Investigating sensory processing in children with rare genetic syndromes

How we process the world around us through our senses is essential to almost everything we do. When eating a meal our eyes and nose tell us what we are about to eat, our mouths inform us about the taste and texture of the food, our touch receptors and feedback from our limbs allow us to hold and use the knife and fork, and our ears detect the voices around the table. Our different sensory systems are continuously filtering the important information from the non-important information, allowing us to respond accordingly. Most of the time our brains and bodies are processing all of this information without us even noticing.

 

The eight sensory modalities

Children with sensory processing differences experience the world differently to others     . Sometimes, these differences mean children face challenges in their participation in everyday activities or in certain environments. Some children require more sensory input to detect a sensory experience (e.g., they may seem unaware of temperature changes) or they may seek out sensory input to meet their sensory needs (e.g., they may display a need to touch objects, surfaces or textures). Children may have increased sensitivity to sensory input (e.g,. they struggle to focus on a task in background noise) or they may become easily overwhelmed or avoid certain sensory experiences altogether (e.g., they refuse to go to the park because it’s noisy). Sensory processing differences can be highly individual and varied and different responses to sensory input can occur across different sensory modalities (e.g., a child may be over-sensitive to touch but under-sensitive to sound). Sensory difficulties can have a profound effect on daily life and have been associated with decreased activity, decreased school and social participation, increased anxiety, challenging behaviours, and poorer cognitive outcomes. Certain strategies can be used to support children’s participation by removing disruptive sensory input, helping children get the sensory input they are seeking, or by helping children build tolerance towards certain types of sensory input.

Previous research has shown children with rare genetic syndromes; Sotos syndrome, Tatton-Brown Rahman Syndrome, 16p11.2 deletion syndrome, and 16p11.2 duplication syndrome, commonly display autistic traits which may increase the likelihood of sensory processing differences. Compared to more common conditions, there is very limited research on the experiences of children with these syndromes. A better understanding of children’s experiences and potential difficulties is needed to provide information and support for children with rare genetic syndromes and their families. To date, no research has investigated the presence or type of sensory differences in any of these syndromes.

Our new research study, the Sensory Profiles in Rare Genetic Syndromes study will investigate the sensory processing of children aged 3-14 years old with Sotos syndrome, Tatton-Brown Rahman Syndrome, 16p11.2 deletion syndrome, and 16p11.2 duplication syndrome. The study will use a specially-developed questionnaire (completed by a parent or caregiver) to measure children’s sensory processing across the different sensory modalities (i.e. their “Sensory Profile”). The study will also include questionnaires to assess other aspects of behaviour that may be linked to sensory processing differences.

We hope that this research will provide important information that will support families of children with rare genetic syndromes and professionals who work with children with rare genetic syndromes. Understanding particular sensory differences can inform tailored strategies or treatment approaches to support children and families.

Parents or caregivers of children aged 8 to 14 years old with Sotos syndrome, Tatton-Brown Rahman Syndrome, 16p11.2 deletion syndrome, or 16p11.2 duplication syndrome can take part in the study from home. The questionnaires can be completed online or by post and the study is open to participants worldwide. Parents and caregivers will receive a summary of their child’s sensory profile after they take part. If you would like to find out more about the study or if you would like to sign up to take part, complete our contact form or email harriet.smith@sheffield.ac.uk.

You can find articles on ShARL’s previous work on these rare genetic syndromes below. Please email us at sharl@sheffield.ac.uk if you would like copies:

1. Lane, C., Tatton-Brown, K., & Freeth, M. (2020) Tatton-Brown-Rahman syndrome : cognitive and behavioural phenotypes. Developmental Medicine & Child Neurology, 62(8), 993-998
2. Al-Jawahiri, R., Jones, M., & Milne, E. (2020). Spontaneous neural activity relates to psychiatric traits in 16p11. 2 CNV carriers: An analysis of EEG spectral power and multiscale entropy. Journal of Psychiatric Research.
3. Al-Jawahiri, R., Jones, M., & Milne, E. (2019). Atypical neural variability in carriers of 16p11.2 copy number variants Autism Research, 12(9), 1322-1333.
4. Lane, C., van Herwegen, J., & Freeth, M. (2019).      Exploring the approximate number system in Sotos syndrome: Insights from a dot comparison task Journal of Intellectual Disability Research, 63(8), 917-925
5. Lane, C., van Herwegen, J., & Freeth, M. (2019).      Parent-reported communication abilities of children with Sotos syndrome: Evidence from the Children's Communication Checklist-2. Journal of Autism and Developmental Disorders, 49(4), 1475-1483
6. Lane, C., Milne, E., & Freeth, M. (2019).      The Cognitive Profile of Sotos Syndrome. Journal of Neuropsychology, 13(2), 240-252    

7. Lane, C., Milne, E., & Freeth, M. (2017).      Characteristics of Autism Spectrum Disorder in Sotos Syndrome. Journal of Autism and Developmental Disorders, 47(1), 135-143.

 

 

Genetic syndromes research at ShARL

For Rare Diseases Day 2021 we are publishing a series of blogs about the research on rare genetic syndromes that we do at ShARL. We started our research on rare genetic syndromes in 2014. At this time we realised that although there is a lot of medical and genetic research that improves understanding of rare genetic syndromes, there is far less that aims to improve knowledge and understanding of the impact of syndromes on cognition (how we think and learn) and behaviour. It is really important for families that this type of work is done so that when a diagnosis of a particular syndrome is received, they can be equiped with knowledge about what to expect in terms of development and learn about what educational and environmental support may help children to have optimal life chances and optimal outcomes.

At ShARL we are really passionate about doing work that will help families and we are always keen to hear from families about the types of research they would like to see done. We realise that families often have many unanswered questions and that it can be frustrating when even the specialists don't have clear answers for them, so this is something that we're trying to contribute to improving. To date, we have projects that focus on Sotos syndrome, Tatton-Brown Rahman syndrome, Weaver syndrome, Silver-Russell syndrome, 16p11.2 duplication syndrome, 16p11.2 deletion syndrome, 22q11 deletion syndrome. The projects that we're able to run depend on being able to acquire funding to do so but we're always looking for funding opportunities and organisations to work with to enable projects to run.

In this first blog in our series for Rare Diseases Day 2021 we don't have space to write about all of our work so, instead, I've decided to focus on the syndrome we've published most work on so far. Hopefully this brief overview provides some insight into the types of questions we can answer from our lab doing this type of research. In future we hope to both improve understanding further on the syndromes we have already been working on and to also do research on other syndromes for which there is little current knowledge.

Our research on Sotos syndrome

We began our rare genetic syndromes work on a condition called Sotos syndrome. Much of this work has been funded by the Child Growth Foundation and we
have also recieved support from the Baily Thomas Chaitable Fund. This work was led by Dr Chloe Lane. 

Sotos syndrome is an overgrowth disorder which is present from birth. Individuals with Sotos syndrome tend to have an enlarged head circumferance, characteristic facial features and some degree of intellectual disability. It is caused by haploinsufficiency of the NSD1 gene on chromosome 5. It affects males and females equally and in the majority of cases the NSD1 abnormalities that cause Sotos syndrome are "de novo" meaning that they occur spontaneously and the condition is not inherited.

One of our research projects on Sotos syndrome investigated whether there is a specific learning profile associated with the syndrome, i.e. whether there is a consistent profile of relative strengths and difficulties. We found that while those with Sotos syndrome tend to be of overall lower ability than children of the same age, they tend to have relative strengths with verbal skills (both speaking and understanding) but relative difficulty with non-verbal reasoning skills. They tend to have strengths in visuo-spatial memory, so things like remembering routes traveled and where to find things can be a strength. In a piece of research that specifically focused on the different aspects of language we found that while understanding of sentences and vocabulary tends to be quite good, sometimes this may not be apparent during conversations as the social aspects of language, such as turn-taking, using non-verbal cues such as eye-gaze direction or using language in appropriate contexts can be a challenge. Some of these difficulties are also experienced by individuals on the autistic spectrum. So, in another piece of research we investigated how common it is for individuals with Sotos syndrome to display autistic traits. We found that it is really common for those with Sotos syndrome to display autistic traits, with most expressing traits at the "clinically relevant" level. An area of life that individuals with Sotos syndrome find particularly challenging is managing finance and dealing with numbers in general. So, in another piece of research we decided to investigate whether there were any underlying reasons why this might be. We found that those with Sotos syndrome tend to have good estimation skills (termed the "approximate number system") but they have difficulties with impulse control and this may be impairing their maths skills development. In future, it will be important to investigate how this aspect of development can be best supported in order to help children with Sotos syndrome acquire these important numerical skills.

Although quite a brief whistle-stop tour, I hope this overview provides some insight into the sorts of projects we do at ShARL. We will share outcomes of our future projects as they progress and there will be more information about these projects as part of this blog series. If you would like access to any of the research written about in this blog, please email me (m.freeth@sheffield.ac.uk) and I'll be happy to share it directly. Further information on all of the work that we do at ShARL is available on our website.

Thank you for reading!

Dr Megan Freeth

Senior Lecturer in Psychology

Director of the Sheffield Autism Research Lab