The haplolethality paradox of the wupA gene in Drosophila

Haplolethals (HL) are regions of diploid genomes that in one dose are fatal for the organism. Their biological meaning is obscure because heterozygous loss-of-function mutations result in dominant lethality (DL) and, consequently, should be under strong negative selection. We report an in depth stud...

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Published inPLoS genetics Vol. 17; no. 3; p. e1009108
Main Authors Casas-Tintó, Sergio, Ferrús, Alberto
Format Journal Article
LanguageEnglish
Published United States Public Library of Science 19.03.2021
Public Library of Science (PLoS)
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ISSN1553-7404
1553-7390
1553-7404
DOI10.1371/journal.pgen.1009108

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Abstract Haplolethals (HL) are regions of diploid genomes that in one dose are fatal for the organism. Their biological meaning is obscure because heterozygous loss-of-function mutations result in dominant lethality (DL) and, consequently, should be under strong negative selection. We report an in depth study of the HL associated to the gene wings up A ( wupA ). It encodes 13 transcripts (A-M) that yield 11 protein isoforms (A-K) of Troponin I (TnI). They are functionally diverse in their control of muscle contraction, cell polarity and cell proliferation. Isoform K transfers to the nucleus where it increases transcription of the cell proliferation related genes CDK2 , CDK4 , Rap and Rab5 . The nuclear translocation of isoform K is prevented by the co-expression of A or B isoforms, which illustrates isoform interactions. The corresponding DL mutations are, either DNA rearrangements clustered towards the gene 3’ end, thus affecting the genomic organization of all transcripts, or CRISPR-induced mutations in one of the two ATG sites which eliminate a subset of wupA products. The joint elimination of isoforms C, F, G and H, however, do not cause DL phenotypes. Genetically driven expression of single isoforms rescue neither DL nor any of the mutants known in the gene, suggesting that normal function requires properly regulated expression of specific combinations, rather than single, TnI isoforms. We conclude that the wupA associated HL results from the combined haploinsufficiency of a large set of TnI isoforms. The qualitative and quantitative normal expression of which, requires the chromosomal integrity of the wupA genomic region. Since all fly TnI isoforms are encoded in the same gene, its HL condition becomes unavoidable. These wupA features are comparable to those of dpp , the only other HL studied to some extent, and reveal a scenario of strict dosage dependence with implications for gene expression regulation and splitting.
AbstractList Haplolethals (HL) are regions of diploid genomes that in one dose are fatal for the organism. Their biological meaning is obscure because heterozygous loss-of-function mutations result in dominant lethality (DL) and, consequently, should be under strong negative selection. We report an in depth study of the HL associated to the gene wings up A (wupA). It encodes 13 transcripts (A-M) that yield 11 protein isoforms (A-K) of Troponin I (TnI). They are functionally diverse in their control of muscle contraction, cell polarity and cell proliferation. Isoform K transfers to the nucleus where it increases transcription of the cell proliferation related genes CDK2, CDK4, Rap and Rab5. The nuclear translocation of isoform K is prevented by the co-expression of A or B isoforms, which illustrates isoform interactions. The corresponding DL mutations are, either DNA rearrangements clustered towards the gene 3' end, thus affecting the genomic organization of all transcripts, or CRISPR-induced mutations in one of the two ATG sites which eliminate a subset of wupA products. The joint elimination of isoforms C, F, G and H, however, do not cause DL phenotypes. Genetically driven expression of single isoforms rescue neither DL nor any of the mutants known in the gene, suggesting that normal function requires properly regulated expression of specific combinations, rather than single, TnI isoforms. We conclude that the wupA associated HL results from the combined haploinsufficiency of a large set of TnI isoforms. The qualitative and quantitative normal expression of which, requires the chromosomal integrity of the wupA genomic region. Since all fly TnI isoforms are encoded in the same gene, its HL condition becomes unavoidable. These wupA features are comparable to those of dpp, the only other HL studied to some extent, and reveal a scenario of strict dosage dependence with implications for gene expression regulation and splitting.
Haplolethals (HL) are regions of diploid genomes that in one dose are fatal for the organism. Their biological meaning is obscure because heterozygous loss-of-function mutations result in dominant lethality (DL) and, consequently, should be under strong negative selection. We report an in depth study of the HL associated to the gene wings up A (wupA). It encodes 13 transcripts (A-M) that yield 11 protein isoforms (A-K) of Troponin I (TnI). They are functionally diverse in their control of muscle contraction, cell polarity and cell proliferation. Isoform K transfers to the nucleus where it increases transcription of the cell proliferation related genes CDK2, CDK4, Rap and Rab5. The nuclear translocation of isoform K is prevented by the co-expression of A or B isoforms, which illustrates isoform interactions. The corresponding DL mutations are, either DNA rearrangements clustered towards the gene 3' end, thus affecting the genomic organization of all transcripts, or CRISPR-induced mutations in one of the two ATG sites which eliminate a subset of wupA products. The joint elimination of isoforms C, F, G and H, however, do not cause DL phenotypes. Genetically driven expression of single isoforms rescue neither DL nor any of the mutants known in the gene, suggesting that normal function requires properly regulated expression of specific combinations, rather than single, TnI isoforms. We conclude that the wupA associated HL results from the combined haploinsufficiency of a large set of TnI isoforms. The qualitative and quantitative normal expression of which, requires the chromosomal integrity of the wupA genomic region. Since all fly TnI isoforms are encoded in the same gene, its HL condition becomes unavoidable. These wupA features are comparable to those of dpp, the only other HL studied to some extent, and reveal a scenario of strict dosage dependence with implications for gene expression regulation and splitting.Haplolethals (HL) are regions of diploid genomes that in one dose are fatal for the organism. Their biological meaning is obscure because heterozygous loss-of-function mutations result in dominant lethality (DL) and, consequently, should be under strong negative selection. We report an in depth study of the HL associated to the gene wings up A (wupA). It encodes 13 transcripts (A-M) that yield 11 protein isoforms (A-K) of Troponin I (TnI). They are functionally diverse in their control of muscle contraction, cell polarity and cell proliferation. Isoform K transfers to the nucleus where it increases transcription of the cell proliferation related genes CDK2, CDK4, Rap and Rab5. The nuclear translocation of isoform K is prevented by the co-expression of A or B isoforms, which illustrates isoform interactions. The corresponding DL mutations are, either DNA rearrangements clustered towards the gene 3' end, thus affecting the genomic organization of all transcripts, or CRISPR-induced mutations in one of the two ATG sites which eliminate a subset of wupA products. The joint elimination of isoforms C, F, G and H, however, do not cause DL phenotypes. Genetically driven expression of single isoforms rescue neither DL nor any of the mutants known in the gene, suggesting that normal function requires properly regulated expression of specific combinations, rather than single, TnI isoforms. We conclude that the wupA associated HL results from the combined haploinsufficiency of a large set of TnI isoforms. The qualitative and quantitative normal expression of which, requires the chromosomal integrity of the wupA genomic region. Since all fly TnI isoforms are encoded in the same gene, its HL condition becomes unavoidable. These wupA features are comparable to those of dpp, the only other HL studied to some extent, and reveal a scenario of strict dosage dependence with implications for gene expression regulation and splitting.
In Drosophila, the seminal work by the groups of Lindsley and Sandler in 1972 [20], based on segmental aneuploidies covering 85% of its genome, provided the first estimation of HL regions, up to 20, one of them being haplo-, as well as, triplo-lethal (Tpl). Since organism survival is inversely proportional to the extent of the genetic material deleted, the HL condition could result from the additive insufficiency of several adjacent genes. [...]the estimated number of HL regions in flies has been reduced when smaller deletions have become available. Interestingly, the two 13 kb hobo inserts in the Hin region of dpp that had been reported, one of them landed in an intron, and the other did it in the 3’ untranslated region of exon 3 [23]. [...]the dpp associated haplolethality is currently understood as a dosage insufficiency of the single encoded protein, the morphogen DPP a.k.a. BMP in vertebrates. Remarkably, the Tpl region has proven also refractory to point mutations and only rearrangements were obtained [28]. Since the duplication required to isolate DL mutants in the 16F7 region, Dp(1;3R)JC153, also contains genes adjacent to wupA, the HL function could result from the combined insufficiency of several genes under the control of regulatory sequences located inside the wupA gene or, alternatively, from the haploinsufficiency of the wupA encoded protein, Troponin I (TnI).
Haplolethals (HL) are regions of diploid genomes that in one dose are fatal for the organism. Their biological meaning is obscure because heterozygous loss-of-function mutations result in dominant lethality (DL) and, consequently, should be under strong negative selection. We report an in depth study of the HL associated to the gene wings up A ( wupA ). It encodes 13 transcripts (A-M) that yield 11 protein isoforms (A-K) of Troponin I (TnI). They are functionally diverse in their control of muscle contraction, cell polarity and cell proliferation. Isoform K transfers to the nucleus where it increases transcription of the cell proliferation related genes CDK2 , CDK4 , Rap and Rab5 . The nuclear translocation of isoform K is prevented by the co-expression of A or B isoforms, which illustrates isoform interactions. The corresponding DL mutations are, either DNA rearrangements clustered towards the gene 3’ end, thus affecting the genomic organization of all transcripts, or CRISPR-induced mutations in one of the two ATG sites which eliminate a subset of wupA products. The joint elimination of isoforms C, F, G and H, however, do not cause DL phenotypes. Genetically driven expression of single isoforms rescue neither DL nor any of the mutants known in the gene, suggesting that normal function requires properly regulated expression of specific combinations, rather than single, TnI isoforms. We conclude that the wupA associated HL results from the combined haploinsufficiency of a large set of TnI isoforms. The qualitative and quantitative normal expression of which, requires the chromosomal integrity of the wupA genomic region. Since all fly TnI isoforms are encoded in the same gene, its HL condition becomes unavoidable. These wupA features are comparable to those of dpp , the only other HL studied to some extent, and reveal a scenario of strict dosage dependence with implications for gene expression regulation and splitting. Most species contain two copies of their genetic endowment, each received from each progenitor. If one of the duplicated genes is non-functional, the remaining copy may supply enough product as to cover the requirements for normal function or, alternatively, may reflect the insufficiency through a visible phenotype. In rare occasions, however, having one copy is so deleterious that causes lethality. These so called “haplolethal regions”, exist across species and represent an evolutionary paradox since they should have been subject to intense negative selection. The inherent difficulties to study haplolethals have precluded their study so far. Here, we analyzed the case of one of the five haplolethal regions of Drosophila , the one associated to the Troponin I encoding gene wupA , by measuring the transcriptional effects of mutations and chromosomal rearrangements affecting this gene. The data show that this haplolethality results from the combined insufficiency of a large number of Troponin I isoforms, which are functionally specialized, show interference and require the integrity of the native chromatin structure for their quantitatively regulated expression. These features unveil novel aspects of gene expression and, possibly, on evolutionary gene splitting. Also, haplolethals underscore the biological significance of protein dosage, in particular for functionally related products.
Haplolethals (HL) are regions of diploid genomes that in one dose are fatal for the organism. Their biological meaning is obscure because heterozygous loss-of-function mutations result in dominant lethality (DL) and, consequently, should be under strong negative selection. We report an in depth study of the HL associated to the gene wings up A ( wupA ). It encodes 13 transcripts (A-M) that yield 11 protein isoforms (A-K) of Troponin I (TnI). They are functionally diverse in their control of muscle contraction, cell polarity and cell proliferation. Isoform K transfers to the nucleus where it increases transcription of the cell proliferation related genes CDK2 , CDK4 , Rap and Rab5 . The nuclear translocation of isoform K is prevented by the co-expression of A or B isoforms, which illustrates isoform interactions. The corresponding DL mutations are, either DNA rearrangements clustered towards the gene 3’ end, thus affecting the genomic organization of all transcripts, or CRISPR-induced mutations in one of the two ATG sites which eliminate a subset of wupA products. The joint elimination of isoforms C, F, G and H, however, do not cause DL phenotypes. Genetically driven expression of single isoforms rescue neither DL nor any of the mutants known in the gene, suggesting that normal function requires properly regulated expression of specific combinations, rather than single, TnI isoforms. We conclude that the wupA associated HL results from the combined haploinsufficiency of a large set of TnI isoforms. The qualitative and quantitative normal expression of which, requires the chromosomal integrity of the wupA genomic region. Since all fly TnI isoforms are encoded in the same gene, its HL condition becomes unavoidable. These wupA features are comparable to those of dpp , the only other HL studied to some extent, and reveal a scenario of strict dosage dependence with implications for gene expression regulation and splitting.
In Drosophila, the seminal work by the groups of Lindsley and Sandler in 1972 [20], based on segmental aneuploidies covering 85% of its genome, provided the first estimation of HL regions, up to 20, one of them being haplo-, as well as, triplo-lethal (Tpl). Since organism survival is inversely proportional to the extent of the genetic material deleted, the HL condition could result from the additive insufficiency of several adjacent genes. [...]the estimated number of HL regions in flies has been reduced when smaller deletions have become available. Interestingly, the two 13 kb hobo inserts in the Hin region of dpp that had been reported, one of them landed in an intron, and the other did it in the 3’ untranslated region of exon 3 [23]. [...]the dpp associated haplolethality is currently understood as a dosage insufficiency of the single encoded protein, the morphogen DPP a.k.a. BMP in vertebrates. Remarkably, the Tpl region has proven also refractory to point mutations and only rearrangements were obtained [28]. Since the duplication required to isolate DL mutants in the 16F7 region, Dp(1;3R)JC153, also contains genes adjacent to wupA, the HL function could result from the combined insufficiency of several genes under the control of regulatory sequences located inside the wupA gene or, alternatively, from the haploinsufficiency of the wupA encoded protein, Troponin I (TnI).
Audience Academic
Author Ferrús, Alberto
Casas-Tintó, Sergio
AuthorAffiliation Stowers Institute for Medical Research, UNITED STATES
Instituto Cajal, Consejo Superior de Investigaciones Científicas, Madrid, Spain
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BackLink https://www.ncbi.nlm.nih.gov/pubmed/33739971$$D View this record in MEDLINE/PubMed
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CitedBy_id crossref_primary_10_1111_1744_7917_13403
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Cites_doi 10.1091/mbc.e03-09-0663
10.1016/j.devcel.2019.12.007
10.1093/genetics/79.4.589
10.1242/jcs.050880
10.1007/s00335-005-0045-8
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Snippet Haplolethals (HL) are regions of diploid genomes that in one dose are fatal for the organism. Their biological meaning is obscure because heterozygous...
In Drosophila, the seminal work by the groups of Lindsley and Sandler in 1972 [20], based on segmental aneuploidies covering 85% of its genome, provided the...
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SourceType Open Website
Open Access Repository
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Enrichment Source
StartPage e1009108
SubjectTerms 3' Untranslated regions
Analysis
Biology and Life Sciences
Bone morphogenetic proteins
Calcium-binding protein
Dosage
Drosophila
Ethanol
Genes
Genetic aspects
Genetic engineering
Genomes
Genotype & phenotype
Haploidy
Haploinsufficiency
Insects
Lethal mutation
Mutation
Proteins
Regulatory sequences
Research and Analysis Methods
Troponin
Troponin I
Wings (Animal)
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Title The haplolethality paradox of the wupA gene in Drosophila
URI https://www.ncbi.nlm.nih.gov/pubmed/33739971
https://www.proquest.com/docview/2513685644
https://www.proquest.com/docview/2503446163
https://pubmed.ncbi.nlm.nih.gov/PMC8011728
https://doaj.org/article/9f93c7c52a224709b9a30ae128991331
http://dx.doi.org/10.1371/journal.pgen.1009108
Volume 17
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