Upload
peninsulaendocrine
View
894
Download
0
Tags:
Embed Size (px)
Citation preview
Alström syndromeClinical studies and research
R B Paisey on behalf of:National clinical advisory Group
Alström syndrome UKCardiology,endocrinology,vascular medicine, biochemistry, radiology,
dietetics, respiratory medicine, urology,audiology, orthopaedics and
rheumatology.
National Clinical Advisory Team
Major organ transplantationRare disease diagnosis and treatment
“ EU Rules” Alström UK
Alström Syndrome
• Carl Henry Alström 1959• Deaf blind syndrome• Preserved intelligence• Obesity• Insulin resistance• Type 2 diabetes• ? 30 in world-now 600+
Alström friends
ASCO
Autosomal Recessive Inheritance
Two germline mutations (one from each parent) to develop disease
Equally transmitted by men and women
Noncarrier individual
Non-affected carrier
Affected individual
Alström syndrome human chromosomes
Alström syndrome chromosome 2
Alström syndrome location of the gene
The ALMS1 gene is located on the short (p) arm of chromosome 2 at position 13.More precisely, the ALMS1 gene is located from base pair 73,612,885 to base pair 73,837,045 on chromosome 2
Alström syndrome-gene translation
Alström syndrome-ALMS protein function
Alström syndromemicrotubules
Alström syndrome cilia in photoreceptors
The cilium in the eye
Found inside photoreceptors
“Connecting cilium”
Connects inner segment to outer segment
Carries proteins made in the inner segment, to outer segment
Malfunction stops transport of vital proteins, photoreceptors die
Alström syndrome
Alstrom adult clinics 1998 to 2008
Alström families conference UK
Alström Syndrome
• Further features identified:– Congestive heart failure secondary to
cardiomyopathy– Sensorineural hearing loss – Short stature / advanced bone age / scolosis– Progressive, chronic nephropathy– Liver fibrosis
Check list for exclusion of Alström syndrome in visually impaired young people
Alström Syndrome is one of many “ciliopathies”
In most cases there is blindness, kidney disease, obesity
In all cases it is thought that the cilium is not working, in a number of organs
Primary Cilia Dyskinesia (PCD)Polycystic Kidney Disease (PKD)Joubert Syndrome (JS)Orofaciodigital Syndrome type I (OFD1)Meckel-Gruber Syndrome (MKS)Laurence-Moon-Bardet-Biedl Syndrome (LMBBS/BBS)
Alström syndrome
histology
Overview of studies in AS
• But:-• Cardiomyopathy, diabetes, lipid disorders,liver,
kidney, waterworks problems are variable in extent.
• Suggests influence of other genetic and environmental factors:-
• Are these modifiable?
Cause and effect
?
INSULIN EFFECTS ON INTERMEDIARY METABOLISM
PLASMA PLASMAHEPATOCYTE
GLUCOSE
GLUTRECEPTOR
GLYCOGEN
GLUCOKINASE
PHOSPHORYLASE GLYCOGEN SYNTH
FRUCTOSE 6 PHOS GLYCOLYSIS
LACTATE
PYRUVATE
GLUCONEOGENESIS
CHOLESTEROL
MEVALONIC ACID
HMG CoA
PYRUVATE
ACETYL CoA
KETONEBODIES
TCACYCLE
REDUCTASE
MELONYL FATTY ACIDSCoA
CARNITINEACYL TRANSFERASETRIGLYCERIDE
OXIDATIVEPHOSPHORYLATION30ATP
INSULIN SENSITIVELIPOPROTEIN LIPASE
FA +GLYCEROL
TG
ADIPOCYTE
VLDL
MITOCHONDRION
INSULINSENSITIVE
రర
VLDL
LDL
HDL
Could it all be this?
Overview of studies in AS
• Metabolic treatments• Control of diabetes• Control of serum lipids• Testosterone• Thyroxine• Diet and exercise
• Early detection of major organ damage
• Kidneys• Heart• Liver• Musculoskeletal• urological
Alström syndrome
• Tertiary prevention:• Control diabetes low carb,Metformin,incretin• Control lipids-Niaspan• Slow heart and renal failure• Detect liver fibrosis early• Treat hormone deficiencies• Refine audiology intervention
A hopeful sign
• Neuropathy-amongst 58 Alström subjects with up to 25 yrs of diabetes none had neuropathy compared with young onset non- genetic type 2 diabetic subjects who had 30% neuropathy and 16% foot ulceration.
Proportion of A.S patients with severe cardiomyopathy
75%
25%
Mild /ModerateSevere
Alström syndrome and stem cells
Alström syndrome and stem cells
Procedure for Producing Inducible Pluripotent Stem Cells from a Small Punch Skin Biopsy
Skin biopsy:LA4mm biopsy10 mins
Cultured Dermal Fibroblasts
Pluripotent Stem Cells
Liver Cells
Heart Cells
Muscle Cells
Nerve Cells
Many more...
Freeze and Store
Freeze and Store
Alström syndrome
• ?Hope for the future• Genotype phenotype correlation• Reprogramming of cells in culture to assess
cause of dysfunction• Correction of cell defect and transplantation of
cardiomyocytes.• Insight into more common diabetic, cardiac,
hepatic and renal disease.
Staff involved
Alstrom adult clinics 1998 to 2008
AS UK: Torbay Hospital:
Kay Parkinson Cathy Carey Mary Costelloe
John Parkinson Richard Paisey Claire Rockett
Kevin Goodwin Lee Dobson Kimberley Vogler
Sean Waiting Jamie Smith Chrissie Rowe
Charlotte Parkinson Kathleen Williams Mark Clemence
Kerry Leeson Debbie Hodge Kirsten Mackay
Mike Hales Lynne Bower Sue Bunce
Mark McCarthy Alison White
Sarah Mills Richard Seymour