Jeffrey Klein
Columbia University
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Featured researches published by Jeffrey Klein.
Obstetrics & Gynecology | 2003
Jeffrey Klein; Joseph E. Peña; Melvin H. Thornton; Mark V. Sauer
OBJECTIVE To survey the attitudes of human immunodeficiency virus (HIV)–serodiscordant couples interested in assisted reproduction and better characterize their motivations for reproducing. METHODS A prospectively designed questionnaire and open-ended interview of 50 consecutive HIV-serodiscordant couples interested in undergoing assisted reproduction to avoid transmission of virus were studied. Demographic characteristics and attitudes regarding beginning a family were obtained. By design, males were HIV seropositive (age, 38.0 ± 5.4 years, range 26–51 years) and healthy. Women were HIV seronegative (age, 34.5 ± 5.1 years, range 24–45 years). Most couples were married (44 of 50) and in long-term relationships (duration of relationship, 8.9 ± 4.9 years, range 1–20 years). RESULTS Before presentation, nine of 50 couples had conceived and delivered a child (three of nine instances with knowledge of paternal HIV status). Previous timed intercourse occurred in 8% of couples (four of 50). Six individuals stated they would proceed with timed intercourse if no other alternatives existed. Forty-eight percent said they would prefer artificial insemination with donor sperm in lieu, if assisted reproduction failed or were unavailable. Forty-three percent of respondents would pursue “posthumous conception” if cryopreserved sperm or embryos were available in the event of the partners death. Most couples discussed the possibility of single parenting (45 of 50; 90%) or the possibility for adoptive parenting (29 of 50; 58%). Couples were aware of risk, and 92% (46 of 50) understood that their child might contract HIV. CONCLUSION Human immunodeficiency virus–serodiscordant couples are actively seeking reproductive assistance and often consider or practice unsafe measures to achieve pregnancy. Reproductive issues and concerns unique to these couples need to be addressed before treatment.
Haemophilia | 2003
Joseph E. Peña; Jeffrey Klein; Melvin H. Thornton; Mark V. Sauer
Summary. Outlined is our experience with couples in whom the male was both human immunodeficiency virus (HIV) seropositive and a haemophiliac who underwent assisted reproductive technologies (ART) in order to attain family goals while minimizing the risk of HIV transmission. We report their demographics, attitudes towards assisted reproduction, and ART performance and outcomes. The study included HIV serodiscordant couples (n = 11) who underwent ART at a university‐based infertility practice from August 1997 to May 2002. Prior to treatment, couples prospectively completed a survey regarding their demographics and attitudes towards assisted reproduction. All couples underwent ART and pregnancy outcomes were analysed. The majority of the patients were fully employed, college‐educated, in good health, married and motivated to have a child while minimizing the risk of HIV transmission. Eleven couples underwent 25 cycles of ART [19 in vitro fertilization (IVF) cycles; five frozen embryo transfer cycles; and one oocyte donation cycle] resulting in nine successful pregnancies. The ongoing/delivered pregnancy rate per initiated IVF cycle was 42.1% per embryo transfer. Eight of 11 (72.7%) couples achieved a successful pregnancy. More than half (six of 11; 54.5%) the couples conceived during their initial attempt. Four of nine (44.4%) pregnancies were multiple gestations, including three sets of triplets. All female recipients tested seronegative for HIV at 3 and 6 months post‐embryo transfer. All delivered babies (n = 8) tested seronegative for HIV at birth and 3 months postpartum. Four pregnancies are currently ongoing. ART should be considered for HIV serodiscordant couples with haemophilia who desire to have children in order to minimize the risk of viral infection.
Endocrine | 2001
Leslie Lobel; Susan Pollak; Jeffrey Klein; Joyce W. Lustbader
We have expressed the extracellular domain of the human luteinizing hormone/chorionic gonadotropin (hLH/CG) receptor as a fusion protein with thioredoxin in the cytoplasm of an Escherichia coli strain that contains mutations in both the thioredoxin reductase and glutathione reductase genes. The chimeric protein isolated following induction of expression is purified in a soluble form and binds hCG with an affinity approximating that of native receptor. This truncated form of the receptor displays the same specificity as intact hLH/CG receptor and does not bind human follicle stimulating hormone. This cytoplasmically produced protein is expressed at levels that exceed 10 mg/L. Expression of properly folded extracellular domain of the hLH/CG receptor in the cytoplasm of E. coli allows the facile and economic purification of large quantities of material. This will facilitate the determination of the structure of the hormone-binding domain of the glycoprotein receptor as well as the production of epitope-specific antibodies.
American Journal of Obstetrics and Gynecology | 2001
Jeffrey Klein; Mark V. Sauer
Fertility and Sterility | 2006
Jeffrey Klein; M. Howard; L. Grunfeld; T. Mukherjee; B. Sandler; A.B. Copperman
Fertility and Sterility | 2005
Jane Ruman; Susan Pollak; Rhonda K. Trousdale; Jeffrey Klein; Joyce W. Lustbader
Protein Expression and Purification | 2002
Leslie Lobel; Susan Pollak; Brandie Lustbader; Jeffrey Klein; Joyce W. Lustbader
Endocrinology | 2007
Rhonda K. Trousdale; Susan Pollak; Jeffrey Klein; Leslie Lobel; Yasuhiro Funahashi; Nikki Feirt; Joyce W. Lustbader
Fertility and Sterility | 2004
Lawrence Grunfeld; Jeffrey Klein; Carmit Steren
Fertility and Sterility | 2011
B.A. Levine; Jeffrey Klein; A. Charles; Mark V. Sauer