Tag: Gene expression

SmF is one of the seven canonical Sm proteins that form the structural core of several spliceosomal snRNPs. This article explains SmF structure and function, its role in Sm ring formation and snRNP assembly, and its relationship with U1 snRNP and RNA splicing.

Translation termination is the final stage of protein synthesis in which ribosomes recognize stop codons, recruit release factors, release completed proteins, and recycle their subunits. Learn how UAA, UAG, and UGA stop codons work, how release factors trigger protein release, and how cells control premature termination and translation quality.

RNA is a versatile nucleic acid involved in gene expression, protein synthesis, regulation, and catalysis. Explore RNA structure, nucleotide composition, base pairing, folding, RNA types, processing, and biological functions.

Epigenetic mutations and changes alter gene regulation without necessarily changing the DNA sequence. Learn about DNA methylation, histone modifications, chromatin remodeling, gene expression, disease, cancer, and epigenetic testing.

Regulatory mutations alter DNA regions that control gene expression. Learn about promoter, enhancer, silencer, and other regulatory mutations and their effects on genes, development, genetic disorders, and cancer.

Constitutive and facultative heterochromatin are two forms of condensed chromatin with distinct properties and functions. Compare their stability, gene activity, genomic locations, epigenetic marks, and roles in chromosome organization and gene regulation.

Heterochromatin is a relatively compact form of chromatin associated with reduced DNA accessibility and transcriptional activity. Learn about constitutive and facultative heterochromatin, histone modifications, DNA methylation, chromosome organization, gene regulation, and genome stability.

Euchromatin is a relatively open and accessible form of chromatin associated with active or potentially active genes. Learn about its structure, histone modifications, chromatin accessibility, gene regulation, DNA replication, cell differentiation, and relationship with heterochromatin.

Chromatin is the DNA-protein complex that organizes genetic material inside eukaryotic cells and plays a central role in gene regulation. This article provides an overview of chromatin structure, nucleosomes, histone proteins, euchromatin, heterochromatin, epigenetic regulation, chromatin remodeling, and chromosome organization, while explaining how chromatin influences gene expression, DNA replication, DNA repair, and genetics.

U1-70K is an important protein component of U1 snRNP that supports the early stages of spliceosome assembly and 5′ splice-site recognition. Explore its structure, interactions, role in RNA splicing, and relevance to abnormal splicing.

Mutually exclusive exons are a specialized form of alternative RNA splicing in which a mature RNA transcript contains one exon from a pair or group while excluding the others. This mechanism allows cells to regulate gene expression and generate different RNA transcripts and protein isoforms from the same gene.

U1 snRNA is the RNA component of U1 snRNP and plays a key role in recognizing the 5′ splice site during pre-mRNA splicing. Explore its structure, sequence, RNA-RNA base pairing, spliceosome function, and role in alternative splicing.

U1 snRNP is an early component of the spliceosome that recognizes the 5′ splice site of pre-mRNA. Learn how U1 snRNA and associated proteins help initiate spliceosome assembly, regulate splice-site selection, and support accurate RNA splicing.

The 5′ splice site, also called the donor splice site, marks the beginning of an intron and helps U1 snRNP recognize the correct RNA-splicing boundary. Learn how it works with the spliceosome, branch point, and 3′ splice site during intron removal.

U2AF is an important RNA-splicing factor that helps recognize the 3′ end of many introns. Learn how U2AF65 and U2AF35 interact with the polypyrimidine tract and 3′ splice site and help coordinate spliceosome assembly during pre-mRNA processing.