Biomaterial Database

No X-chromosome dosage compensation in human proteomes. 2015

Xiaoshu Chen, and Jianzhi Zhang

Department of Ecology and Evolutionary Biology, University of Michigan.

The X and Y chromosomes of placental and marsupial mammals originated from a pair of autosomes. Ohno proposed that the expression levels of X-linked genes must have been doubled in males to compensate for the degeneration of their Y homologs. Recent mRNA sequencing experiments, however, found at most weak or infrequent X-chromosome dosage compensation. Nonetheless, dosage compensation need not occur at the mRNA level, because ultimately it is the protein concentration that matters. Analyzing human proteomic data from 22 tissues, we here report that X upregulation is absent at the protein level, indicating that Ohno's hypothesis is also invalid at the protein level.

UI	MeSH Term	Description	Entries
D004303	Dosage Compensation, Genetic	Genetic mechanisms that allow GENES to be expressed at a similar level irrespective of their GENE DOSAGE. This term is usually used in discussing genes that lie on the SEX CHROMOSOMES. Because the sex chromosomes are only partially homologous, there is a different copy number, i.e., dosage, of these genes in males vs. females. In DROSOPHILA, dosage compensation is accomplished by hypertranscription of genes located on the X CHROMOSOME. In mammals, dosage compensation of X chromosome genes is accomplished by random X CHROMOSOME INACTIVATION of one of the two X chromosomes in the female.	Dosage Compensation (Genetics),Gene Dosage Compensation,Hypertranscription, X-Chromosome,X-Chromosome Hypertranscription,Compensation, Dosage (Genetics),Compensation, Gene Dosage,Compensation, Genetic Dosage,Dosage Compensation, Gene,Gene Dosage Compensations,Genetic Dosage Compensation,Genetic Dosage Compensations,Hypertranscription, X Chromosome,X Chromosome Hypertranscription
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012333	RNA, Messenger	RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end, referred to as the poly(A) tail. The function of this tail is not known for certain, but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm.	Messenger RNA,Messenger RNA, Polyadenylated,Poly(A) Tail,Poly(A)+ RNA,Poly(A)+ mRNA,RNA, Messenger, Polyadenylated,RNA, Polyadenylated,mRNA,mRNA, Non-Polyadenylated,mRNA, Polyadenylated,Non-Polyadenylated mRNA,Poly(A) RNA,Polyadenylated mRNA,Non Polyadenylated mRNA,Polyadenylated Messenger RNA,Polyadenylated RNA,RNA, Polyadenylated Messenger,mRNA, Non Polyadenylated
D015854	Up-Regulation	A positive regulatory effect on physiological processes at the molecular, cellular, or systemic level. At the molecular level, the major regulatory sites include membrane receptors, genes (GENE EXPRESSION REGULATION), mRNAs (RNA, MESSENGER), and proteins.	Receptor Up-Regulation,Upregulation,Up-Regulation (Physiology),Up Regulation
D049951	X Chromosome Inactivation	A dosage compensation process occurring at an early embryonic stage in mammalian development whereby, at random, one X CHROMOSOME of the pair is repressed in the somatic cells of females.	X Inactivation,Lyon Hypothesis,Lyonization,X-Inactivation,Chromosome Inactivation, X,Hypothesis, Lyon,Inactivation, X,Inactivation, X Chromosome,X Inactivations
D050172	Genes, X-Linked	Genes that are located on the X CHROMOSOME.	X-Chromosome Genes,X-Linked Genes,X-Linked Traits,Alleles, X-Linked,Genes, X-Chromosome,Inheritance, X-Linked,Traits, X-Linked,X-Linked Inheritance,Allele, X-Linked,Alleles, X Linked,Gene, X-Chromosome,Gene, X-Linked,Genes, X Chromosome,Genes, X Linked,Inheritance, X Linked,Trait, X-Linked,Traits, X Linked,X Chromosome Genes,X Linked Genes,X Linked Inheritance,X Linked Traits,X-Chromosome Gene,X-Linked Allele,X-Linked Alleles,X-Linked Gene,X-Linked Trait
D020543	Proteome	The protein complement of an organism coded for by its genome.	Proteomes
D020869	Gene Expression Profiling	The determination of the pattern of genes expressed at the level of GENETIC TRANSCRIPTION, under specific circumstances or in a specific cell.	Gene Expression Analysis,Gene Expression Pattern Analysis,Transcript Expression Analysis,Transcriptome Profiling,Transcriptomics,mRNA Differential Display,Gene Expression Monitoring,Transcriptome Analysis,Analyses, Gene Expression,Analyses, Transcript Expression,Analyses, Transcriptome,Analysis, Gene Expression,Analysis, Transcript Expression,Analysis, Transcriptome,Differential Display, mRNA,Differential Displays, mRNA,Expression Analyses, Gene,Expression Analysis, Gene,Gene Expression Analyses,Gene Expression Monitorings,Gene Expression Profilings,Monitoring, Gene Expression,Monitorings, Gene Expression,Profiling, Gene Expression,Profiling, Transcriptome,Profilings, Gene Expression,Profilings, Transcriptome,Transcript Expression Analyses,Transcriptome Analyses,Transcriptome Profilings,mRNA Differential Displays
D023281	Genomics	The systematic study of the complete DNA sequences (GENOME) of organisms. Included is construction of complete genetic, physical, and transcript maps, and the analysis of this structural genomic information on a global scale such as in GENOME WIDE ASSOCIATION STUDIES.	Functional Genomics,Structural Genomics,Comparative Genomics,Genomics, Comparative,Genomics, Functional,Genomics, Structural
D040901	Proteomics	The systematic study of the complete complement of proteins (PROTEOME) of organisms.	Peptidomics