Cistron: Difference between revisions

Cistron
Symbol
HGNC ID
Alternative symbols	–
Entrez Gene
OMIM
RefSeq	–
UniProt	–
Chromosome	–
Locus supplementary data	–

Latest revision as of 17:34, 30 December 2024

A cistron is a segment of DNA that encodes a single polypeptide chain or protein. The term "cistron" is synonymous with "gene" in the context of molecular biology.

Structure and Function[edit]

A cistron is defined by its ability to produce a functional product, typically a protein, through the processes of transcription and translation. Each cistron contains a sequence of nucleotides that includes a promoter, a coding sequence, and a terminator.

Promoter[edit]

The promoter is a region of DNA that initiates transcription of a particular gene. Promoters are located near the transcription start sites of genes and can be about 100–1000 base pairs long.

Coding Sequence[edit]

The coding sequence of a cistron is the portion of a gene's DNA or RNA that codes for protein. The coding sequence is composed of exons and is translated into a sequence of amino acids.

Terminator[edit]

The terminator is a section of nucleic acid sequence that marks the end of a gene or operon in genomic DNA during transcription.

Cistron vs. Gene[edit]

While the term "cistron" is often used interchangeably with "gene," it specifically refers to the functional unit of heredity that encodes a single polypeptide. In contrast, a gene may include multiple cistrons, especially in eukaryotic organisms where genes can be split into multiple exons and introns.

Historical Context[edit]

The concept of the cistron was introduced by Seymour Benzer in the 1950s as a way to describe the functional units of genetic material. Benzer's work on the rII locus of bacteriophage T4 helped to elucidate the fine structure of genes.

References[edit]

External Links[edit]

Cistron on WikiMD

@@ Line 1: / Line 1: @@
-== Cistron ==
+{{Short description|A segment of DNA that encodes a single polypeptide chain or protein.}}
+{{Infobox gene
+| name = Cistron
+| image = <!-- Image removed -->
+| caption = <!-- Caption removed -->
+| symbol =
+| alt_symbols =
+| HGNCid =
+| OMIM =
+| EntrezGene =
+| MGIid =
+| location =
+}}
-A cistron is a segment of DNA that encodes for a specific polypeptide or protein. It is the basic unit of genetic function and represents the coding region of a gene. The term "cistron" was first introduced by Seymour Benzer in 1957 to describe the genetic unit that corresponds to a single polypeptide chain.
+A '''cistron''' is a segment of [[DNA]] that encodes a single [[polypeptide]] chain or [[protein]]. The term "cistron" is synonymous with "[[gene]]" in the context of [[molecular biology]].
-=== Structure ===
+== Structure and Function ==
+A cistron is defined by its ability to produce a functional product, typically a protein, through the processes of [[transcription]] and [[translation (biology)|translation]]. Each cistron contains a sequence of [[nucleotides]] that includes a [[promoter]], a coding sequence, and a [[terminator]].
-The structure of a cistron consists of a sequence of nucleotides that encode the amino acid sequence of a protein. This sequence is transcribed into messenger RNA (mRNA) during the process of transcription. The mRNA is then translated into a protein during the process of translation.
+=== Promoter ===
+The [[promoter (genetics)|promoter]] is a region of DNA that initiates transcription of a particular gene. Promoters are located near the transcription start sites of genes and can be about 100–1000 base pairs long.
-=== Function ===
+=== Coding Sequence ===
+The coding sequence of a cistron is the portion of a gene's DNA or RNA that codes for protein. The coding sequence is composed of [[exons]] and is translated into a sequence of [[amino acids]].
-Cistrons play a crucial role in determining the phenotype of an organism. Mutations in cistrons can lead to changes in the amino acid sequence of a protein, which can affect its structure and function. These changes can result in genetic disorders or diseases.
+=== Terminator ===
+The [[terminator (genetics)|terminator]] is a section of nucleic acid sequence that marks the end of a gene or operon in genomic DNA during transcription.
-=== Regulation ===
+== Cistron vs. Gene ==
+While the term "cistron" is often used interchangeably with "gene," it specifically refers to the functional unit of heredity that encodes a single polypeptide. In contrast, a gene may include multiple cistrons, especially in [[eukaryotic]] organisms where genes can be split into multiple exons and introns.
-The expression of cistrons is tightly regulated by various mechanisms within the cell. Regulatory elements such as promoters, enhancers, and repressors control the transcription of cistrons. Additionally, post-transcriptional modifications can also influence the expression of cistrons.
+== Historical Context ==
+The concept of the cistron was introduced by [[Seymour Benzer]] in the 1950s as a way to describe the functional units of genetic material. Benzer's work on the [[rII locus]] of [[bacteriophage T4]] helped to elucidate the fine structure of genes.
-=== Importance ===
+== See Also ==
+* [[Gene]]
+* [[Operon]]
+* [[Transcription (genetics)]]
+* [[Translation (biology)]]
+* [[Protein synthesis]]
-Understanding cistrons is essential in the field of molecular biology and genetics. By studying cistrons, researchers can gain insights into the genetic basis of diseases, develop new therapies, and improve our understanding of evolutionary processes.
+== References ==
+{{Reflist}}
-For more information on related topics, please refer to the following articles:
+== External Links ==
-* [[Gene expression]]
+* [https://www.wikimd.com/wiki/Cistron Cistron on WikiMD]
-* [[Genetic code]]
-* [[Transcription]]
-* [[Translation]]
-[[File:DNA_structure.jpg|thumb|DNA Structure]]
 [[Category:Genetics]]
-[[Category:Molecular Biology]]
+[[Category:Molecular biology]]
-{{medicine-stub}}
+[[Category:Gene expression]]