Original #SyngapCensus Article

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#SyngapCensus: We know of at least 431 SynGap patients, here’s where they are

Mike Graglia is the co-founder of SRF, his son Tony has SynGAP. Both of them like to count things.


As a SynGAP parent you have one conversation very often. It goes like this…

“He has SynGAP.”

“What’s that?”

“He has a spontaneous mutation in his DNA, as a result he has half of a critical neurological protein, as a result he has epilepsy, behaviors, low tone, global delays, sleep issues and intellectual disability.”

Awkward silence/niceties followed by “can’t the doctors do anything?”

“Not really, they don’t know enough and there are very few patients. The research will take time and there aren’t enough organizations like SRF funding research.”

“How many patients are there?”

Awkward silence followed by “some say 200–300, other say up to 400, nobody actually seems to know, but there is a new family on the Global Family Support list every week! Let’s say 350…”

“Shouldn’t you know that; how many kids have your kid’s disease?”

“Yes, yes we should.”

I am tired of this conversation. I don’t understand why we don’t have a better answer. So I’ve put one together. This number is wrong, it’s too low, but it’s a start.


This list of countries and numbers has been shared with us by the leader of the specific countries’ patient group or by other parents; we are connected to these groups through the SynGAP Global Network of which SRF is the US node. Backup also exists in the form of lists kept by people who have been patient leaders in this space for years. We are lucky to have these parents on the SRF leadership team. Finally, many of us are on closed lists to share experiences — of which Global Family Support is the most respectful and welcoming — and we can identify patient family geography that way.


If you look at a geography, be it a country or a US state, and you think our number is low, please let us know. We are happy to update this article as often as needed. We are sharing this list because it’s a number we should know and we can make more accurate together. Every patient deserves to know about the community they belong to.


As you look at this list, you may be surprised to see that a country with a population of 66 million, the UK, has the second most SynGAPians: 77. The story here is worth knowing as we think about how many kids around the world may have SynGAP and be undiagnosed. In the UK, via the DDD, they took 12,000 kids with developmental disorders and sequenced them to see what they could learn. This surfaced most of the diagnoses in the UK. Let’s assume they got every case in the country (definitely wrong and low) then that is 1.1 SynGAP patient per million population (or ~7,700 cases globally— meaning we know of ~5% of the SynGAP population). You can do the math below but it suggests that ever number below is too low by a factor of 1.5 (France) to 1,200 (India); not to mention the countries we don’t even list here like China or Indonesia.

Original global data when this article was first published. Counts by country summing to 364, our best guess as of July 15, 2019
Original global data when this article was first published. Counts by country summing to 364, our best guess as of July 15, 2019

Country Count (Total = 431)
🇺🇸 USA 112 via SRF
🇬🇧 United Kingdom 78
🇫🇷 France 39 via Overcome Syngap1
🇩🇪 Germany 35 via Syngap Elternhilfe
🇳🇱 Netherlands 27
🇨🇦 Canada 18 via Overcome Syngap1
🇦🇺 Australia 18 via Syngap Research Australia
🇪🇸 Spain 15 via Syngap1 Spain
🇮🇹 Italy 12 via Syngap1 Italia
🇧🇷 Brazil 7
🇮🇪 Ireland 7
🇳🇴 Norway 7
🇸🇪 Sweden 7 via Syngap1 Sweden
🇧🇪 Belgium 5
🇨🇳 China 5 via paper + 1 organic
🇨🇭 Switzerland 5
🇰🇷 Korea 4 via paper
🇫🇮 Finland 3
🇦🇹 Austria 2 via Leon & Friends
🇮🇱 Israel 2
🇯🇵 Japan 2 via paper & organic
🇵🇱 Poland 2
🇵🇹 Portugal 2
🇷🇸 Serbia 2
🇸🇷 Suriname 2
🇩🇿 Algeria 1
🇧🇾 Belarus 1
🇨🇴 Colombia 1
🇭🇷 Croatia 1
🇨🇿 Czech Republic 1
🇩🇰 Denmark 1 via paper
🇪🇬 Egypt 1
🇪🇪 Estonia 1
🇮🇳 India 1 via Syngap1 India
🇷🇴 Romania 1
🇷🇺 Russia 1 via paper
🇸🇰 Slovakia 1
🇹🇹 Trinidad 1
🇿🇦 South Africa 0 moved back to USA

US Detail (Total = 112)
California 20
Texas 16
Georgia 6
Minnesota 6
Massachusetts 5
Ohio 5
Alabama 4
Indiana 4
New York 4
Pennsylvania 4
Virginia 4
Florida 3
Michigan 3
North Carolina 3
Arizona 2
Kentucky 2
Maryland 2
New Jersey 2
Oregon 2
Washington 2
Colorado 1
Connecticut 1
Hawaii 1
Illinois 1
Iowa 1
Kansas 1
Mississippi 1
Montana 1
North Dakota 1
Rhode Island 1
Tennessee 1
Wisconsin 1
Wyoming 1

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To share this story use: bit.ly/SRF_4PbyP_Census_Original

Note: Since publication we have received the updates for 67 more patients! Please keep them coming! The data above reflects these updates.