HOME >> BIOLOGY >> NEWS
Differences between boys and girls show less than three weeks into pregnancy

Female embryos exert a greater influence than male embryos over the hormone that nurtures early pregnancy, and the difference can be detected as little as 16 days after conception, according to new research published (Wednesday 30 January) in Europes leading reproductive medicine journal Human Reproduction.*

Israeli scientists have demonstrated that levels of maternal serum HCG (MSHCG) the hormone that reveals in blood or urine tests whether or not a woman is pregnant are nearly a fifth higher less than three weeks into pregnancy if a woman is carrying a girl than if she is carrying a boy.

HCGs role at the beginning of pregnancy is to maintain the function of the corpus luteum a temporary structure formed in the ovary after an egg is shed that produces oestrogen and progesterone until the placenta can take over their production.

"Other research has already shown that MSHCG is significantly higher in the presence of a female fetus in the second and third trimesters of pregnancy. But weve discovered that levels were increased as early as 16 days after fertilisation," said lead researcher, Dr Yuval Yaron, Director of the Prenatal Genetic Diagnosis Unit in the Genetic Institute at Tel Aviv Medical Center.

He said that their finding that MSHCG levels increase with female fetuses before the development of the glands that produce the fetal hormones means that the higher level must be due to the way that the placenta expresses proteins in female pregnancies and not to male hormones suppressing MSHCG, as has been suggested by other researchers. Genes that the researchers believe are potential candidates for regulating protein expression in the placenta have been mapped to the X (female) chromosome.

The study involved 347 IVF pregnancies with women being measured for MSHCG levels between one and three times from day 14 to day 20. There were 184 female fetuses and 163 male fetuses. MSCHG levels were 18.5% higher by three weeks gestat
'"/>

Contact: Margaret Willson
m.willson@mwcommunications.org.uk
44-01-536-772-181
European Society for Human Reproduction and Embryology
29-Jan-2002


Page: 1 2

Related biology news :

1. Sex Differences in Cardiovascular Disease
2. Differences in response to amphetamines found between males and females pre-puberty
3. Autoimmune Diseases Study Shows Differences Between Men And Women
4. Evaluation Of The Two Types Of Cardiac Pacemakers Indicates Only Modest Differences In Value
5. Sex Differences In Heart Disease May Be Due To Enzyme That Breaks Down Fat
6. Malnutrition Impacts Longevity Of Females More Than Males And Shows Gender Differences In Fruit Flies
7. Landmark agreement between Samoa and UC Berkeley could help search for AIDS cure
8. New research suggests link between maternal diet and childhood leukemia risk
9. Fossils reveal direct link between global warming and genetic diversity in wildlife
10. Battle between bubbles might have started evolution
11. UCSD researchers are first to demonstrate molecular link between inflammation and cancer

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/25/2019)... ... April 24, 2019 , ... NDA Partners Chairman ... than 20 years of experience in the development of drug and genomic diagnostic products ... , Prior to joining NDA Partners, Dr. Maddala served as Vice President of Biometrics ...
(Date:4/18/2019)... ... April 18, 2019 , ... As the industry ... popular trial design that have the potential to increase patient recruitment and retention. ... sponsors due to the complexity of regulations, potential cost implications and a multitude ...
(Date:4/16/2019)... ... April 16, 2019 , ... HealthLink International, experts ... its new medical device facility on Friday, April 12. Headquartered in the Netherlands, ... new facility includes 108,500 square feet and houses 32 employees enabling HealthLink to ...
Breaking Biology News(10 mins):
(Date:5/2/2019)... ... April 30, 2019 , ... ... standard, REPROCELL USA Inc. has demonstrated its ability to provide various services ... aims to enhance customer satisfaction through the effective implementation of its quality ...
(Date:5/2/2019)... ... 02, 2019 , ... Stay on top of current hot topics through free ... to all webinars is free, so be sure to register today to save your ... http://www.xtalks.com to see our upcoming webinars: , CLINICAL TRIALS , May 7 – ...
(Date:5/2/2019)... BOSTON (PRWEB) , ... May 02, 2019 , ... ... hair transplantation clinic in the greater Boston area. Gone are the days of ... The ARTAS® iX Robotic Hair Restoration System is the only robotic intelligent solution ...
(Date:4/25/2019)... ... 24, 2019 , ... Inference Solutions , a global ... announced global availability of Inference Studio’s latest version, which makes it easier for ... the power of Google’s Contact Center AI (CCAI). , As consumers ...
Breaking Biology Technology:
Cached News: