1 00:00:00,644 --> 00:00:03,540 [Dr. Bob Wildin] Okay, just a really quick rundown 2 00:00:03,540 --> 00:00:05,550 on clinical diagnostic criteria, 3 00:00:05,550 --> 00:00:09,957 an overview for this dysmorphology 4 00:00:09,957 --> 00:00:13,140 and clinical assessment module. 5 00:00:13,140 --> 00:00:17,640 So, clinical diagnostic criteria are basically developed 6 00:00:17,640 --> 00:00:21,704 for disorders with significant overlap 7 00:00:21,704 --> 00:00:26,280 so that some clarity can be had with regard to 8 00:00:26,280 --> 00:00:31,280 what the specific disorder is, and whether it meets sort of, 9 00:00:33,030 --> 00:00:36,630 a minimal threshold for being diagnosed 10 00:00:36,630 --> 00:00:38,160 below that threshold. 11 00:00:38,160 --> 00:00:42,300 The specificity of that diagnosis tends to fail. 12 00:00:42,300 --> 00:00:46,350 So they're typically based on large groups 13 00:00:46,350 --> 00:00:48,930 of collaborative data, different clinics, 14 00:00:48,930 --> 00:00:52,800 different sites who come together and compare 15 00:00:52,800 --> 00:00:55,530 their clinical data on physical features, 16 00:00:55,530 --> 00:00:59,670 on ages of onset, behaviors, things like that. 17 00:00:59,670 --> 00:01:04,670 And they come up with, basically a model 18 00:01:04,980 --> 00:01:09,540 where the clinical diagnostic threshold is set, 19 00:01:09,540 --> 00:01:13,240 such that it much more often 20 00:01:14,760 --> 00:01:19,533 correctly diagnoses a patient than incorrectly, 21 00:01:20,970 --> 00:01:23,640 and it may include some scoring systems. 22 00:01:23,640 --> 00:01:27,180 An example that's used in joint hyper-mobility system 23 00:01:27,180 --> 00:01:31,050 is the Beighton, B-E-I-G-H-T-O-N scoring system, 24 00:01:31,050 --> 00:01:34,200 which is basically a standardized score 25 00:01:36,420 --> 00:01:39,783 for generalized joint hyper-mobility. 26 00:01:40,830 --> 00:01:44,190 These criteria tend not to be strictly exclusionary, 27 00:01:44,190 --> 00:01:46,830 meaning that if you don't meet the criteria, 28 00:01:46,830 --> 00:01:50,190 it doesn't necessarily exclude that diagnosis. 29 00:01:50,190 --> 00:01:55,190 But you ought to think twice about relying totally 30 00:01:55,860 --> 00:01:58,860 on that diagnosis because you may be missing something else. 31 00:02:00,690 --> 00:02:03,630 Because the data and the support 32 00:02:03,630 --> 00:02:07,505 and the delineation of individual subtypes of disorders 33 00:02:07,505 --> 00:02:10,800 vary over time as we learn more and more about them, 34 00:02:10,800 --> 00:02:14,313 and we see more patients with more variations of them, 35 00:02:15,990 --> 00:02:17,700 the disease classification systems 36 00:02:17,700 --> 00:02:22,140 and the diagnostic criteria tend to change every, 37 00:02:22,140 --> 00:02:24,360 you know, five, 10, 15 years. 38 00:02:24,360 --> 00:02:26,730 So you do want to kind of try to look for 39 00:02:26,730 --> 00:02:28,713 the most recent version, 40 00:02:29,640 --> 00:02:31,800 because those are the most authoritative 41 00:02:31,800 --> 00:02:35,730 and the most supported by current evidence. 42 00:02:35,730 --> 00:02:38,760 So examples of clinical diagnostic criteria 43 00:02:38,760 --> 00:02:40,473 include those for Marfan syndrome, 44 00:02:41,400 --> 00:02:45,450 for neurofibromatosis type one, 45 00:02:45,450 --> 00:02:48,573 and for Ehlers-Danlos syndrome of multiple types. 46 00:02:49,440 --> 00:02:51,720 I use those clinical diagnostic criteria 47 00:02:51,720 --> 00:02:56,720 to help me decide who needs genetic testing, 48 00:02:57,690 --> 00:03:01,680 and who will not benefit from genetic testing, 49 00:03:01,680 --> 00:03:04,200 and who needs to be followed, prospectively, 50 00:03:04,200 --> 00:03:06,813 with screening procedures. 51 00:03:08,070 --> 00:03:09,840 So, for example, on Marfan syndrome, 52 00:03:09,840 --> 00:03:14,790 most of the time I do a Marfan syndrome evaluation 53 00:03:14,790 --> 00:03:16,020 plus an echocardiogram. 54 00:03:16,020 --> 00:03:19,440 Two evaluations give me a pretty good idea 55 00:03:19,440 --> 00:03:21,993 as to whether or not Marfan syndrome is present. 56 00:03:22,920 --> 00:03:27,360 When things are unclear is when I resort to clinical, 57 00:03:27,360 --> 00:03:31,380 genetic gene sequencing for Marfan syndrome. 58 00:03:31,380 --> 00:03:34,023 The same is true of neurofibromatosis type one. 59 00:03:35,580 --> 00:03:39,330 I often get children who are referred 60 00:03:39,330 --> 00:03:43,440 for multiple cafe-au-lait spots on the skin, 61 00:03:43,440 --> 00:03:45,300 which are themselves benign. 62 00:03:45,300 --> 00:03:46,770 Often they're not present at birth, 63 00:03:46,770 --> 00:03:48,720 they develop in the first couple years of life, 64 00:03:48,720 --> 00:03:52,260 and then they may add more and more spots 65 00:03:52,260 --> 00:03:55,861 or they may become more evident over time. 66 00:03:55,861 --> 00:04:00,000 So having some criteria about what is 67 00:04:00,000 --> 00:04:03,810 just a normal amount of hyperpigmented spots 68 00:04:03,810 --> 00:04:08,810 and what constitutes an increased risk for neurofibromatosis 69 00:04:08,940 --> 00:04:11,970 is an important distinction with respect to follow up. 70 00:04:11,970 --> 00:04:16,970 So that's a system that I use frequently as well. 71 00:04:17,070 --> 00:04:18,150 Ehlers Danlos syndrome, 72 00:04:18,150 --> 00:04:22,470 as I mentioned in the previous lecture, has multiple types, 73 00:04:22,470 --> 00:04:25,920 and the differentiation of those has changed over time. 74 00:04:25,920 --> 00:04:30,450 So I try to use a classification system 75 00:04:30,450 --> 00:04:32,341 and the diagnostic criteria therein 76 00:04:32,341 --> 00:04:37,341 to help define who meets the baseline diagnosis 77 00:04:38,550 --> 00:04:41,100 for Ehlers Danlos syndrome of any type, 78 00:04:41,100 --> 00:04:44,400 much less specific, more concerning types, 79 00:04:44,400 --> 00:04:46,503 such as the vascular ecchymotic type. 80 00:04:47,460 --> 00:04:50,760 So that's a quick overview of clinical diagnostic criteria 81 00:04:50,760 --> 00:04:52,869 and how they're used in the context 82 00:04:52,869 --> 00:04:57,723 of dysmorphology and syndrome diagnosis. 83 00:05:00,510 --> 00:05:02,100 Hi, it's Dr. Bob Wildin again. 84 00:05:02,100 --> 00:05:07,100 I wanted to bring to light some excellent online resources 85 00:05:07,959 --> 00:05:11,340 regarding dysmorphology and syndrome diagnosis. 86 00:05:11,340 --> 00:05:12,760 These are just to supplement 87 00:05:13,710 --> 00:05:18,710 the reading and lecture materials, 88 00:05:18,780 --> 00:05:22,020 and these are resources that you can continue to use 89 00:05:22,020 --> 00:05:24,753 well after the course has completed. 90 00:05:26,100 --> 00:05:30,360 So the first one is a catalog of dysmorphic features, 91 00:05:30,360 --> 00:05:32,970 called "The Elements of Morphology," 92 00:05:32,970 --> 00:05:37,560 and it is a compendium of standardized terminology 93 00:05:37,560 --> 00:05:42,560 that was arrived at by consensus among dysmorphologists. 94 00:05:42,900 --> 00:05:47,900 It contains an organization, basically by body part, 95 00:05:48,090 --> 00:05:51,300 and has pictures of the features, 96 00:05:51,300 --> 00:05:53,460 which are pretty hard to come by, 97 00:05:53,460 --> 00:05:55,590 in electronic format anyway, 98 00:05:55,590 --> 00:05:59,820 because most of the clinical pictures are in books 99 00:05:59,820 --> 00:06:02,310 or are covered by copyrights. 100 00:06:02,310 --> 00:06:05,070 So since this is something that was developed by NIH, 101 00:06:05,070 --> 00:06:08,280 it should not have copyright protection. 102 00:06:08,280 --> 00:06:12,153 So I'm gonna open this up really quick and, 103 00:06:15,420 --> 00:06:16,983 show you what this looks like. 104 00:06:19,080 --> 00:06:20,780 Maybe make it a little bit bigger. 105 00:06:21,870 --> 00:06:25,470 So it's sponsored by 106 00:06:25,470 --> 00:06:27,480 the National Human Genome Research Institute, 107 00:06:27,480 --> 00:06:32,054 part of the NIH, and it has a little description 108 00:06:32,054 --> 00:06:34,890 of how this was developed. 109 00:06:34,890 --> 00:06:38,310 There's a body with little links for the different regions 110 00:06:38,310 --> 00:06:43,310 that each of the areas is categorized into. 111 00:06:43,440 --> 00:06:48,440 There's also a navigation menu over here on the left side, 112 00:06:50,010 --> 00:06:54,210 which is essentially the same list of things. 113 00:06:54,210 --> 00:06:59,210 So let's go to the lips, mouth, and oral region. 114 00:06:59,430 --> 00:07:02,160 And there's a list here. 115 00:07:02,160 --> 00:07:03,390 I'll kind of scroll down 116 00:07:03,390 --> 00:07:06,720 and you can see the different things. 117 00:07:06,720 --> 00:07:08,320 We talked in the lecture about 118 00:07:11,460 --> 00:07:14,880 thin upper lip or vermilion border. 119 00:07:14,880 --> 00:07:17,490 There's also an averted upper lip. 120 00:07:17,490 --> 00:07:19,620 So there's different kinds of things. 121 00:07:19,620 --> 00:07:21,000 And there's the picture over here. 122 00:07:21,000 --> 00:07:24,420 If you wanna get a better picture of it, you can click on it 123 00:07:24,420 --> 00:07:26,430 and it gives you a little bit bigger thing. 124 00:07:26,430 --> 00:07:29,490 So this lip, this upper vermilion border 125 00:07:29,490 --> 00:07:34,490 is a little bit out-turned, in a way, in this individual. 126 00:07:34,830 --> 00:07:38,790 So they have ears and around the eyes, 127 00:07:38,790 --> 00:07:43,790 head and face terminology, hands and feet, and references. 128 00:07:44,670 --> 00:07:47,995 So this is really a pretty nice resource 129 00:07:47,995 --> 00:07:52,995 for looking for pictures for dysmorphology features 130 00:07:58,410 --> 00:08:00,360 and picking out the right terms 131 00:08:00,360 --> 00:08:01,860 that are associated with them. 132 00:08:02,730 --> 00:08:03,563 Okay. 133 00:08:05,550 --> 00:08:08,846 So we're gonna continue on, 134 00:08:08,846 --> 00:08:11,910 and just to give an example here 135 00:08:11,910 --> 00:08:13,743 are prominent fingertip pads. 136 00:08:15,150 --> 00:08:17,430 It gives a definition and descriptive comments 137 00:08:17,430 --> 00:08:21,720 as well as synonyms and old terminology. 138 00:08:21,720 --> 00:08:23,370 And this is a example. 139 00:08:23,370 --> 00:08:28,370 So it's these little areas on the pads of the fingers 140 00:08:28,800 --> 00:08:29,850 where they're sort of, 141 00:08:29,850 --> 00:08:34,410 it's almost as if the skin is tinted up a little bit. 142 00:08:34,410 --> 00:08:36,420 Those are what we used to call prominent, 143 00:08:36,420 --> 00:08:38,520 fetal fingertip pads, and now they're just called 144 00:08:38,520 --> 00:08:40,863 fingertip pads or prominent fingertip pads. 145 00:08:42,840 --> 00:08:44,827 Okay, so here's another resource called the 146 00:08:44,827 --> 00:08:49,500 "Atlas of Malformation Syndromes in Diverse Populations." 147 00:08:49,500 --> 00:08:51,700 So this is actually a fairly recent resource 148 00:08:52,590 --> 00:08:54,630 that was added when we realized 149 00:08:54,630 --> 00:08:58,020 that most of the picture records we have 150 00:08:58,020 --> 00:09:00,160 for teaching about dysmorphology 151 00:09:01,080 --> 00:09:05,370 were in Northern European populations, 152 00:09:05,370 --> 00:09:06,600 and those derived from them. 153 00:09:06,600 --> 00:09:11,580 So we were missing a lot of ethnic variation and so forth. 154 00:09:11,580 --> 00:09:13,590 And a group got together 155 00:09:13,590 --> 00:09:17,220 and started collecting these images. 156 00:09:17,220 --> 00:09:19,290 It's still a process in the works. 157 00:09:19,290 --> 00:09:21,360 Not all features are represented, 158 00:09:21,360 --> 00:09:23,640 not all syndromes are represented, 159 00:09:23,640 --> 00:09:25,869 but there's a lot of information there. 160 00:09:25,869 --> 00:09:29,820 And if you ever have some question about whether 161 00:09:29,820 --> 00:09:33,930 a particular gestalt faces in an ethnic group 162 00:09:33,930 --> 00:09:36,120 that you don't see very often 163 00:09:36,120 --> 00:09:38,813 is related to the ethnic group, you know, 164 00:09:38,813 --> 00:09:41,340 the features associated with that ethnicity 165 00:09:41,340 --> 00:09:45,870 or is actually really a syndrome associated, 166 00:09:45,870 --> 00:09:49,680 gestalt then this is a resource that you can mine for that. 167 00:09:49,680 --> 00:09:54,150 So the disorders are organized by geographic region 168 00:09:54,150 --> 00:09:56,250 or by syndrome name. 169 00:09:56,250 --> 00:10:00,990 And this picture is of a Chinese girl 170 00:10:00,990 --> 00:10:02,970 with Williams syndrome. 171 00:10:02,970 --> 00:10:04,530 So if you know Williams syndrome, 172 00:10:04,530 --> 00:10:07,200 if you look at the Caucasian pictures of William syndrome, 173 00:10:07,200 --> 00:10:10,200 you can begin to sort of compare 174 00:10:10,200 --> 00:10:14,970 the dysmorphic features that are quite similar. 175 00:10:14,970 --> 00:10:17,430 Sometimes they really look similar and sometimes they don't. 176 00:10:17,430 --> 00:10:20,460 So it's an interesting exercise 177 00:10:20,460 --> 00:10:22,560 and I'll just click on that and open it up 178 00:10:23,880 --> 00:10:28,880 and we'll see, again, it's housed at N-H-G-R-I 179 00:10:30,300 --> 00:10:31,530 and you can, over here on the left, 180 00:10:31,530 --> 00:10:34,440 browse by condition or browse by geography. 181 00:10:34,440 --> 00:10:36,330 And I just clicked on geography. 182 00:10:36,330 --> 00:10:41,330 So Asia, Malaysia, Noonan syndrome. 183 00:10:44,730 --> 00:10:48,453 Since we covered that before, I'm gonna have to, 184 00:10:49,620 --> 00:10:53,190 somehow I lost that opening. 185 00:10:53,190 --> 00:10:56,763 So there's a couple of boys with Noonan syndrome, 186 00:10:57,630 --> 00:10:59,163 in Malaysia. 187 00:11:00,060 --> 00:11:03,480 So, and each of those will expand as well. 188 00:11:03,480 --> 00:11:08,480 So that's a really fun, interesting, and useful resource. 189 00:11:09,180 --> 00:11:13,140 Okay, this is one that everybody should know about. 190 00:11:13,140 --> 00:11:17,223 It's basically a catalog of genetic disorders and genes. 191 00:11:18,180 --> 00:11:20,670 That was really the first medical database 192 00:11:20,670 --> 00:11:25,670 to be developed on a computer, back in the 1960s, 193 00:11:26,450 --> 00:11:30,060 and it was started at Johns Hopkins University 194 00:11:30,060 --> 00:11:34,080 as the Online Mendelian Inheritance in Man. 195 00:11:34,080 --> 00:11:36,480 Before it was online, 196 00:11:36,480 --> 00:11:40,800 it was available on little floppy disks. 197 00:11:40,800 --> 00:11:45,593 And it came after the publication of books. 198 00:11:47,280 --> 00:11:50,100 The online version came after the publication of books, 199 00:11:50,100 --> 00:11:53,800 which were essentially printouts of these really original 200 00:11:56,010 --> 00:12:00,060 electronic databases of Mendelian Inheritance in Man. 201 00:12:00,060 --> 00:12:02,823 So that's kind of an interesting historical point. 202 00:12:03,780 --> 00:12:06,300 The pattern of development of this 203 00:12:06,300 --> 00:12:09,030 was basically that experts would read the literature 204 00:12:09,030 --> 00:12:12,370 and they would add a summary of relevant articles 205 00:12:13,560 --> 00:12:17,160 to an entry that they had created with a number 206 00:12:17,160 --> 00:12:20,970 that made it a specific reference-able entity. 207 00:12:20,970 --> 00:12:24,723 So there's an ID number associated with each entry in OMIM. 208 00:12:25,770 --> 00:12:29,490 And over time, it's kept that basic structure, 209 00:12:29,490 --> 00:12:30,720 but it's added a lot more things, 210 00:12:30,720 --> 00:12:34,451 like a lot of links into other databases at NCBI. 211 00:12:34,451 --> 00:12:38,550 And it has some really useful features, 212 00:12:38,550 --> 00:12:41,910 like clinical synopsis, which is basically a feature list, 213 00:12:41,910 --> 00:12:44,640 and something called phenotypic series is 214 00:12:44,640 --> 00:12:48,780 here is a set of disorders which are either, 215 00:12:48,780 --> 00:12:50,730 you know, identical and non distinguishable 216 00:12:50,730 --> 00:12:54,840 or very overlapping, and what are the sets of genes 217 00:12:54,840 --> 00:12:59,640 and that are associated with that phenotypic series. 218 00:12:59,640 --> 00:13:00,720 And then as I mentioned, 219 00:13:00,720 --> 00:13:02,100 the links to the clinical resources. 220 00:13:02,100 --> 00:13:05,703 So just a really quick look here at OMIM. 221 00:13:07,680 --> 00:13:11,820 And it often comes up with this donation request. 222 00:13:11,820 --> 00:13:16,820 That's has to do with funding. 223 00:13:17,820 --> 00:13:20,220 It's traditionally been funded by NIH, 224 00:13:20,220 --> 00:13:25,220 in particular N-H-G-R-I, and there is some friction 225 00:13:25,530 --> 00:13:27,030 about how much funding it should get. 226 00:13:27,030 --> 00:13:28,500 So they're asking for donations. 227 00:13:28,500 --> 00:13:32,670 You do not have to donate to use it. 228 00:13:32,670 --> 00:13:37,670 So you can search for, let's see, 229 00:13:40,200 --> 00:13:43,113 you can search for a syndrome like Williams syndrome. 230 00:13:48,307 --> 00:13:49,770 All right, and you get a list of things 231 00:13:49,770 --> 00:13:52,530 which have that in the name. 232 00:13:52,530 --> 00:13:57,530 You can, as for most databases, put quotes around a phrase 233 00:14:01,140 --> 00:14:03,030 and try to force it into a phrase. 234 00:14:03,030 --> 00:14:05,403 That sometimes works better than other times. 235 00:14:06,360 --> 00:14:09,560 And even at this level, William syndrome 236 00:14:09,560 --> 00:14:12,270 is the same as William-Beuren syndrome. 237 00:14:12,270 --> 00:14:14,700 You can open up this gene phenotype relationships 238 00:14:14,700 --> 00:14:18,330 and see that this is the only disorder 239 00:14:18,330 --> 00:14:23,070 that's associated with this particular gene 240 00:14:23,070 --> 00:14:26,970 and its inheritance. 241 00:14:26,970 --> 00:14:30,420 So you can go direct, this is its ID number, 242 00:14:30,420 --> 00:14:32,220 and you can go direct and read about 243 00:14:32,220 --> 00:14:34,560 the gene phenotype relationship. 244 00:14:34,560 --> 00:14:37,890 There is a button here that'll take you to a new page 245 00:14:37,890 --> 00:14:41,100 that has a clear description of the clinical features, 246 00:14:41,100 --> 00:14:44,940 but you can also use this quick little dropdown button 247 00:14:44,940 --> 00:14:49,503 to scroll through a summary of what those features are. 248 00:14:50,580 --> 00:14:55,580 And these little blue marks are links 249 00:14:58,500 --> 00:15:01,200 that bring you back into that elements of morphology 250 00:15:01,200 --> 00:15:03,150 that we talked about a few minutes ago. 251 00:15:03,990 --> 00:15:06,060 Okay, so there are links there 252 00:15:06,060 --> 00:15:10,740 that will bring you to pictures of the features. 253 00:15:10,740 --> 00:15:11,573 All right? 254 00:15:12,990 --> 00:15:17,990 So one of the things about this disorder, 255 00:15:20,760 --> 00:15:22,140 Williams syndrome is they have 256 00:15:22,140 --> 00:15:24,840 a gregarious, friendly personality, 257 00:15:24,840 --> 00:15:28,260 and there's this sort of classic phrase 258 00:15:28,260 --> 00:15:30,150 is they have a cocktail party personality. 259 00:15:30,150 --> 00:15:32,130 Well, I don't know whether people know anymore 260 00:15:32,130 --> 00:15:34,230 what a cocktail party personality is, 261 00:15:34,230 --> 00:15:38,340 but it's someone who is able to walk up to other people 262 00:15:38,340 --> 00:15:43,340 and chat with them happily, and everybody has a good time. 263 00:15:43,410 --> 00:15:48,150 That sometimes can compensate, 264 00:15:48,150 --> 00:15:52,860 at least in a casual, social situation, for the fact that 265 00:15:52,860 --> 00:15:56,130 there is mental retardation present in the majority, 266 00:15:56,130 --> 00:15:59,340 but not all patients with Williams syndrome. 267 00:15:59,340 --> 00:16:01,230 So that's the way you can do it. 268 00:16:01,230 --> 00:16:05,412 You can also search for, for example, 269 00:16:05,412 --> 00:16:09,780 let's see, I'm trying to think of something fairly specific. 270 00:16:09,780 --> 00:16:11,470 We could search for 271 00:16:13,350 --> 00:16:16,593 Chiari malformation, which is not gonna be very specific, 272 00:16:17,910 --> 00:16:22,680 and we get a list of disorders that are 273 00:16:22,680 --> 00:16:25,470 named Chiari malformation as well as others 274 00:16:25,470 --> 00:16:29,700 that have Chiari as a common feature there. 275 00:16:29,700 --> 00:16:32,274 So one really quick tip about OMIM 276 00:16:32,274 --> 00:16:35,910 is that in the classification scheme, 277 00:16:35,910 --> 00:16:39,990 the disorders are all given an ID number. 278 00:16:39,990 --> 00:16:43,320 When it looks like it may be a real disorder, 279 00:16:43,320 --> 00:16:45,690 but the gene hasn't been identified, 280 00:16:45,690 --> 00:16:48,000 gene or genes hasn't been identified, 281 00:16:48,000 --> 00:16:53,000 or it's maybe polygenic, it gets a percent sign symbol. 282 00:16:53,190 --> 00:16:54,180 Okay? 283 00:16:54,180 --> 00:16:57,120 So here if you go over that, it says phenotype description 284 00:16:57,120 --> 00:16:59,580 or locus molecular basis unknown. 285 00:16:59,580 --> 00:17:01,050 All right? 286 00:17:01,050 --> 00:17:03,240 Once you find the first gene for it, 287 00:17:03,240 --> 00:17:07,380 then it can convert into a pound sign phenotype description, 288 00:17:07,380 --> 00:17:09,420 molecular basis known. 289 00:17:09,420 --> 00:17:10,680 All right? 290 00:17:10,680 --> 00:17:12,750 So those are ways that you can look and see, 291 00:17:12,750 --> 00:17:16,200 well, you know, if there's no molecular basis known, 292 00:17:16,200 --> 00:17:19,260 genetic testing isn't gonna be available for that. 293 00:17:19,260 --> 00:17:21,240 That's a really quick point. 294 00:17:21,240 --> 00:17:24,510 The other point is that you see some of the ID numbers 295 00:17:24,510 --> 00:17:28,170 start with one, and some of them start with two, 296 00:17:28,170 --> 00:17:30,960 and others yet start with three, 297 00:17:30,960 --> 00:17:33,240 and still others start with six. 298 00:17:33,240 --> 00:17:34,710 So what does that mean? 299 00:17:34,710 --> 00:17:37,140 It turns out that in the original classification, 300 00:17:37,140 --> 00:17:39,150 if it started with a one, 301 00:17:39,150 --> 00:17:41,763 it meant that it was an autosomal dominant disorder. 302 00:17:43,011 --> 00:17:43,844 If it started with a two, 303 00:17:43,844 --> 00:17:45,750 it was an autosomal recessive disorder. 304 00:17:46,822 --> 00:17:47,655 If it was started with a three, 305 00:17:47,655 --> 00:17:49,480 it was an X-linked recessive disorder. 306 00:17:50,550 --> 00:17:51,990 And then it became kind of complicated 307 00:17:51,990 --> 00:17:53,850 because we realized that some of the disorders 308 00:17:53,850 --> 00:17:58,530 had multiple modes of inheritance 309 00:17:58,530 --> 00:18:00,543 or that the inheritance wasn't clear. 310 00:18:01,530 --> 00:18:05,310 And we, the OMIM started classifying those 311 00:18:05,310 --> 00:18:08,760 with a first number of six. 312 00:18:08,760 --> 00:18:11,430 And genes were also classified with the first number of six. 313 00:18:11,430 --> 00:18:13,920 So that system kind of broke down, 314 00:18:13,920 --> 00:18:17,670 but for a lot of places in OMIM you can still utilize 315 00:18:17,670 --> 00:18:20,190 the one, two, and three as a dominant, 316 00:18:20,190 --> 00:18:23,470 recessive and X-linked, and that's still quite accurate 317 00:18:24,690 --> 00:18:26,040 as a way of of finding that. 318 00:18:26,040 --> 00:18:27,590 So when you go to one of these, 319 00:18:30,780 --> 00:18:33,630 let's not pick that one, let's pick a different one. 320 00:18:33,630 --> 00:18:35,103 Let's pick Noonan syndrome. 321 00:18:36,060 --> 00:18:38,550 There's the clinical synopsis, and we've talked, 322 00:18:38,550 --> 00:18:40,050 and it'll have those facial features 323 00:18:40,050 --> 00:18:42,660 that we talked about in the dysmorphology lecture, 324 00:18:42,660 --> 00:18:45,150 and then there's also this phenotypic series. 325 00:18:45,150 --> 00:18:46,770 Now this is a really good example 326 00:18:46,770 --> 00:18:50,160 because there are multiple forms of Noonan syndrome 327 00:18:50,160 --> 00:18:54,360 that are due to mutations in different genes. 328 00:18:54,360 --> 00:18:57,930 They all have clinical overlap, strong clinical overlap, 329 00:18:57,930 --> 00:18:59,670 and it turns out if you are a biochemist 330 00:18:59,670 --> 00:19:02,490 and you look at this, you can say, well almost all of these 331 00:19:02,490 --> 00:19:06,243 are in the same biochemical pathway. 332 00:19:07,320 --> 00:19:10,200 So there's KRAS and NRAS, so they're both RASs, 333 00:19:10,200 --> 00:19:14,370 BRAF is downstream of KRAS, as is RAF1. 334 00:19:14,370 --> 00:19:18,660 PTPN11 is an inhibitor of that pathway. 335 00:19:18,660 --> 00:19:23,660 And so there are a bunch of different genes 336 00:19:25,490 --> 00:19:29,430 which can produce more or less the same phenotype. 337 00:19:29,430 --> 00:19:33,600 And this is a context where you might think, okay, 338 00:19:33,600 --> 00:19:36,570 I am not gonna test for them one by one 339 00:19:36,570 --> 00:19:38,010 because I have a gene panel where I can 340 00:19:38,010 --> 00:19:39,720 look at all of these at once 341 00:19:39,720 --> 00:19:44,720 and come down to the answer fairly efficiently. 342 00:19:46,200 --> 00:19:48,050 I will also point out that there are, 343 00:19:49,740 --> 00:19:51,410 the inheritance pattern is listed here 344 00:19:51,410 --> 00:19:54,240 as autosomal dominant for most of them. 345 00:19:54,240 --> 00:19:56,613 This one, NS2 is autosomal recessive. 346 00:19:57,750 --> 00:19:59,040 There's another one that's autosomal dominant, 347 00:19:59,040 --> 00:20:00,630 that's the same gene, right? 348 00:20:00,630 --> 00:20:04,213 So, and that has this six number at the very beginning 349 00:20:04,213 --> 00:20:08,610 of the gene number and the phenotype number. 350 00:20:08,610 --> 00:20:13,610 So there's these situations where it gets kind of complex. 351 00:20:13,920 --> 00:20:15,420 And then there's another one here, 352 00:20:15,420 --> 00:20:18,180 Noonan syndrome two, autosomal recessive, 353 00:20:18,180 --> 00:20:21,570 probably a case report that has not been mapped, 354 00:20:21,570 --> 00:20:24,706 doesn't have, or does have a gene here, 355 00:20:24,706 --> 00:20:28,440 but it says it hasn't been mapped, which is a bit odd. 356 00:20:28,440 --> 00:20:29,370 In any case, 357 00:20:29,370 --> 00:20:32,580 this resource can provide you a lot of information. 358 00:20:32,580 --> 00:20:34,590 We're gonna close that little popup. 359 00:20:34,590 --> 00:20:37,200 And the organization is pretty much the same 360 00:20:37,200 --> 00:20:40,290 as a one line text summary. 361 00:20:40,290 --> 00:20:43,682 There's a description of the disorder. 362 00:20:43,682 --> 00:20:46,560 It talks about the genetic heterogeneity 363 00:20:46,560 --> 00:20:48,000 that we just just mentioned 364 00:20:48,000 --> 00:20:51,460 and has links to a bunch of other forms of the disorder 365 00:20:52,680 --> 00:20:54,900 and talks about some other disorders 366 00:20:54,900 --> 00:20:57,450 that you might also wanna look at. 367 00:20:57,450 --> 00:21:01,800 A sort of a historical article summary, 368 00:21:01,800 --> 00:21:06,800 a literature summary of the patient descriptions. 369 00:21:07,110 --> 00:21:09,540 Now Noonan is known to be really pretty common. 370 00:21:09,540 --> 00:21:12,030 So we're not gonna get every article 371 00:21:12,030 --> 00:21:13,530 ever written about Noonan syndrome, 372 00:21:13,530 --> 00:21:17,010 but basically how that syndrome 373 00:21:17,010 --> 00:21:20,582 was historically developed through time. 374 00:21:20,582 --> 00:21:24,270 Other features that you might see, 375 00:21:24,270 --> 00:21:28,233 giant cell lesions, hematologic abnormalities and leukemia, 376 00:21:29,580 --> 00:21:33,900 and inheritance patterns, population genetics, 377 00:21:33,900 --> 00:21:36,600 how the gene was mapped, 378 00:21:36,600 --> 00:21:39,840 and chromosome studies that may have been done 379 00:21:39,840 --> 00:21:41,730 early on in trying to find out, 380 00:21:41,730 --> 00:21:46,730 before we had molecular methods, and clinical management. 381 00:21:47,100 --> 00:21:49,470 Mostly OMIM doesn't have a lot on clinical management. 382 00:21:49,470 --> 00:21:51,120 I would go to gene reviews for that, 383 00:21:51,120 --> 00:21:53,670 we're gonna talk about that in a moment. 384 00:21:53,670 --> 00:21:56,770 But it does have a great deal of information 385 00:21:57,690 --> 00:22:02,690 about the disorder, and particularly historically, 386 00:22:03,270 --> 00:22:07,230 and has some of the original references. 387 00:22:07,230 --> 00:22:12,230 Some OMIM entries also have a set of mutant allele. 388 00:22:14,460 --> 00:22:19,460 So before ClinVar and other databases were developed 389 00:22:19,770 --> 00:22:23,970 and we started sequencing genes and coming up with variants 390 00:22:23,970 --> 00:22:25,860 that seemed to be pathogenic, 391 00:22:25,860 --> 00:22:28,020 OMIM was the natural place to record those. 392 00:22:28,020 --> 00:22:31,320 So a number of those are recorded in OMIM, 393 00:22:31,320 --> 00:22:33,540 during a particular time span, 394 00:22:33,540 --> 00:22:35,550 and then other databases kind of took that over. 395 00:22:35,550 --> 00:22:37,410 But that's sort of a legacy feature 396 00:22:37,410 --> 00:22:41,943 that you'll see in many OMIM disorder entries. 397 00:22:42,930 --> 00:22:44,520 Over here in the clinical resources, 398 00:22:44,520 --> 00:22:48,000 you can link to gene reviews, 399 00:22:48,000 --> 00:22:50,250 which we're about to talk about Genetics Home Reference, 400 00:22:50,250 --> 00:22:52,260 which you guys know about. 401 00:22:52,260 --> 00:22:54,990 And GTR, which is Genetic Testing Registry, 402 00:22:54,990 --> 00:22:57,870 we'll talk about that in the testing module, 403 00:22:57,870 --> 00:23:01,050 and other kinds of of resources. 404 00:23:01,050 --> 00:23:04,860 So there's just a navigation panel here on the left. 405 00:23:04,860 --> 00:23:09,142 So OMIM was a really old, a venerable workhorse, 406 00:23:09,142 --> 00:23:11,703 that can be very helpful. 407 00:23:12,630 --> 00:23:16,590 All right, so gonna move on to... 408 00:23:16,590 --> 00:23:19,590 And this was just a picture of Van Der Woude syndrome, 409 00:23:19,590 --> 00:23:21,960 which we saw some lip pictures of, 410 00:23:21,960 --> 00:23:23,733 or in the dysmorphology lecture. 411 00:23:24,750 --> 00:23:27,780 But let's move on to GeneReviews.org. 412 00:23:27,780 --> 00:23:30,150 It's part of the NCBI books, 413 00:23:30,150 --> 00:23:32,430 but most easily reached when you're, you know, 414 00:23:32,430 --> 00:23:34,530 in a browser and some random machine 415 00:23:34,530 --> 00:23:39,450 by typing in GeneReviews.org into your browser address bar, 416 00:23:39,450 --> 00:23:44,450 and it will pull up the gene reviews in NCBI Books. 417 00:23:45,210 --> 00:23:48,480 It is authoritative, curated, updated, 418 00:23:48,480 --> 00:23:51,780 and consistently organized, which really takes it way beyond 419 00:23:51,780 --> 00:23:56,780 most other resources in terms of usability and reliability. 420 00:23:56,940 --> 00:24:00,450 It contains diagnostic and management recommendations, 421 00:24:00,450 --> 00:24:02,580 one of the few places where management recommendations 422 00:24:02,580 --> 00:24:04,230 are clearly laid out. 423 00:24:04,230 --> 00:24:06,060 And it includes genetic information 424 00:24:06,060 --> 00:24:08,250 and genetic counseling overview. 425 00:24:08,250 --> 00:24:12,960 So here's an example of the Williams syndrome area 426 00:24:12,960 --> 00:24:14,370 and rather than open it up, 427 00:24:14,370 --> 00:24:18,233 I'm just gonna sort of point out some areas of value. 428 00:24:21,210 --> 00:24:25,290 Here, so this is the search box you wanna search in, 429 00:24:25,290 --> 00:24:26,790 here, not here. 430 00:24:26,790 --> 00:24:30,060 If you search up here, you get everything in NCBI books. 431 00:24:30,060 --> 00:24:30,990 This one will come up, 432 00:24:30,990 --> 00:24:34,563 but it's much more efficient to search in this box here. 433 00:24:35,700 --> 00:24:38,790 It gives you a summary, which it can be 434 00:24:38,790 --> 00:24:40,290 a couple of paragraphs, three, four paragraphs, 435 00:24:40,290 --> 00:24:42,390 and always has clinical characteristics, 436 00:24:42,390 --> 00:24:45,660 diagnosis, management summary, 437 00:24:45,660 --> 00:24:48,270 and genetic counseling down here at the bottom. 438 00:24:48,270 --> 00:24:49,770 After that is really, essentially, 439 00:24:49,770 --> 00:24:52,920 a full book chapter on this disorder. 440 00:24:52,920 --> 00:24:55,110 And you can jump through the book chapter quite easily 441 00:24:55,110 --> 00:24:59,220 by using this navigation thing over here on the right. 442 00:24:59,220 --> 00:25:03,540 So I'll often go to diagnosis or clinical characteristics, 443 00:25:03,540 --> 00:25:05,100 or differential diagnosis, so I'll say, 444 00:25:05,100 --> 00:25:06,420 it looks kind of like Williams syndrome, 445 00:25:06,420 --> 00:25:08,040 but I don't think it is. 446 00:25:08,040 --> 00:25:09,900 So let me see what other people think 447 00:25:09,900 --> 00:25:11,190 overlaps with Williams syndrome. 448 00:25:11,190 --> 00:25:13,320 What are things that look like it that you need to consider? 449 00:25:13,320 --> 00:25:15,450 And you can just click on that link 450 00:25:15,450 --> 00:25:17,970 and move down in the article to that segment. 451 00:25:17,970 --> 00:25:19,860 The other area I use a lot is the management. 452 00:25:19,860 --> 00:25:21,330 What are the management recommendations 453 00:25:21,330 --> 00:25:23,400 for when a new diagnosis is made? 454 00:25:23,400 --> 00:25:25,350 What are the management recommendations 455 00:25:27,330 --> 00:25:30,600 for annual surveillance or periodic surveillance 456 00:25:30,600 --> 00:25:33,600 for issues that may come up in this disorder. 457 00:25:33,600 --> 00:25:35,910 Molecular genetics may help you understand 458 00:25:35,910 --> 00:25:38,880 the types of testing that may be helpful 459 00:25:38,880 --> 00:25:40,713 for confirming the diagnosis. 460 00:25:41,593 --> 00:25:44,730 And then the genetic counseling section 461 00:25:44,730 --> 00:25:49,230 will tell more in detail about the mode of inheritance, 462 00:25:49,230 --> 00:25:51,420 the genetic counseling issues, 463 00:25:51,420 --> 00:25:56,070 and have resources for that as well. 464 00:25:56,070 --> 00:25:58,710 There is a resource section here, 465 00:25:58,710 --> 00:26:02,400 which is sort of organizations 466 00:26:02,400 --> 00:26:04,680 that focus on that particular disorder 467 00:26:04,680 --> 00:26:07,830 that you may wanna refer your patient's family to 468 00:26:07,830 --> 00:26:10,560 for more support and more information. 469 00:26:10,560 --> 00:26:12,843 So those are all really, really good. 470 00:26:13,770 --> 00:26:16,148 There are links here 471 00:26:16,148 --> 00:26:21,148 which links out to other kinds of things. 472 00:26:22,350 --> 00:26:27,350 It links to the specific tests in genetic testing resource, 473 00:26:27,420 --> 00:26:29,073 which we'll also cover later. 474 00:26:30,030 --> 00:26:33,810 And tests in genetic testing, resource by condition. 475 00:26:33,810 --> 00:26:35,747 And then other related information, OMIM, 476 00:26:35,747 --> 00:26:38,520 PubMed Central, and places like that. 477 00:26:38,520 --> 00:26:42,570 So it's really a very, 478 00:26:42,570 --> 00:26:45,990 it's like having a free book that's updated all the time, 479 00:26:45,990 --> 00:26:50,580 or every year or so, at your fingertips in the clinic. 480 00:26:50,580 --> 00:26:51,780 Quite wonderful. 481 00:26:51,780 --> 00:26:54,690 All right, so I'm gonna quit there 482 00:26:54,690 --> 00:26:57,997 and move off of this lecture topic. 483 00:27:03,360 --> 00:27:06,120 I appreciate your listening and learning 484 00:27:06,120 --> 00:27:10,413 and I think that's the end of my lecture.