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#SNP

2 public questions tagged with this topic.

Molecular Marker

Which DNA-based marker is best for high-throughput genotyping?

High-throughput genotyping demands markers that are extremely abundant, evenly distributed across chromosomes, biallelic, easily automated and suitable for multiplexed detection in parallel reactions. Single Nucleotide Polymorphisms fulfill these requirements with occurrence every few hundred bases, amenable to array-based chips, next-generation sequencing and fluorescence-based assays producing millions of genotypes rapidly with minimal DNA input. SSR, VNTR and RAPD rely on gel electrophoresis and manual allele sizing, limiting throughput and automation. SNP platforms offer cost-effective scalable screening for association studies and genomic selection programs.

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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Molecular Marker

What is the main difference between SSR and SNP?

Simple sequence repeats and single nucleotide polymorphisms differ fundamentally in molecular basis and allelic diversity. SSR loci contain tandem repeats of short motifs where polymorphism arises from variation in repeat copy number, generating multiple alleles and high polymorphic information content. SNP represents a single base substitution, transition or transversion, at a specific genomic position, typically biallelic with lower information per locus but abundant genome-wide. SNP assays generally do not need radioactive labeling and differ in length scale from SSR amplicons.

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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