Biological Factors

From: Subject: Biological Factors Date: Fri, 10 Apr 2009 15:41:02 -0400 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0000_01C9B9F2.C0DAAAB0" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01C9B9F2.C0DAAAB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Location: http://library.thinkquest.org/C0110296/print.php?id=40&refpage=/C0110296/info.php Biological Factors

Explaining=20 autism:
Biological Factors

The = following are=20 some possible biological causes for autism, although research has = yet to=20 confirm them.

1. genetic factors

-- about 2 or 3 per cent of brothers and sisters also develop = autism;=20 meanwhile about 10-15% of siblings do not develop autism but have = other=20 difficulties (language, mental, reading, etc.) These are = relatively high=20 rates, suggesting a possible genetic link.

Examples: fragile X syndrome, phenylketonuria, tuberous = sclerosis,=20 neurofibromatosis, other chromosomal abnormalities

3D"characteristics 2. = pregnancy/ birth=20 complications

-- certain complications during pregnancy may possibly cause = brain=20 damage to the infant (at present, it is unclear whether these = cause=20 autism, play a part along with other factors, or are simply = indicative=20 symptoms of abnormalities already present)

Examples: bleeding between the fourth and eight month of = pregnancy, a=20 'rhesus incompatibility' between the mother's and child's blood = groups,=20 meconium (first stools of the infant) present in the amniotic = fluid during=20 labour, mother being above 35 years old at time of child's birth = (higher=20 risk), birth order (first or fourth or later-born children may = carry a=20 slightly higher risk), medication during pregnancy

3. viral infections

-- some viral infections during pregnancy have been reported in = association with autism (like pregnancy complications, it is = unclear if=20 these are actually causal of autism)

Examples: congenital rubella, congenital cytomegalovirus, = herpes=20 encephalitis

4. metabolic disorders

Examples: abnormalities in purine synthesis, abonormalities in=20 carbohydrate metabolism

5. congenital anomaly = syndromes

-- sometimes in children with autism, there are identifiable = physical=20 abnormalities at birth, known as congenital anomaly = syndromes (eg.=20 an unusually large head, an abnormal formation of ears, etc.)

Examples: Cornelia de Lange syndrome, Noonan syndrome, Coffin = Siris=20 syndrome, William's syndrome, Biedl-Bardet syndrome, Moebius' = syndrome,=20 Leber's amaurosis

continue= d=20 >>

Last modified: 2001-09-07
This document can be found=20 at:
http://library.thinkquest.org/C0110296/info.php?id=3D40 =

=A9 2001=20 THINKQUEST TEAM C0110296 | PLEASE READ THE DISCLAI= MER=20

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