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Bam HI Restriction Fragment Length Polymorphisms for Hypoxanthine‐Guanine Phosphoribosyltransferase (HPRT) Gene of Carriers and Controls of HPRT Deficiency in Japan
Author(s) -
Igarashi Takashi,
Ikegami Hirohiko,
Yamazaki Hiroko,
Minami Mutsuhiko
Publication year - 1990
Publication title -
pediatrics international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.49
H-Index - 63
eISSN - 1442-200X
pISSN - 1328-8067
DOI - 10.1111/j.1442-200x.1990.tb00777.x
Subject(s) - hypoxanthine guanine phosphoribosyltransferase , microbiology and biotechnology , restriction fragment length polymorphism , allele , genetics , loss of heterozygosity , locus (genetics) , restriction enzyme , biology , phosphoribosyltransferase , gene , genotype , mutant
Three‐allele restriction fragment length polymorphisms (RFLPs) for the restriction endonuclease Bam HI are known at the hypoxanthine‐guanine phosphoribosyltransferase (HPRT, E.C.2.4.2.8.) gene locus. The alleles are expressed phenotypically on Southern blots as three distinct pairs of fragments that hybridize to HPRT cDNA: i)a 22‐kilobase (kb) / 25‐kb pair, ii) a 12‐kb / 25‐kb pair, and iii) a 22‐kb / 18‐kb pair. Allele frequencies in 119 unrelated Japanese people were 0.38 for the 22‐kb / 25‐kb allele, 0.43 for the 12‐kb / 25‐kb allele, and 0.19 for the 22‐kb / 18‐kb allele, an average heterozygosity of 66% in Japanese females, a higher rate than in Caucasian females. Five out of nine carriers of partial or complete HPRT deficiency showed heterozygous patterns for Bam HI RFLPs.