JaneMare
Developmental Dyslexia is not a condition it is rather a spectrum of cognitive subtypes or underlying conditions, and these underlying conditions can also contribute to the ASD spectrum, the multiple issues that combine to trigger the autistic behaviour traits. And the real problem in he UK is a lack of qualified professionals able to provide a diagnosis of these cognitive issues who work as part of flexible multi - discipline teams able to assess and diagnose each potential child's potential range of issues.
Developmental dyslexia has three cognitive subtypes, auditory, visual, and attentional, which means that an auditory processing disorder, a visual processing disorder, an attention disorder, or any combination of the three can cause the dyslexic symptom. These clinically diagnose medical issues have more symptoms that just the dyslexic one. Each one have a different range of issues.
ASD is diagnosed based on groups of specified observed behaviour traits, and it has only been in more recent times that research has begun to unpick the multiple issues which can cause ASD. Links have been made to ADHD, and links to auditory issues causing the language and communication problems.
Unfortunately there are no clinical or medical diagnostic test for either Dyslexia or ASD. And in the case of dyslexia never likely to be as it is only a shared symptom of other disabilities. ASD is the subject to continued debate and discussion amongst international researchers, who are talking about future Autisms as the learn more of the possible diagnostic variations.
All who have a diagnosis of dyslexia really do need to identify the underlying cause or causes of their dyslexic symptom as these issues tends to have more serious symptoms than the dyslexic one.
You could have a look at the CiteULike Developmental Dyslexia research paper library and the CiteULike Autism research paper library both have genetic origins hence the questions about a possible family history, regarding these issues