Completed

NCT Number: NCT00341120

Genetic Causes of Male Infertility

This study is being conducted at the University Hospital of Lund University in Malmo, Sweden, in collaboration with the U.S. National Institute of Child Health and Human Development. The study will try to identify genetic causes of impaired sperm production and male infertility. It will focus on the possible role of the MTHFR and CBS genes, which regulate absorption and metabolism of the vitamin, folate in infertility. If the nutritional intake or metabolism of this vitamin is related to male infertility, then this cause of infertility would be potentially curable.

Fertile and infertile men between 20 and 45 years of age may be eligible for this study. Criteria include the following:

* Fertile men: men whose partners are younger than age 40 and are attending Lund University prenatal clinic; who have fathered one or more pregnancies and who stopped birth control to achieve the present pregnancy; who achieved the present pregnancy in less than 12 months of unprotected intercourse. * Infertile men: men referred to the Scandian Andrology Centre whose infertility is unexplained, whose partners are younger than age 40 and who have had regular sexual intercourse without contraception for at least 12 months without achieving a pregnancy.

All participants will have the following tests and procedures:

* Complete a questionnaire providing information about their reproductive and medical history and recent dietary history; * Provide blood samples for analysis of red cell folate, plasma folate, plasma homocysteine, plasma B12, and for genetic evaluation; * Provide a semen sample for routine analysis, including volume, sperm concentration, sperm motility, and sperm morphology.

In addition, infertile men will undergo a physical examination and review of their medical records.

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Key information

Conditions

Male Infertility Genital Diseases Genital Diseases, Male Infertility Infertility, Male Male Urogenital Diseases Urogenital Diseases

Age range

20 year–45 year

Sex eligibility

Male

Study type

Observational

Primary location

Malmo University Hospital

Malmö, Sweden

About this study

It is evident that genetic variation plays a substantial role in the etiology of male infertility. Studies of children fathered through intracytoplasmic sperm injection or ICSI have revealed mutations on the AZF region of the Y chromosome linked to male infertility. Mutations of other genes may also be involved. Candidates would include genes for the androgen receptor, follicle-stimulating hormone, and luteinizing hormone, and genes involved in the regulation of spermatogenesis and sperm motility. Mutations in mitochondrial DNA have been linked to poor sperm motility and raise the possibility that some types of male subfertility may be inherited only through the female line.

We propose to assess the role of folate/homocysteine status and MTHFR and CBS gene variants in infertile men in Sweden with no known cause for their infertility and whose wives/partners appear to be fertile. We propose to perform the study in Sweden since Sweden, unlike the U.S., at present does not mandate the enrichment of flour or other foodstuffs with folate.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

INCLUSION CRITERIA INFERTILE MEN:

Referred to the Scanian Andrology Centre.

Age 20-45.

Partner age less than 40.

Having had regular sexual intercourse without contraception for a year or more without achieving a pregnancy.

Exclusion criteria

INFERTILE MEN:

Klinefelters syndrome.

Hypogondotropic hypogonadism.

Y-chromosome microdeletion or abnormality.

Other genetic cause for infertility.

Obstructive azoospermia.

Partner with salpingitis.

Partner with polycystic ovarian syndrome.

Partner with disturbance of ovulation.

Partner with endometriosis.

History of cancer.

History of treatment with cytotoxic drugs, irradiation, or sulfasalazopyrine.

History of cryptorchidism.

History of mumps orchitis.

History of vasectomy.

Inclusion criteria

FERTILE MEN:

Partner attending Lund University prenatal clinic.

Age 20-45.

Partner age less than 40.

Having fathered one or more pregnancies.

Having stopped birth control to achieve present pregnancy.

Having achieved present pregnancy in less than 12 months of unprotected intercourse.

Exclusion criteria

FERTILE MEN:

History of cancer.

History of treatment with cytotoxic drugs, irradiation, or sulfasalazopyrine.

History of cryptorchidism.

History of mumps orchitis.

Having sought or partner having sought treatment or investigation for fertility.

Sponsors and collaborators

Lead sponsor

Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)

Nih

Registry information

Official study title

Methylenetetrahydrofolate Reductase C677T Mutation, Other Variant Genotypes, and Male Infertility

Important dates

Study start: 2003
Study completion: 2012
First posted: Jun 21, 2006
Registry last updated: Apr 5, 2018

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Published trials that share one or more normalized conditions with this study.

Completed