Dr. Geoffrey Sher on June 1, 2017 at 3:59 pm

maria,

In my opinion, it is not possible to reliably distinguish between Mei0tically aneuploid and Mitotically aneuploid (mosaic) embryos in the lab, unless you dissect out and test each individual cell in the embryo. I do NOT buy into the “definitive” diagnosis of mosaicism. I do believe that embryos with single chromosomal defects are more likely to be mosaic. Most embryos that are complex aneuploid (involving several chromosomes) are in my opinion Meiotically aneuploid and are unable to autocorrect in-utero. They will likely not propagate viable pregnancies under any circumstances. With the exception of XO monosomies, all autosomal monosomies are almost always fatal and as such will not result in viable pregnancies. Thus when I select aneuploid for transfer in the hope that they are mosaic and will autocorrect in-utero, I choose those with autosomal monosomies.

Here is some context:
Human embryo development occurs through a process that encompasses reprogramming, sequential cleavage divisions and mitotic chromosome segregation and embryonic genome activation. Chromosomal abnormalities may arise during germ cell and/or pre-implantation embryo development, and represents a major cause of early pregnancy loss. About a decade ago, I and an associate, Levent Keskintepe Ph.D were the first to introduce full embryo karyotyping (identification of all 46 chromosomes) through preimplantation genetic sampling (PGS) as a method by which to selectively transfer only euploid embryos (i.e. those that have a full component of chromosomes) to the uterus. We subsequently reported on a 2-3 fold improvement in implantation and birth rates as well as a significant reduction in early pregnancy loss, following IVF. Since then PGS has grown dramatically in popularity such that it is now widely used throughout the world.
Most IVF programs that offer PGS services, require that all participating patients consent to all their aneuploid embryos (i.e. those with an irregular quota of chromosomes) be disposed of. However, there is now growing evidence to suggest that following embryo transfer, some aneuploid embryos will in the process of ongoing development, convert to the euploid state (i.e. “autocorrection”) and then go on to develop into chromosomally normal offspring. In fact, I am personally aware of several such cases occurring within our IVF network. So clearly , summarily discarding all aneuploid embryos as a matter of routine we are sometimes destroying some embryos that might otherwise have “autocorrected” and gone on to develop into normal offspring.
Thus by discarding aneuploid embryos the possibility exists that we could be denying some women the opportunity of having a baby. This creates a major ethical and moral dilemma for those of us that provide the option of PGS to our patients. On the one hand, we strive “to avoid knowingly doing harm” (the Hippocratic Oath) and as such would prefer to avoid or minimize the risk of miscarriage and/or chromosomal birth defects and on the other hand we would not wish to deny patients with aneuploid embryos, the opportunity to have a baby.
The basis for such embryo “autocorrection” lies in the fact that some embryos found through PGS-karyotyping to harbor one or more aneuploid cells (blastomeres) will often also harbor chromosomally normal (euploid) cells (blastomeres). The coexistence of both aneuploid and euploid cells coexisting in the same embryo is referred to as “mosaicism.” As stated, some mosaic embryos will In the process of subsequent cell replication convert to the normal euploid state (i.e. autocorrect)
It is against this background, that an ever increasing number of IVF practitioners, rather than summarily discard PGS-identified aneuploid embryos are now choosing to cryobanking (freeze-store) certain of them, to leave open the possibility of ultimately transferring them to the uterus. In order to best understand the complexity of the factors involved in such decision making, it is essential to understand the causes of embryo aneuploidy of which there are two varieties:
1.Meiotic aneuploidy” results from aberrations in chromosomal numerical configuration that originate in either the egg (most commonly) and/or in sperm, during preconceptual maturational division (meiosis). Since meiosis occurs in the pre-fertilized egg or in and sperm, it follows that when aneuploidy occurs due to defective meiosis, all subsequent cells in the developing embryo/blastocyst/conceptus inevitably will be aneuploid, precluding subsequent “autocorrection”. Meiotic aneuploidy will thus invariably be perpetuated in all the cells of the embryo as they replicate. It is a permanent phenomenon and is irreversible. All embryos so affected are thus fatally damaged. Most will fail to implant and those that do implant will either be lost in early pregnancy or develop into chromosomally defective offspring (e.g. Down syndrome, Edward syndrome, Turner syndrome).
2.“Mitotic aneuploidy” occurs when following fertilization and subsequent cell replication (cleavage), some cells (blastomeres) of a meiotically euploid early embryo mutate and become aneuploid. This is referred to as mosaicism. Thereupon, with continued subsequent cell replication (mitosis) the chromosomal make-up (karyotype) of the embryo might either comprise of predominantly aneuploid cells or euploid cells. The subsequent viability or competency of the conceptus will thereupon depend on whether euploid or aneuploid cells predominate. If in such mosaic embryos aneuploid cells predominate, the embryo will be “incompetent”). If (as is frequently the case) euploid cells prevail, the mosaic embryo will be “competent” and capable of propagating a normal conceptus.
Since some mitotically aneuploid (“mosaic”) embryos can, and indeed do “autocorrect’ while meiotically aneuploid embryos cannot, it follows that an ability to differentiate between these two varieties of aneuploidy would be of considerable clinical value. And would provide a strong argument in favor of preserving certain aneuploid embryos for future dispensation.
Aneuploidy, involves the addition (trisomy) or subtraction (monosomy) of one chromosome in a given pair. As previously stated, some aneuploidies are meiotic in origin while others are mitotic “mosaics”. Certain aneuploidies involve only a single, chromosome pair (simple aneuploidy) while others involve more than a single pair (i.e. complex aneuploidy). Aside from monosomy involving absence of the y-sex chromosome (i.e. XO) which can resulting in a live birth (Turner syndrome) all monosomies involving autosomes (non-sex chromosomes) are lethal and will not result in viable offspring). Some autosomal meiotic aneuploidies, especially trisomies 13, 18, 21, can progress to viable, but severely chromosomally defective babies. All other meiotic autosomal trisomies will almost invariably, either not attach to the uterine lining or upon attachment, will soon be rejected. All forms of meiotic aneuploidy are irreversible while mitotic aneuploidy (“mosaicism) often autocorrects in the uterus. Most complex aneuploidies are meiotic in origin and will almost invariably fail to propagate viable pregnancies.
There is presently no microscopic or genetic test that can reliable differentiate between meiotic and mitotic aneuploidy. Notwithstanding this, the fact that some “mosaic” embryos can autocorrect in the uterus, makes a strong argument in favor of transferring aneuploid of embryos in the hope that the one(s) transferred might be “mosaic” and might propagate viable healthy pregnancies. On the other hand, it is the fear that embryo aneuploidy might result in a chromosomally abnormal baby that has led many IVF physicians to strongly oppose the transfer of any aneuploid embryos to the uterus.
While certain meiotic aneuploid trisomies (e.g. trisomies 13, 18, & 21) can and sometimes do result in chromosomally defective babies, no other meiotic autosomal trisomies can do so. Thus the transfer of trisomic embryos in the hope that one or more might be mosaic, should exclude the use of embryos with trisomies 13, 18 or 21. Conversely, no autosomal monosomic embryos are believed to be capable of resulting in viable pregnancies, thereby making the transfer of autosomally monosomic embryos, in the hope that they are “mosaic”, a far less risky proposition. Needless to say, if such action is being contemplated, it is absolutely essential to make full disclosure to the patient (s) , and to insure the completion of a detailed informed consent agreement which would include a commitment by the patient (s) to undergo prenatal genetic testing aimed at excluding a chromosomal defect in the developing baby and/or a willingness to terminate the pregnancy should a serious birth defect be diagnosed.

I strongly recommend that you visit http://www.DrGeoffreySherIVF.com. Then go to my Blog and access the “search bar”. Type in the titles of any/all of the articles listed below, one by one. “Click” and you will immediately be taken to those you select. Please also take the time to post any questions or comments with the full expectation that I will (as always) respond promptly.
•Preimplantation Genetic Testing (PGS) in IVF: It should be Used Selectively and NOT be Routine.
•IVF: Selecting the Best Quality Embryos to Transfer
•Preimplantation Genetic Sampling (PGS) Using: Next Generation Gene Sequencing (NGS): Method of Choice.
•PGS and Assessment of Egg/Embryo “competency”: How Method, Timing and Methodology Could Affect Reliability
•Treating Out-of-State and Out-of-Country Patients at Sher-IVF in Las Vegas
•Should IVF Treatment Cycles be provided uninterrupted or be Conducted in 7-12 Pre-scheduled “Batches” per Year
•A personalized, stepwise approach to IVF
•How Many Embryos should be transferred: A Critical Decision in IVF.
•My Retirement in the Year Ahead: A letter of Thanks From me to You!

ANNOUNCEMENTS:
1.About my Retirement by mid-2018:
After > 30 years in the field of Assisted Reproduction (AR), the time has finally come for me to plan on retiring from full-time clinical medicine within a year. If you are interested in my medical services prior to my retirement, I urge you to contact my concierge, Julie Dahan ASAP to set up a Skype or an in-person consultation with me. You can also contact Julie by phone or via email at 702-533-2691/ Julied@sherivf.com. You can also apply online at http://www.SherIVF.com.

2.The 4th edition of my newest book ,
“In Vitro Fertilization, the ART of Making Babies” is now available as a down-load through http://www.Amazon.com or from most bookstores and public libraries.

Geoffrey Sher MD

19,771 Comments

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John on June 2, 2017 at 1:31 am

Thanks Dr. Sher for providing this way to communicate. I can’t seem to find any current data/research/answers for our scenario.
My wife (currently 43 y.o Filipina of good health and BMI) miscarried at 13 weeks in Jan 2016. All looked good at the last u/s but she did have sub chorionic hemorrhage early on. Pregnancy resulted from a frozen embryo transfer using her 31 y.o. niece’s fresh eggs which 8 of 13 were fertilized at that time.
There are 5 remaining frozen eggs. Would it be better to fertilize the eggs and freeze the embryos and do a frozen transfer or do a fresh transfer? Our concern is with having the best chances for a successful pregnancy. Our IVF doctor is good either way, but slightly favors one option more. What are your thoughts?
Thank you.
- Dr. Geoffrey Sher on June 2, 2017 at 6:04 am
  
  There would be no downside to thawing and fertilizing the eggs and then vitrifying the expanded blastocysts for subsequent FET….in my opinion.
  
  That is what I would recommend. At least then you would know what you have to work with and of course the convenience of precision timing.
  
  Geoff Sher
Maria on June 1, 2017 at 6:00 pm

I am 2 days post 5 days transfer and just realized i forgot to take lovenox this AM! i always take around 7 am. now it’s 3 pm. so that’s like 8 hours late. I am taking it now. Will this matter? I’ve been on it already for about 2.5/3 weeks. dose is 60, once a day.
- Dr. Geoffrey Sher on June 1, 2017 at 8:09 pm
  
  Wont matter!
  
  Good luck!
  
  Geoff Sher
Jane on June 1, 2017 at 5:35 pm

Dr Sher,

We are doing long Lupron with Follistim 300 and Menopur 75 starting day 3. On my day 6 of sims US I have 13 follicles over 1 cm but my E2 is only 468 with LH of 0.2. I’m worried that the E2 and LH are so low for this many follicles, should I increase the Menopur dose to 150?
- Dr. Geoffrey Sher on June 1, 2017 at 8:10 pm
  
  It is far too early to expect a higher response. I would suggest that you stay the course.
  
  Good luck!
  
  Geoff Sher
Maria on June 1, 2017 at 1:53 pm

When a patient chooses to transfer an aneuplioid embryo, what criteria do use to determine if one is suitable for transfer? I have 4 embryos that are mosaic each with a partial duplication of part of a chromosome. I also have monosomy embryos that are not mosaic. From my reading, it seems mosaic monosomy embryos are the “safest” as monosomies are more frequently lethal in utero. I’m not sure if it’s worth the risk as I have researched and none of the genetic issues on my embryos are ‘lethal’. We’ve transferred 6 euploid embryos to date with no success.
- Dr. Geoffrey Sher on June 1, 2017 at 3:59 pm
  
  maria,
  
  In my opinion, it is not possible to reliably distinguish between Mei0tically aneuploid and Mitotically aneuploid (mosaic) embryos in the lab, unless you dissect out and test each individual cell in the embryo. I do NOT buy into the “definitive” diagnosis of mosaicism. I do believe that embryos with single chromosomal defects are more likely to be mosaic. Most embryos that are complex aneuploid (involving several chromosomes) are in my opinion Meiotically aneuploid and are unable to autocorrect in-utero. They will likely not propagate viable pregnancies under any circumstances. With the exception of XO monosomies, all autosomal monosomies are almost always fatal and as such will not result in viable pregnancies. Thus when I select aneuploid for transfer in the hope that they are mosaic and will autocorrect in-utero, I choose those with autosomal monosomies.
  
  Here is some context:
  Human embryo development occurs through a process that encompasses reprogramming, sequential cleavage divisions and mitotic chromosome segregation and embryonic genome activation. Chromosomal abnormalities may arise during germ cell and/or pre-implantation embryo development, and represents a major cause of early pregnancy loss. About a decade ago, I and an associate, Levent Keskintepe Ph.D were the first to introduce full embryo karyotyping (identification of all 46 chromosomes) through preimplantation genetic sampling (PGS) as a method by which to selectively transfer only euploid embryos (i.e. those that have a full component of chromosomes) to the uterus. We subsequently reported on a 2-3 fold improvement in implantation and birth rates as well as a significant reduction in early pregnancy loss, following IVF. Since then PGS has grown dramatically in popularity such that it is now widely used throughout the world.
  Most IVF programs that offer PGS services, require that all participating patients consent to all their aneuploid embryos (i.e. those with an irregular quota of chromosomes) be disposed of. However, there is now growing evidence to suggest that following embryo transfer, some aneuploid embryos will in the process of ongoing development, convert to the euploid state (i.e. “autocorrection”) and then go on to develop into chromosomally normal offspring. In fact, I am personally aware of several such cases occurring within our IVF network. So clearly , summarily discarding all aneuploid embryos as a matter of routine we are sometimes destroying some embryos that might otherwise have “autocorrected” and gone on to develop into normal offspring.
  Thus by discarding aneuploid embryos the possibility exists that we could be denying some women the opportunity of having a baby. This creates a major ethical and moral dilemma for those of us that provide the option of PGS to our patients. On the one hand, we strive “to avoid knowingly doing harm” (the Hippocratic Oath) and as such would prefer to avoid or minimize the risk of miscarriage and/or chromosomal birth defects and on the other hand we would not wish to deny patients with aneuploid embryos, the opportunity to have a baby.
  The basis for such embryo “autocorrection” lies in the fact that some embryos found through PGS-karyotyping to harbor one or more aneuploid cells (blastomeres) will often also harbor chromosomally normal (euploid) cells (blastomeres). The coexistence of both aneuploid and euploid cells coexisting in the same embryo is referred to as “mosaicism.” As stated, some mosaic embryos will In the process of subsequent cell replication convert to the normal euploid state (i.e. autocorrect)
  It is against this background, that an ever increasing number of IVF practitioners, rather than summarily discard PGS-identified aneuploid embryos are now choosing to cryobanking (freeze-store) certain of them, to leave open the possibility of ultimately transferring them to the uterus. In order to best understand the complexity of the factors involved in such decision making, it is essential to understand the causes of embryo aneuploidy of which there are two varieties:
  1.Meiotic aneuploidy” results from aberrations in chromosomal numerical configuration that originate in either the egg (most commonly) and/or in sperm, during preconceptual maturational division (meiosis). Since meiosis occurs in the pre-fertilized egg or in and sperm, it follows that when aneuploidy occurs due to defective meiosis, all subsequent cells in the developing embryo/blastocyst/conceptus inevitably will be aneuploid, precluding subsequent “autocorrection”. Meiotic aneuploidy will thus invariably be perpetuated in all the cells of the embryo as they replicate. It is a permanent phenomenon and is irreversible. All embryos so affected are thus fatally damaged. Most will fail to implant and those that do implant will either be lost in early pregnancy or develop into chromosomally defective offspring (e.g. Down syndrome, Edward syndrome, Turner syndrome).
  2.“Mitotic aneuploidy” occurs when following fertilization and subsequent cell replication (cleavage), some cells (blastomeres) of a meiotically euploid early embryo mutate and become aneuploid. This is referred to as mosaicism. Thereupon, with continued subsequent cell replication (mitosis) the chromosomal make-up (karyotype) of the embryo might either comprise of predominantly aneuploid cells or euploid cells. The subsequent viability or competency of the conceptus will thereupon depend on whether euploid or aneuploid cells predominate. If in such mosaic embryos aneuploid cells predominate, the embryo will be “incompetent”). If (as is frequently the case) euploid cells prevail, the mosaic embryo will be “competent” and capable of propagating a normal conceptus.
  Since some mitotically aneuploid (“mosaic”) embryos can, and indeed do “autocorrect’ while meiotically aneuploid embryos cannot, it follows that an ability to differentiate between these two varieties of aneuploidy would be of considerable clinical value. And would provide a strong argument in favor of preserving certain aneuploid embryos for future dispensation.
  Aneuploidy, involves the addition (trisomy) or subtraction (monosomy) of one chromosome in a given pair. As previously stated, some aneuploidies are meiotic in origin while others are mitotic “mosaics”. Certain aneuploidies involve only a single, chromosome pair (simple aneuploidy) while others involve more than a single pair (i.e. complex aneuploidy). Aside from monosomy involving absence of the y-sex chromosome (i.e. XO) which can resulting in a live birth (Turner syndrome) all monosomies involving autosomes (non-sex chromosomes) are lethal and will not result in viable offspring). Some autosomal meiotic aneuploidies, especially trisomies 13, 18, 21, can progress to viable, but severely chromosomally defective babies. All other meiotic autosomal trisomies will almost invariably, either not attach to the uterine lining or upon attachment, will soon be rejected. All forms of meiotic aneuploidy are irreversible while mitotic aneuploidy (“mosaicism) often autocorrects in the uterus. Most complex aneuploidies are meiotic in origin and will almost invariably fail to propagate viable pregnancies.
  There is presently no microscopic or genetic test that can reliable differentiate between meiotic and mitotic aneuploidy. Notwithstanding this, the fact that some “mosaic” embryos can autocorrect in the uterus, makes a strong argument in favor of transferring aneuploid of embryos in the hope that the one(s) transferred might be “mosaic” and might propagate viable healthy pregnancies. On the other hand, it is the fear that embryo aneuploidy might result in a chromosomally abnormal baby that has led many IVF physicians to strongly oppose the transfer of any aneuploid embryos to the uterus.
  While certain meiotic aneuploid trisomies (e.g. trisomies 13, 18, & 21) can and sometimes do result in chromosomally defective babies, no other meiotic autosomal trisomies can do so. Thus the transfer of trisomic embryos in the hope that one or more might be mosaic, should exclude the use of embryos with trisomies 13, 18 or 21. Conversely, no autosomal monosomic embryos are believed to be capable of resulting in viable pregnancies, thereby making the transfer of autosomally monosomic embryos, in the hope that they are “mosaic”, a far less risky proposition. Needless to say, if such action is being contemplated, it is absolutely essential to make full disclosure to the patient (s) , and to insure the completion of a detailed informed consent agreement which would include a commitment by the patient (s) to undergo prenatal genetic testing aimed at excluding a chromosomal defect in the developing baby and/or a willingness to terminate the pregnancy should a serious birth defect be diagnosed.
  
  I strongly recommend that you visit http://www.DrGeoffreySherIVF.com. Then go to my Blog and access the “search bar”. Type in the titles of any/all of the articles listed below, one by one. “Click” and you will immediately be taken to those you select. Please also take the time to post any questions or comments with the full expectation that I will (as always) respond promptly.
  •Preimplantation Genetic Testing (PGS) in IVF: It should be Used Selectively and NOT be Routine.
  •IVF: Selecting the Best Quality Embryos to Transfer
  •Preimplantation Genetic Sampling (PGS) Using: Next Generation Gene Sequencing (NGS): Method of Choice.
  •PGS and Assessment of Egg/Embryo “competency”: How Method, Timing and Methodology Could Affect Reliability
  •Treating Out-of-State and Out-of-Country Patients at Sher-IVF in Las Vegas
  •Should IVF Treatment Cycles be provided uninterrupted or be Conducted in 7-12 Pre-scheduled “Batches” per Year
  •A personalized, stepwise approach to IVF
  •How Many Embryos should be transferred: A Critical Decision in IVF.
  •My Retirement in the Year Ahead: A letter of Thanks From me to You!
  
  ANNOUNCEMENTS:
  1.About my Retirement by mid-2018:
  After > 30 years in the field of Assisted Reproduction (AR), the time has finally come for me to plan on retiring from full-time clinical medicine within a year. If you are interested in my medical services prior to my retirement, I urge you to contact my concierge, Julie Dahan ASAP to set up a Skype or an in-person consultation with me. You can also contact Julie by phone or via email at 702-533-2691/ Julied@sherivf.com. You can also apply online at http://www.SherIVF.com.
  
  2.The 4th edition of my newest book ,
  “In Vitro Fertilization, the ART of Making Babies” is now available as a down-load through http://www.Amazon.com or from most bookstores and public libraries.
  
  Geoffrey Sher MD
A. on June 1, 2017 at 9:29 am

Dr Sher,

We just delivered our first baby after our second IVF transfer. We are over the moon for our little one. She was however delivered via c section. I am concerened that this may affect future attempts for siblings for our daughter. What is your opinion on IVF after c section? Is this a concern I need to have about it effecting future success with IVF? Thank you!

A. Brascetta
- Dr. Geoffrey Sher on June 1, 2017 at 10:43 am
  
  It should have no detrimental effect on future IVF’s.
  
  Congratulations and good luck!
  
  Geoff Sher

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