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PubMed · 12506486

[DNA chip and SNP].

Tomomi Kimura·Masaaki Muramatsu
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Abstract

Single nucleotide polymorphism (SNP) is high-density genetic marker that could be utilized to dissect genetic traits that influence susceptibility to common diseases and responsiveness to drugs. Requirement for massive SNP analysis has enhanced development of various SNP genotyping technologies. DNA chip is one of such methods, which detects SNPs in parallel on an array of surface bound oligonucleotides. Recent application of DNA chip for high-throughput SNP analysis as well as clinical diagnosis will be presented.

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Genetic MarkersGenetic TechniquesGenotypeHumansPolymorphism, Single NucleotideSequence Analysis, DNAEnglish AbstractJournal Article

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Tomomi Kimura, Masaaki Muramatsu. 2002. [DNA chip and SNP].. https://pubmed.ncbi.nlm.nih.gov/12506486/

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High levels of linkage disequilibrium and associations with forage quality at a phenylalanine ammonia-lyase locus in European maize (Zea mays L.) inbreds.

Forage quality of maize is influenced by both the content and structure of lignin in the cell wall. Phenylalanine Ammonia-Lyase (PAL) catalyzes the first step in lignin biosynthesis in plants; the deamination of L-phenylalanine to cinnamic acid. Successive enzymatic steps lead to the formation of three monolignols, constituting the complex structure of lignin. We have cloned and sequenced a PAL genomic sequence from 32 maize inbred lines currently employed in forage maize breeding programs in Europe. Low nucleotide diversity and excessive linkage disequilibrium (LD) was identified at this PAL locus, possibly reflecting selective constrains resulting from PAL being the first enzyme in the monolignol, and other, pathways. While the association analysis was affected by extended LD and population structure, several individual polymorphisms were associated with neutral detergent fiber (not considering population structure) and a single polymorphism was associated with in vitro digestibility of organic matter (considering population structure).

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