Talk:Trinucleotide repeat disorder

message: Explanation for increased viability of trinucleotide repeats compared to di/tetra repeats lies in that tri nucleotide repeats' extension and contraction does NOT cause FRAMESHIFT while other do.  —Preceding unsigned comment added by 89.1.40.121 (talk) 00:54, 10 March 2008 (UTC)
thread_title:  Non-viable di/tetra repeats 

message: Trinucleotide disorders, such as Huntington's disease, can be inherited in a mendelian pattern.  Fragile X is definitely non-mendelian, but with Huntingonton's it's more complicated. Huntington's can be non-mendelian or mendelian inheritance b/c the repeats can expand during cell cycles, and cross a threshold from silent phenotype to dominant inheritance.  So, it's not exactly mendelian, but calling it "non-mendelian" will be confusing to readers without a background in genetics.  It would be especially confusing since, in clinical terms, once a disease like Huntington's appears in a family, it will continue to be inherited in a mendelian, autosomal dominant way.  So, repeat disease can be mendelian or non-mendelian, depending on the case.  Maybe we can work on explaining this, but it might be beyond the scope of the article.  Also, the citation for the sentence didn't state that trincleotide repeat disorders are non-mendelian.  Txh190 (talk) 1:59, 20 June 2008 (UTC)
replies: text: In the case of repeat expansion diseases, the term "non-Mendelian" is meant to refer to the fact that there is not a 1-to-1 transmission of the exact same mutation from parent to child.  The mutation is in the same gene, and the probabilities of inheriting an abnormal number of repeats still follow Mendelian rules.  But because the mutation itself has changed somewhat (i.e. the number of repeats has changed), scientists in the field often refer to this as non-Mendelian inheritance.  And the phenomenon of "genetic anticipation" inherent with these diseases adds another level of complication to the inheritance pattern.  A parent can have a larger-than-normal number of repeats, but not enough repeats to cause the disease (this is a pre-mutation allele).  But when the number of repeats increases in the next generation, the disease seems to suddenly appear in this family, even though the expanded repeat may have been in the family for a generation or two before it became large enough to be a disease-causing allele.  The main point is that these are a very unique class of mutations that do not perfectly fit the classical rules of Mendelian inheritance.  I can see how the term "non-Mendelian" can be confusing, and technically it's still not a completely accurate term, but we still use it when referring to the repeat expansion diseases.  My suggestion would be to put back the mention of "non-Mendelian" inheritance (since it is a commonly used term in the scientific literature when referring to these diseases) but explain what is meant by this term in the context of this special class of mutations. Beth L Rogers (talk) 02:57, 23 July 2009 (UTC)
thread_title:  Removed statement that trinucleotide repeat disorders are inherited in "non-mendelian" manner 

message: Just found this article on polyglutamine aggregation: http://hmg.oxfordjournals.org/cgi/content/full/12/suppl_2/R173. LeeVJ (talk) 11:56, 1 September 2008 (UTC)
thread_title:  Free full text article 

message: I'm trying not to be overly critical, but I came across this article and am somewhat frustrated.  I realize that this is a very large topic, and no article can completely cover everything.  I did my Ph.D. dissertation on repeat expansion diseases, so I realize that I might be a lot more picky about some of these things.  For this reason I have decided not to attempt to edit this page because: a) I wouldn't know where to start, b) people would probably become frustrated by the amount of detail I would include and consider the article to be "way too much information" (understandably), and c) unfortunately I don't have as much free time as I wish I did to contribute to some of the pages here.  In general I think that current and future versions of this article should keep in mind the following considerations (many of which apply in general to any article dealing with any expanding field of knowledge):  
Since this is such a large topic, it is unrealistic to expect all of the information to reflect up-to-the-minute developments.  Therefore, it is important to stress that the precise mechanisms of how repeat expansions occur are not well understood.  Also, for some of the diseases, the mechanisms of how the repeat expansion mutations cause the symptoms of the diseases are not well understood. There are several hypotheses and opposing schools of thought as to how and when the expansion mutations occur in the first place (replication vs. recombination, DNA slippage vs. evasion of DNA repair, or various combinations of these processes and others).  You may come across a scientific journal article where the author gives the impression of having the definitive and final answer on these mechanisms.  However, it is not uncommon to meet scientists who think they have all the answers to everything -- I happen to work with several of them.  But the truth is that we still have much more to learn in this field, so any mention of a particular mechanism should be clarified as being one of the several hypothesis that are still under debate.   
While much of the information is outdated and/or incomplete, this is of course to be expected in scientific articles where the field is always expanding.  Contributors should be careful to point this out whenever appropriate so that newcomers to the topic will not be led to believe that the statements made are the final word on the topic.  I have added links to PubMed  and a few other "real-time" resources that would be helpful for those who  want more information:  
PubMed (http://www.ncbi.nlm.nih.gov/pubmed/).  Although many of these articles are highly specialized and probably beyond the scope of what many readers are interested in, there is an option to search for "Review" articles only, and these tend to be a bit more reader-friendly.
 
National Institute of Neurological Disorders and Stroke (http://www.ninds.nih.gov/disorders/disorder_index.htm). This is a useful resource since many of the repeat expansion diseases are neurological or neuromuscular disorders.
Genetics Home Reference (http://ghr.nlm.nih.gov/).  This is maintained by the NIH and National Library of Medicine.  Much of the information is written for non-experts, but even as a geneticist I often refer to these pages as a starting point for information on diseases that are outside my area of expertise.
Once again, I don't want to be too critical, but I also think it is important for contributors to keep in mind that many topics in science (and other fields) are constantly changing.  It is important to indicate whether or not a topic is still not well understood or is still under debate.
Beth L Rogers (talk) 21:36, 24 June 2009 (UTC)
replies: text: Thankyou for your comments (constructive critism is always useful ), your concerns tally with the medicine projects guidelines ( see WP:MEDMOS and WP:RS ), which one day will have been applied to all articles (hopefully), in the meantime if you have any further specific amendments please add and this will aid any editors that arrive, L∴V 11:46, 30 June 2009 (UTC)
thread_title:  General Problems  

message: I'm not sure how to import the little info box for it (if there is one), but this article doesn't comply with WP:TONE.
horsedreamer 16:47, 9 March 2015 (UTC)
thread_title:  Very casually/conversationally written. 

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thread_title:  External links modified 

message: I am planning to work on a repeat expansion disorder page (which is a superset of trinucleotide repeat expansion disorders). This may be repeating a lot of the information on this page. We can then decide how these two articles will complement each other. TrickyTank (talk) 02:24, 28 November 2023 (UTC)
thread_title:  Working on repeat expansion disorder page