Absence of mitochondrial progesterone receptor polymorphisms in women with spontaneous preterm birth.
OBJECTIVE: The truncated mitochondrial progesterone receptor (PR-M) is homologous to nuclear PRs with the exception of an amino terminus hydrophobic membrane localization sequence, which localizes PR-M to mitochondria. Given the matrilineal inheritance of both spontaneous preterm birth (SPTB) and the mitochondrial genome, we hypothesized that (a) PR-M is polymorphic and (b) PR-M localization sequence polymorphisms could result in variable progesterone-mitochondrial effects and variable responsiveness to progesterone prophylaxis. METHODS: Secondary analysis of DNA from women enrolled in a multicenter, prospective, study of 17 alpha-hydroxyprogesterone caproate (17OHPC) versus placebo for the prevention of recurrent SPTB. DNA was extracted from stored saliva. RESULTS: The PR-M localization sequence was sequenced on 344 patients. Sequences were compared with the previously published 48 base-pair sequence, and all were identical. CONCLUSIONS: We did not detect genetic variation in the mitochondrial localization sequence of the truncated PR-M in a group of women at high risk for SPTB.
Manuck, TA; Price, TM; Thom, E; Meis, PJ; Dombrowski, MP; Sibai, B; Spong, CY; Rouse, DJ; Iams, JD; Simhan, HN; O'Sullivan, MJ; Miodovnik, M; Leveno, KJ; Conway, D; Wapner, RJ; Carpenter, M; Mercer, B; Ramin, SM; Thorp, JM; Peaceman, AM; Eunice Kennedy Shriver National Institute of Child Health and Human Development Maternal-Fetal Medicine Units Network,
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