Abstract
The enzymatic activity of phosphoribosylglycinamide synthetase (GARS) has been studied in several cases of partial monosomies and full and partial trisomies 21. An excess of GARS activity was found in regular trisomy 21 with a trisomy 21/normal ratio equal to 1.55. A 0.99 ratio was found in 21q21----21pter monosomy; a 0.54 ratio was found in 21qter----21q22 monosomy; a 0.88 ratio, in 21q21----21pter trisomy, and a 1.46 ratio, in 21q22.1 trisomy. Consequently, the GARS gene locus, assigned to chromosome 21, could be localized in subband 21q22.1.
MeSH Terms
Adolescent
Carbon-Nitrogen Ligases
Chromosome Banding
Chromosome Deletion
Chromosome Mapping
Chromosomes, Human, 21-22 and Y
Down Syndrome/enzymology,genetics
Female
Fibroblasts/enzymology
Humans
Infant
Ligases/genetics
Male
Multienzyme Complexes
Phosphoribosylglycinamide Formyltransferase
Translocation, Genetic
Chemicals
Multienzyme Complexes
Phosphoribosylglycinamide Formyltransferase
Ligases
Carbon-Nitrogen Ligases
GART protein, human
phosphoribosylamine-glycine ligase
Authors & Affiliations
8 authors, click to expand affiliations / ORCID
Chadefaux B
Allard D
Rethoré M O
Raoul O
Poissonnier M
Gilgenkrantz S
Cheruy C
Jérôme H
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