Gene point mutation service

NegotiableUpdate on 03/04

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Nature of the Manufacturer: Producers

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Place of Origin

Online Consult

Overview

Gene point mutation service refers to the alteration of a single base in a DNA sequence, including base substitutions, insertions, or deletions. This mutation may affect the structure and function of proteins, leading to changes in biological traits or the occurrence of diseases. Point mutations can occur naturally or be induced by environmental factors such as radiation or chemicals. Although most point mutations are neutral, some mutations may be pathogenic and even associated with genetic diseases such as cancer.

Product Details

1Gene point mutation serviceDefinition and Basic Concepts

Point Mutation refers to a mutation in a DNA or RNA sequenceSingle NucleotideThe substitution, insertion, or deletion of is the smallest form of variation in the genome. Its core features include:

molecular basisIt acts at the base pair level and does not involve structural changes in large fragments of DNA.
Mutation form：

Base substitutionBase Substitution: One base is replaced by another base.
Code shift mutation(Frameshift Mutation): Single base insertion or deletion causing a reading frame shift.

mechanism of occurrenceSpontaneous (DNA replication error) or induced (radiation, chemical mutagens).

IIGene point mutation serviceMolecular classification system

According to the nature and effects of base changes, point mutations can be classified into the following types:

（1） Base Substitution

type	definition	frequency of occurrence	Biological significance
transformation（Transition）	Purine → Purine (A ↔ G) Or pyrimidine → pyrimidine (T ↔ C) Replace	Dominated in nature (>70%)	Due to the similarity in chemical structure, it is more likely to occur
Shake and Swap（Transversion）	Purine → Pyrimidine (A ↔ T, A ↔ C, G ↔ T, G ↔ C) Replace	relatively low	May lead to more significant changes in amino acids

（2） Classification of functional effects

type	molecular mechanism	Protein influence	example, instance, case, illustration
Synonymous mutation（Synonymous）	The codon changes but the encoded amino acid remains unchanged (e.g. CUU → CUC both encode leucine)	No functional changes ('silent mutation')	Most neutral evolution
missense mutation（Missense）	Codon change leads to amino acid substitution	May damage protein structure/function	Sickle cell anemia (β - globin GAG → GTG, glutamic acid → valeric acid)
nonsense mutation（Nonsense）	Encoding amino acid codons → termination codons (such as TAC → TAA, tyrosine → termination)	Generate truncated proteins, often inactive	Cystic fibrosis (CFTR gene nonsense mutation)
Terminate password mutation（Stop-loss）	Termination codon → Amino acid codon	Abnormal protein elongation	Related to some cancers

（3） Frameshift Mutation

mechanismInsert/delete 1-2 bases → all subsequent codons are misplaced.
effect：

Generate a completely incorrect amino acid sequence for Wan.
High probability of premature termination codon → functional protein loss.

example, instance, case, illustrationTay Sachs disease (HEXA gene 4-bp insertion).

3、 Biological effects: from molecules to ecosystems

The effect of point mutations has multidimensional complexity:

（1） Individual level impact

effect type	mechanism	example, instance, case, illustration
Neutral effect	Mutation located in non coding region/synonymous mutation	Abundant accumulation in the human genome constitutes genetic diversity
Beneficial effects	Enhance environmental adaptability	-CCR5 Δ 32 mutation → HIV resistance -Bacterial antibiotic resistance mutation
Harmful effects	Destruction of critical functional domains	-Huntington's disease (HTT gene CAG repeat extension) -Mitochondrial complex I mutation → neurodegeneration

（2） Group and Evolutionary Significance

Genetic Diversity EnginePoint mutations are the raw material of natural selection, driving adaptive evolution (such as the heterozygous advantage of sickle cell anemia in high-risk areas of malaria).
Sudden load(Mutation Load): The accumulation of harmful mutations reduces population adaptability and requires balanced selection for clearance.
Dynamic mutation(Dynamic Mutation): Triple nucleotide repeat amplification → exacerbation of intergenerational symptoms (such as fragile X syndrome).

4、 Testing technology system

（1） Classic methods

technology	principle	Applicable scenarios	局限性
PCR-RFLP	Mutation changes restriction enzyme site → difference in electrophoretic fragment length	Known loci (such as SNP typing)	Dependent on specific enzyme cleavage sites
ARMS	Primer 3 'end matching mutation site → selective amplification	Clinically known mutations (such as EGFR T790M)	Multiple primers need to be designed
SSCP(Single strand conformation polymorphism)	Mutation changes single stranded DNA folding → electrophoretic mobility difference	Unknown point mutation screening	Small fragments (<200bp) with high false positive rate

（2） Modern high-throughput technology

technology	advantage	application
HRM(High resolution melting curve)	Unlabeled, real-time detection of melting temperature differences	Somatic mutation screening (sensitivity 0.1%)
NGS(Second generation sequencing)	Whole genome/exome coverage, multiple genes in parallel	Identification of cancer driving mutations (such as DNMT3A R882)
digital PCR	Absolute quantification, suitable for low-frequency mutations	Liquid biopsy, minimal residual disease monitoring