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:12/5/2018)... , ... December 03, 2018 , ... ... Aesthetics , an emerging leader in the distribution and marketing of cutting-edge aesthetic ... growth, projecting $20MM in sales for 2018. Cartessa’s success can be attributed ...
(Date:12/5/2018)... DIEGO (PRWEB) , ... December 04, 2018 , ... ... leverage Fastec’s extensive expertise and existing IP in the development of innovative solutions ... has been integrated into diverse systems from microfluidics to industrial machinery and instrumentation, ...
(Date:11/27/2018)... ... 2018 , ... PulseEd™ uses researched technology, published in the Journal of ... flow to the penis. Regular and unimpeded blood flow to the blood vessels of ... function. The recorded results of SWT (sound wave therapy), indicated that almost 80% of ...
Breaking Biology News(10 mins):
(Date:11/13/2018)... ... November 13, 2018 , ... Renowned Honolulu veterinarian, Dr. Patrick Leadbeater, has ... Kauai. Dr. Leadbeater, of Kahala Pet Hospital on Oahu, is a ... began traveling to the island of Kauai on an almost weekly basis to perform ...
(Date:11/13/2018)... , ... November 13, 2018 , ... , Park Systems, ... in China. With the increasingly growing demand for AFM technology in China, Park Systems ... communities by opening an office in Beijing equipped with Park AFM. , The Grand ...
(Date:11/9/2018)... ... November 08, 2018 , ... IC System, one of ... approach to increasing recovery rates by creating a comprehensive contact strategy for each ... developed by NLP Logix, a Jacksonville, Florida-based AI solutions company, and leveraged the ...
(Date:11/6/2018)... and TAHOE, Nev. (PRWEB) , ... November 06, ... ... to their native mobile app for clinical trial data collection and management. ... Now, iPhone users with compatible generation devices can quickly and easily sign in ...
Breaking Biology Technology:
Cached News: