Autistic Spectrum Disorder – Nature or Nurture? Aware or beware?


Since April was ‘Autism awareness month’ internationally, this blog is a little different, aiming to raise awareness of autism and how adults with autism and its associated disorders might differ from the neurotypical.

In March 2014, the US government released figures estimating the prevalence of autism as being 1 in 68 boys and 1 in 189 girls (thus creating a ratio of male:female prevalence of almost 3:1)1. This means that in most communities and workplaces, there will be at least one member who has been diagnosed as being ‘on the spectrum’, due to the expression of a ‘complex behavioural phenotype’, which now includes atypical disorders such as Asperger’s Syndrome or High Functioning Autism (those with an IQ higher than 80 and with good verbal skills).

The Nature-nurture debate

It is now commonly accepted that autistic traits run in families. It has even been argued that such traits are cumulative, resulting in children that are more autistic than their parents1. Recent studies have centred on mutations contained within nonsense DNA, that is to say, DNA which does not code for protein-coding genes, per se, but rather molecular modulators of gene expression. Such modulators include ‘enhancers’, of which more than 100 are now known to be present more in the brain than other tissues of the body, resulting in a significant influence over brain development in utero. Traditional gene studies, which focussed upon protein-coding genes, would actually miss more than 95 % of the human genome, therefore it’s of little wonder that our understanding of developmental pathways in neurological disorders lags behind that of more physically symptomatic diseases such as heart disease, or cancer. This is partly due to the phenomenon of ‘environmental fixation’, whereby families (particularly mothers) were blamed for their child’s autistic traits, to the extent of being branded ‘refrigerator mothers’, alluding to the alleged coldness with which they raised their children2. Furthermore, Harlow (1972) described behaviours in his rhesus monkeys, deprived of maternal contact, that were concordant with those of the autistic children carefully described by Kanner3, perpetuating the theory that families were to blame for the atypical behaviour of their child.  Thus, the pendulum of scientific opinion has swung between the two extremes of ‘nature’ versus ‘nurture’. Current models propose that multiple genetic, epigenetic and environmental factors may contribute to the etiology of autism, with the last decade of research revealing a significant genetic heterogeneity4. In summary, no two individuals diagnosed with ASD or Asperger Syndrome are the same!

The vast majority of studies into autism focus on children, as do the strategies designed to enable those diagnosed on the spectrum to cope with ‘day-to-day life’. However, children become adults, raising the challenge of both adaptation to an environment designed for neurotypical adults and also diagnosis for those adults who form the ‘lost generation’, people who were previously excluded from a diagnosis of classic autism either through ‘camouflage strategies’ (particularly prevalent in girls who are more likely to copy peers and thus appear ‘neurotypical’ to the untrained eye) or adaptation strategies, whereby an individual copies the actions of a neurotypical colleague, learning social rules as one might study a recipe, or protocol. A school friend of mine was such a case. She wore the same clothes as her best friend, did the same hobbies and was academically outstanding. Yet she failed to progress in her chosen career and was diagnosed with Asperger’s Syndrome aged 41. Her career choice of course was influenced by that of her peers, rather than her strengths.

So are HFAs and Aspies always doomed to failure in the workplace? Much is made of the drawbacks of HFA/Asperger’s Syndrome – appearing dissociated or uninterested, difficulties with social interaction, inappropriate conversation and lack of eye contact leading to perceptions of not telling the truth or being disinterested in a particular task or employment role to mention but a few – but shouldn’t we focus more on what autism has to offer?

For example, they may have the ability to focus intensely and for long periods on a difficult problem. There is often an enhanced learning ability, although this often is not applied to subjects they are uninterested in – and therefore it may be necessary to play to the strengths of employees or students, rather than attempting to counter-act weaknesses. HFAs and Aspies often present no problems in a supportive, well-resourced educational institution and often do well academically if they can be stimulated by good teachers. People with HFA and Asperger’s often have intense and deep knowledge of an obscure or difficult subject and a passion for pursuing it in an organized and scholarly manner. This makes them more likely to excel in ‘niche’ topics, particularly neglected areas of research. They are usually intelligent, gifted, honest, hard workers when interested in a task and excellent problem solvers. People with high-functioning autism are thought to become excellent scientists and engineers or enter other professions where painstaking, methodical analysis is required.

So should we beware of Autism? Or accept what it has to offer? Besides, what exactly is normal?

Blog written by Diane Lee, who has recently moved to the School of Veterinary Medicine at the Universityof Surrey.

1 Sylvie Goldman, MD, Albert Einstein College of Medicine, Opinion: Sex, Gender and the Diagnosis of Autism – A Biosocial View of the Male Preponderance (p.1-2) http://www.sciencedirect.com/science/article/pii/S1750946713000317

2Judith Miles: Autism spectrum disorders—A genetics review; Genetics in Medicine (2011) 13, 278–294; doi:10.1097/GIM.0b013e3181ff67ba

3Kanner L. (1949). Problems of nosology and psychodynamics of early infantile autism. Am. J. Orthopsychiatry 19, 416–426

4Geschwind D. H. (2008). Autism: many genes, common pathways? Cell 135, 391–39510.1016/j.cell.2008.10.016

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