA biosynthesis ; DNA replication ; DNA Replication - genetics ; Earth Sciences ; Enzymes ; Epigenesis, Genetic - genetics ; Epigenetic inheritance ; Epigenetics ; Gene expression ; Genetic aspects ; Genetic research ; Heredity ; Histone Code - genetics ; Histones ; Histones - genetics ; Histones - metabolism ; Information theory ; Inheritance Patterns ; Markov analysis ; Noise ; Nucleosomes ; Nucleosomes - genetics ; Parameter modification ; Physical Sciences ; Proteins ; Replication ; Research and Analysis Methods</subject><ispartof>PLoS computational biology, 2022-02, Vol.18 (2), p.e1009861-e1009861</ispartof><rights>COPYRIGHT 2022 Public Library of Science</rights><rights>2022 Ramakrishnan et al. 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The faithful inheritance of the histone marks from the parental to the daughter strands is a puzzle, given that each strand gets only half of the parental nucleosomes. Mapping DNA replication and reconstruction of modifications to equivalent problems in communication of information, we ask how well enzymes can recover the parental modifications, if they were ideal computing machines. Studying a parameter regime where realistic enzymes can function, our analysis predicts that enzymes may implement a critical threshold filling algorithm which fills unmodified regions of length at most k. This algorithm, motivated from communication theory, is derived from the maximum à posteriori probability (MAP) decoding which identifies the most probable modification sequence based on available observations. Simulations using our method produce modification patterns similar to what has been observed in recent experiments. We also show that our results can be naturally extended to explain inheritance of spatially distinct antagonistic modifications.</description><subject>Algorithms</subject><subject>Biology and Life Sciences</subject><subject>Cell survival</subject><subject>Chromatin</subject><subject>Communication theory</subject><subject>Deoxyribonucleic acid</subject><subject>DNA</subject><subject>DNA biosynthesis</subject><subject>DNA replication</subject><subject>DNA Replication - genetics</subject><subject>Earth Sciences</subject><subject>Enzymes</subject><subject>Epigenesis, Genetic - genetics</subject><subject>Epigenetic inheritance</subject><subject>Epigenetics</subject><subject>Gene expression</subject><subject>Genetic aspects</subject><subject>Genetic research</subject><subject>Heredity</subject><subject>Histone Code - genetics</subject><subject>Histones</subject><subject>Histones - genetics</subject><subject>Histones - metabolism</subject><subject>Information theory</subject><subject>Inheritance Patterns</subject><subject>Markov analysis</subject><subject>Noise</subject><subject>Nucleosomes</subject><subject>Nucleosomes - 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subjects | Algorithms Biology and Life Sciences Cell survival Chromatin Communication theory Deoxyribonucleic acid DNA DNA biosynthesis DNA replication DNA Replication - genetics Earth Sciences Enzymes Epigenesis, Genetic - genetics Epigenetic inheritance Epigenetics Gene expression Genetic aspects Genetic research Heredity Histone Code - genetics Histones Histones - genetics Histones - metabolism Information theory Inheritance Patterns Markov analysis Noise Nucleosomes Nucleosomes - genetics Parameter modification Physical Sciences Proteins Replication Research and Analysis Methods |
title | High fidelity epigenetic inheritance: Information theoretic model predicts threshold filling of histone modifications post replication |
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