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Pregnancy Timeline by SemestersFemale Reproductive SystemFertilizationThe Appearance of SomitesFirst TrimesterSecond TrimesterThird TrimesterFetal liver is producing blood cellsHead may position into pelvisBrain convolutions beginFull TermWhite fat begins to be madeWhite fat begins to be madeHead may position into pelvisImmune system beginningImmune system beginningPeriod of rapid brain growthBrain convolutions beginLungs begin to produce surfactantSensory brain waves begin to activateSensory brain waves begin to activateInner Ear Bones HardenBone marrow starts making blood cellsBone marrow starts making blood cellsBrown fat surrounds lymphatic systemFetal sexual organs visibleFinger and toe prints appearFinger and toe prints appearHeartbeat can be detectedHeartbeat can be detectedBasic Brain Structure in PlaceThe Appearance of SomitesFirst Detectable Brain WavesA Four Chambered HeartBeginning Cerebral HemispheresEnd of Embryonic PeriodEnd of Embryonic PeriodFirst Thin Layer of Skin AppearsThird TrimesterDevelopmental Timeline
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Home--History--Bibliography- -Pregnancy Timeline- Prescription Drugs/Pregnancy- Pregnancy Calculator - Reproductive System- -News Alerts

February 17, 2012--------News Archive Return to: News Alerts

Light microscopy image of human sperm, showing a sample with an exceptional sperm count.
Credit: Dr Joyce Harper, UCL, Wellcome Images.

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Secret of Sperm Quality Control Revealed

Yale researchers have discovered how the p53 gene oversees quality control in the production of sperm

By Bill Hathaway

The research published online Feb. 16 in the journal Current Biology opens up the potential of developing new forms of birth control and fertility treatment — and even new ways to combat many forms of cancer.

Sperm and other cells go through a sort of inspection process triggered by a key regulatory gene, p53, which orders the destruction of cells with damaged DNA. This ability has earned it the title of “guardian of the genome,” and damage to p53 has been implicated in many forms of cancer.

By studying sperm production in mice, “we have identified p53’s new boss, which controls p53 in a way that had been hypothesized before but had not been shown in any animal,” said Haifan Lin, professor of cell biology and of genetics, director of the Yale Stem Cell Center, and senior author of the paper.

The Yale team found among more than 1,500 micro-RNA molecules involved in many cellular processes, a regulator called Pumilo1 that controls eight processes that interact with p53 in sperm production.

When Pumilo 1 is deleted in mice, sperm production and fertility are reduced because p53 becomes over active and orders the destruction of too many sperm. The mechanism may play a key role in male fertility, but it could also be implicated in many biological processes because protection of DNA is so fundamental to life, Lin noted.

“This is a crucial gate-keeping mechanism which allows bad cells, but not good cells, to be killed,” Lin said. “This same process may be at play in other tissues, such as cancer.”

Dong Chen was lead author of the study. Wei Zheng, Aiping Lin, Katherine Uyhazi, and Hongyu Zhao are other contributing authors from Yale.

The research was funded by the National Institutes of Health (NIH) and supported by the Yale Clinical and Translational Science Award grant from the National Center for Advancing Translational Sciences at the NIH.

Original article: http://news.yale.edu/2012/02/16/secret-sperm-quality-control-revealed-yale-scientists