Related Experiment Video
Updated: Jul 14, 2026
08:07
A Micropatterning Assay for Measuring Cell Chirality
Published on: March 11, 2022
Simultaneous origin of homochirality, the genetic code and its directionality
1Department of Physiology, 2174 Biomedical and Physical Sciences Building, Michigan State University, East Lansing, Michigan, USA. rootbern@msu.edu
Summary
The origin of molecular homochirality and the genetic code may have co-evolved. This hypothesis suggests amino acids and ribonucleotides developed chirality simultaneously with the genetic code
Area of Science:
- Origin of life studies
- Chirality in biochemistry
- Molecular evolution
Background:
- The emergence of homochirality (molecules of a single chirality) in biological systems is a long-standing puzzle.
- Existing theories often propose a sequential emergence of chirality, starting with one molecular class.
Purpose of the Study:
- To propose a novel, testable hypothesis for the simultaneous emergence of chirality in amino acids and ribonucleotides.
- To link the origin of homochirality with the development of the genetic code's directionality.
Main Methods:
- Hypothetical model proposing simultaneous co-evolution.
- Focus on interaction systems involving amino acids, peptides, nucleotide bases, sugars, and polynucleotides.
Main Results:
- Presents a new framework for understanding the coupled origin of homochirality and the genetic code.
- Suggests a mechanism where chirality in key biomolecules and genetic system directionality arose together.
Conclusions:
- The proposed hypothesis offers an experimentally verifiable explanation for the simultaneous emergence of homochirality and genetic code directionality.
- This integrated model challenges previous sequential theories and provides a new perspective on early life's molecular organization.
Related Concept Videos
02:30Chirality in Nature
Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid. The...
02:05Prochirality
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
03:06From DNA to Protein
The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
01:25The Central Dogma
Overview
01:20The Central Dogma
The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...
RNA is the Missing Link Between DNA and Proteins
In the early 1900s, scientists discovered that DNA stores all the information needed for cellular functions and that proteins perform most of these functions. However, the mechanisms of converting genetic information into functional proteins remained unknown for many years. Initially, it was believed that a single gene is...
02:25Chirality
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...