TY - JOUR
T1 - Methods for studying recombination on chromosomes that undergo nondisjunction
AU - Chakravarti, Aravinda
AU - Slaugenhaupt, Susan A.
N1 - Funding Information:
This study was supported by NIH Grants GM33771 and HD00774 to A.C. We also thank Drs. Terry Hassold and Jiirg Ott for comments on this manuscript.
PY - 1987/9
Y1 - 1987/9
N2 - A lod score method is provided for mapping genes relative to the centromere using family data from autosomal trisomies. Such gene-centromere mapping can be performed whenever two or more members of a meiotic tetrad can be recovered. The critical mapping parameter is not the recombination value θ or the map distance w, but the probability of nonreduction y. In a disomic gamete arising by nondisjunction in a heterozygous host, the probability of heterozygosity (nonreduction) is 1 - y 2 for a meiosis I error and y for a meiosis II error. Under various assumptions regarding chiasma interference, y can be related to θ and w. We provide specific methods for estimating y and θ from trisomy data using maximum likelihood, so that recombination may be studied on chromosomes that underwent nondisjunction.
AB - A lod score method is provided for mapping genes relative to the centromere using family data from autosomal trisomies. Such gene-centromere mapping can be performed whenever two or more members of a meiotic tetrad can be recovered. The critical mapping parameter is not the recombination value θ or the map distance w, but the probability of nonreduction y. In a disomic gamete arising by nondisjunction in a heterozygous host, the probability of heterozygosity (nonreduction) is 1 - y 2 for a meiosis I error and y for a meiosis II error. Under various assumptions regarding chiasma interference, y can be related to θ and w. We provide specific methods for estimating y and θ from trisomy data using maximum likelihood, so that recombination may be studied on chromosomes that underwent nondisjunction.
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U2 - 10.1016/0888-7543(87)90102-9
DO - 10.1016/0888-7543(87)90102-9
M3 - Article
C2 - 3478296
AN - SCOPUS:0023410736
SN - 0888-7543
VL - 1
SP - 35
EP - 42
JO - Genomics
JF - Genomics
IS - 1
ER -