Re: Histones (proteins that form the scaffolding around which DNA wraps itself may also themselves be involved in heredity processes
From: John Mikes To: everything-list@googlegroups.com Sent: Tuesday, April 7, 2015 2:03 PM Subject: Re: Histones (proteins that form the scaffolding around which DNA wraps itself may also themselves be involved in heredity processes Apologies: MITOCHONDRIUM - I S - and mitochondria -are. JM On Tue, Apr 7, 2015 at 4:14 PM, John Mikes wrote: Liz:"passed on" - do you mean survives AS IS? I think whatever is added incubates into the complexity of the new creature into fitting, not 'as was' in the mother. And- I think mitochondria IS a cell within the larger one in symbiotic life. Chris is most likely right: FROM THE MOTHER only. And it is adjusted into the new complexity as well. This is the reason why mitochondria are used as a yardstick to measure the natural rate of mutation (e.g. the genetic drift). Because all animals exclusively get their own mitochondria from their mother -- e.g. NOT by sexual reproduction, which effectively is a shuffling of the genetic heritage of both portions of both parents DNA. The mitochondria DNA instead only ever comes from the maternal line and for this reason it makes a good genetic clock. A clock that can be used to estimate how old a species is, or that can tell a story of how a species almost went extinct some 70,000 years ago -- as happened to our own species. The reason e know this is by studying the genetic diversity of human mitochondrial DNA.Interestingly the Y chromosome, which all males of a species carry and exclusively get from the paternal side, can also function as a yardstick, again because it is unaffected by sexual reproduction. If an offspring has the Y chromosome (e.g. is a male) it got it from its father and never ever got it from its mother. For all our other chromosomes what we get is the sexually reshuffled recombined deck of cards, some of which came from each parent.Does this make any sense?Chris JM On Tue, Apr 7, 2015 at 12:18 AM, LizR wrote: Anything in the egg cell, or donated at any point during gestation from the mother (in mammals, at least) can be passed on, I assume. (What about mitochondria?) -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: Histones (proteins that form the scaffolding around which DNA wraps itself may also themselves be involved in heredity processes
Apologies: MITOCHONDRIUM - I S - and mitochondria -are. JM On Tue, Apr 7, 2015 at 4:14 PM, John Mikes wrote: > Liz: > "passed on" - do you mean survives AS IS? I think whatever is added > incubates into the complexity of the new creature into fitting, not 'as > was' in the mother. > And- I think mitochondria IS a cell within the larger one in symbiotic > life. Chris is most likely right: FROM THE MOTHER only. And it is adjusted > into the new complexity as well. > JM > > On Tue, Apr 7, 2015 at 12:18 AM, LizR wrote: > >> Anything in the egg cell, or donated at any point during gestation from >> the mother (in mammals, at least) can be passed on, I assume. (What about >> mitochondria?) >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Everything List" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to everything-list+unsubscr...@googlegroups.com. >> To post to this group, send email to everything-list@googlegroups.com. >> Visit this group at http://groups.google.com/group/everything-list. >> For more options, visit https://groups.google.com/d/optout. >> > > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: Histones (proteins that form the scaffolding around which DNA wraps itself may also themselves be involved in heredity processes
Liz: "passed on" - do you mean survives AS IS? I think whatever is added incubates into the complexity of the new creature into fitting, not 'as was' in the mother. And- I think mitochondria IS a cell within the larger one in symbiotic life. Chris is most likely right: FROM THE MOTHER only. And it is adjusted into the new complexity as well. JM On Tue, Apr 7, 2015 at 12:18 AM, LizR wrote: > Anything in the egg cell, or donated at any point during gestation from > the mother (in mammals, at least) can be passed on, I assume. (What about > mitochondria?) > > -- > You received this message because you are subscribed to the Google Groups > "Everything List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to everything-list+unsubscr...@googlegroups.com. > To post to this group, send email to everything-list@googlegroups.com. > Visit this group at http://groups.google.com/group/everything-list. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
RE: Histones (proteins that form the scaffolding around which DNA wraps itself may also themselves be involved in heredity processes
From: everything-list@googlegroups.com [mailto:everything-list@googlegroups.com] On Behalf Of LizR Sent: Monday, April 06, 2015 9:19 PM To: everything-list@googlegroups.com Subject: Re: Histones (proteins that form the scaffolding around which DNA wraps itself may also themselves be involved in heredity processes Anything in the egg cell, or donated at any point during gestation from the mother (in mammals, at least) can be passed on, I assume. (What about mitochondria?) Mitochondria comes from mom; it is exclusively matrilineal -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: Histones (proteins that form the scaffolding around which DNA wraps itself may also themselves be involved in heredity processes
Anything in the egg cell, or donated at any point during gestation from the mother (in mammals, at least) can be passed on, I assume. (What about mitochondria?) -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
RE: Histones (proteins that form the scaffolding around which DNA wraps itself may also themselves be involved in heredity processes
The process of heredity may have more levels of actors in it than just the DNA itself. An interesting notion that seems logical; a case of living processes employing various different strategies in parallel, which would seem a plausible result of a process of random selection based on environmental fitness. Chris DNA can't explain all inherited biological traits, research shows http://www.sciencedaily.com/releases/2015/04/150402161751.htm Characteristics passed between generations are not decided solely by DNA, but can be brought about by other material in cells, new research shows. Scientists studied proteins found in cells, known as histones, which are not part of the genetic code, but act as spools around which DNA is wound. Histones are known to control whether or not genes are switched on. Quoting two paragraphs from the article here: Researchers found that naturally occurring changes to these proteins, which affect how they control genes, can be sustained from one generation to the next and so influence which traits are passed on. The finding demonstrates for the first time that DNA is not solely responsible for how characteristics are inherited. It paves the way for research into how and when this method of inheritance occurs in nature, and if it is linked to particular traits or health conditions. It may also inform research into whether changes to the histone proteins that are caused by environmental conditions -- such as stress or diet -- can influence the function of genes passed on to offspring. -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
