Advancing knowledge, together.
Dias-Logan syndrome (BCL11A-IDD) remains poorly documented.
Faced with a lack of structured data, we initiated an approach aimed at better understanding the realities experienced by patients and their families, on an international scale.
Each contribution helps to bring to light observations that are useful for a better understanding of the syndrome.
Where are we now?
Today, our approach has brought together an international community of families affected by Dias-Logan syndrome (BCL11A-IDD).
More than 60 families have already contributed, allowing the first observations on the syndrome and its variability to emerge.
This work is currently being structured. It is evolving gradually, with the aim of offering a rigorous, respectful and useful long-term approach.
Initial observations
The initial contributions are already revealing certain trends observed in the experiences of patients and their families.
These elements are derived from voluntary declarations and do not constitute, at this stage, a clinical study.
An independent analysis based on data currently collected from 69 patients, conducted by Virginie and Alexis.
The elements presented here constitute part of the work in progress.
These elements provide an overview of the most frequently reported manifestations, while also reflecting the diversity of situations
These initial observations highlight a range of frequent manifestations, including attention deficits, motor difficulties, anxiety, and behavioral problems.
Hypotonia, speech disorders, and characteristics suggestive of autism spectrum disorders are also regularly reported by families.
This graph highlights the areas that remain the most difficult in the daily lives of patients, despite the time and support put in place.
The difficulties that persist mainly concern attention and concentration, communication, and behavior.
Autonomy and sensory aspects also appear as areas frequently impacted in daily life
The available data can be used to illustrate the distribution of levels of intellectual disability when it is known.
The available data show a wide variability in profiles, with a majority of situations falling into moderate forms.
These results should be interpreted with caution, as some situations are still being evaluated or are not reported.
Despite the difficulties observed, many areas also show progress over time.
These results highlight the potential for improvement in patients, particularly in communication and motor skills.
They emphasize the importance of early and appropriate support.
The data collected also makes it possible to identify the support measures most frequently put in place.
The support provided is varied and often combined, with a central role for speech therapy, educational support and motor therapies.
A multidisciplinary approach appears essential.
Overall reading of the data
An analysis based on data currently collected from 69 patients, carried out by Virginie and Alexis, offering concrete insight into the reality of Dias-Logan syndrome on a daily basis.
These elements are part of a broader approach that is currently being structured.
The data collected from families helps to better understand the reality of Dias-Logan syndrome on a daily basis.
They highlight an overall neurodevelopmental profile, in which several areas are affected simultaneously, with a predominance of difficulties with attention, communication and behavior.
Hypotonia and fatigue also appear as frequently reported elements, having a significant impact on the daily lives of patients, particularly on endurance, motor skills and attention span.
These difficulties appear to be central:
They are both very frequently observed and those that persist the most over time.
However, these results also show an essential dynamic: evolution is possible.
Progress has been reported, particularly in:
Communication
Motor skills
Autonomy
These improvements highlight the key role:
Time
Learning experiences
And appropriate support
The support measures put in place directly reflect the identified needs.
Speech therapy, occupational therapy, psychomotor therapy and educational support play a central role in the patients' journey.
These support measures are all the more essential in the face of factors such as hypotonia and fatigue, which can limit learning abilities and require specific adaptations.
Today, they constitute essential levers to support development and promote progress.
This data also highlights the diversity of situations.
The level of intellectual disability, communication methods, autonomy, and life paths vary from one patient to another.
There is not a single profile, but significant variability, which requires an individualized approach.
Finally, these results should be interpreted with caution.
They are based on self-reported data, including:
Patients who are still young
Evaluations sometimes in progress
And evolving career paths
In conclusion
This data does not define the patients.
They allow us to understand them better.
They offer a comprehensive view of the syndrome, highlighting the challenges...
but also the capacity for evolution.
They also point out that certain factors, such as hypotonia and fatigue, strongly influence daily life and require special attention in support.
Each journey is unique.
Scientific publications
This page brings together a selection of scientific publications related to Dias-Logan syndrome / BCL11A-IDD.
Our goal is to make this work more accessible to families, by providing a clear summary and a link to the original source for each publication.
Study Angela Peron, Cristina Dias
et al
1993-2019
Summary:
BCL11A-IDD-related intellectual disability results in developmental delay, hypotonia, microcephaly, and behavioral problems, sometimes associated with autism or epilepsy.
The diagnosis is based on the identification of a BCL11A genetic mutation in a patient presenting suggestive clinical signs.
Treatment is primarily symptomatic, with regular monitoring and appropriate support, and the disease is most often due to a de novo mutation.
Link to the article:
https://pubmed.ncbi.nlm.nih.gov/31556984/
Study Angela Peron, Cristina Dias
et al.
2019
Summary:
BCL11A-related intellectual disability manifests as developmental delay, hypotonia, microcephaly, behavioral disorders, and persistence of fetal hemoglobin.
The diagnosis is based on a genetic test identifying a mutation in the gene, often appearing de novo.
Management is symptomatic with regular follow-up, and the prognosis is generally compatible with life into adulthood.
Link to the article:
https://www.ncbi.nlm.nih.gov/books/NBK547048/
Cristina Dias Study
et al. Am J Hum Genet
2016
Summary:
Intellectual disability can be caused by mutations in the BCL11A gene, which is involved in brain development.
These mutations disrupt the normal function of the protein and lead to cognitive and social impairments, as well as microcephaly.
Studies in mice confirm these effects and show abnormalities in the expression of brain genes.
Link to the article:
https://pubmed.ncbi.nlm.nih.gov/27453576/
Study by Angela Peron et al.
Eur J Hum Genet
2025
Summary:
BCL11A-related intellectual developmental disorder has common features such as intellectual disability, microcephaly, hypotonia, and behavioral disorders including autism.
The study of 77 patients identifies numerous types of mutations and highlights a new symptom:
an autonomous dysregulation.
It also shows that certain mutations are associated with more severe forms and highlights the key role of BCL11A in brain development, useful for diagnosis and monitoring.
Link to the article:
https://pubmed.ncbi.nlm.nih.gov/39448799/
Database:
Orphanet (European database dedicated to rare diseases)
Orpha code: 619233
https://www.orpha.net/fr/disease/detail/619233#
OMIM (American database focused on human genes and genetic diseases)
OMIM Code: 617101
Simons Searchlight
https://www.simonssearchlight.org/research/what-we-study/bcl11a/
Scientific Committee
The formation of a scientific committee is currently underway.
Several exchanges have been initiated in order to bring together, around the Dias-Logan / BCL11A-IDD syndrome, health professionals, researchers and specialists involved in understanding the syndrome, supporting families and developing knowledge.
The official composition of the scientific committee will be presented on this page as soon as the participations are formally validated.
The researchers behind the syndrome
Darren Logan
Biography
Darren Logan obtained a Master's degree in biochemistry from the University of Bath, before pursuing a PhD at the MRC Human Genetics Unit in Edinburgh.
He then joined the Scripps Research Institute in San Diego for his postdoctoral research, where he received a Skaggs fellowship to study the genetic basis of behavior.
In early 2010, he joined the Wellcome Sanger Institute in Cambridge as a member of the model organisms program. His team there studied the genes that allow mammals to detect, interpret, and respond appropriately to stimuli in their environment. During this period, his team worked on candidate genes involved in intellectual disabilities, including TRAPPC9, KPTN, and BCL11A—work that led to the description of a disorder now known as Dias-Logan syndrome.