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At least 19 recordsLinked to original sources
PubMed2002

A novel heterozygous mutation in peroxisome proliferator-activated receptor-gamma gene in a patient with familial partial lipodystrophy.

Familial partial lipodystrophies (FPL) are a heterogeneous group of genetic disorders characterized by marked loss of subcutaneous (sc) fat from the extremities. Affected individuals show an increased preponderance of insulin resistance, diabetes mellitus and dyslipidemia. Recently, lamin A/C gene mutations were found in patients with FPL, Dunnigan variety. However, the genetic basis of other phenotypes remains unknown. We studied peroxisome proliferator-activated receptor-gamma (PPARgamma) gene as a candidate gene in seven FPL patients who did not appear to have Dunnigan variety. Analysis of the coding region of PPARG revealed C to T heterozygous mutation at nucleotide 1273 in exon 6 which changes a highly conserved residue, arginine at position 425 to cysteine (R425C) in the patient FX200.21. The patient is a 64-year-old nonHispanic white woman who developed diabetes mellitus and hypertriglyceridemia at age 32 years and lipodystrophy of the extremities and face at age 50 years. She also had hirsutism. Anthropometry and whole body magnetic resonance imaging revealed marked loss of sc fat particularly from the extremities but sc truncal fat was slightly increased. None of the four unaffected family members harbored the mutation. We conclude that heterozygous, R425C, mutation in PPARG could be the molecular basis for one of the familial partial lipodystrophy phenotypes.

Adipose Tissue↗
PubMed2004

A single-base mutation in the peroxisome proliferator-activated receptor gamma4 promoter associated with altered in vitro expression and partial lipodystrophy.

Familial partial lipodystrophy (FPLD) results from coding sequence mutations either in LMNA, encoding nuclear lamin A/C, or in PPARG, encoding peroxisome proliferator-activated receptor gamma (PPARgamma). The LMNA form is called FPLD2 (MIM 151660), and the PPARG form is called FPLD3 (MIM 604367). We now report a 21-yr-old female with FPLD and no coding sequence mutations in either LMNA or PPARG. She was heterozygous for a novel A>G mutation at position -14 of intron B upstream of PPARG exon 1 within the promoter of the PPARgamma4 isoform. Her less severely affected father, who had features of the metabolic syndrome and a paucity of limb and gluteal fat, was also heterozygous for -14A>G. This mutation was absent among 600 alleles from normal Caucasians. A minimal promoter sequence bearing the mutation had significantly reduced promoter activity when used to drive reporter expression in in vitro expression in two cell lines, compared with the wild-type sequence. This is the first report of a human mutation in the promoter of a PPARgamma isoform. Because the mutation affects PPARgamma4 expression and is associated with FPLD, this implies that PPARgamma4 might be important for fat depot distribution and metabolism in vivo.

3T3-L1 Cells↗
PubMed2002

PPARG F388L, a transactivation-deficient mutant, in familial partial lipodystrophy.

Autosomal dominant familial partial lipodystrophy (FPLD) due to mutant LMNA encoding nuclear lamin A/C is characterized by adipose tissue repartitioning together with multiple metabolic disturbances, including insulin resistance and dyslipidemia. There is emerging evidence that some rare mutations in peroxisome proliferator-activated receptor-gamma (PPAR-gamma), encoded by PPARG, might be associated with human lipodystrophy. We report a three-generation Canadian kindred ascertained based upon partial lipodystrophy, with a normal LMNA gene sequence. Candidate gene sequencing showed that all four affected subjects were heterozygous for a novel T-->A mutation at PPARG nucleotide 1164 in exon 5 that predicted substitution of phenylalanine at codon 388 by leucine (F388L). The mutation was absent from normal family members and normal unrelated subjects, and altered a highly conserved residue within helix 8 of the predicted ligand-binding pocket of PPAR-gamma. The mutant receptor had significantly decreased basal transcriptional activity and impaired stimulation by a synthetic ligand. The germline transmission of a transactivation-deficient mutation in PPARG suggests that autosomal dominant partial lipodystrophy is genetically heterogeneous. Our findings are consistent with the idea that mutant PPARG can underlie the partial lipodystrophy phenotype.

Adult↗
PubMed1999

Adipose tissue distribution pattern in patients with familial partial lipodystrophy (Dunnigan variety).

Familial partial lipodystrophy, Dunnigan type (FPLD), is a rare autosomal dominant genetic disorder characterized by gradual loss of sc fat from the extremities, commencing at the time of puberty. Excess fat deposition may occur in the face and neck area. Limited information is available about adipose tissue distribution in patients with FPLD. To investigate whether there is a unique pattern of fat distribution in both affected men and women with FPLD, we performed whole-body magnetic resonance imaging in one male and three female patients from two pedigrees. Magnetic resonance imaging studies confirmed the clinical findings of near-total absence of sc fat from all extremities. Reduction in sc adipose tissue from the truncal area was more prominent anteriorly than posteriorly. Increased fat stores were observed in the neck and face. Intermuscular adipose tissue in the extremities and pelvic area were subjectively increased. Intraabdominal and intrathoracic adipose tissue was not reduced. Bone marrow fat, as well as mechanical adipose tissue, was present in normal amounts. The pattern of fat distribution in the male and females was similar. We conclude that FPLD results in a characteristic absence of sc fat from the extremities, with preservation of intermuscular fat stores.

Adipose Tissue↗
PubMed2000

Gender differences in the prevalence of metabolic complications in familial partial lipodystrophy (Dunnigan variety).

Familial partial lipodystrophy, Dunnigan type (FPLD; Mendelian Inheritance in Man #151660), is an autosomal dominant disorder characterized by loss of s.c. fat from the extremities and trunk since puberty and predisposition to insulin resistance and its complications. However, for lack of recognition of affected men, previous studies could not ascertain any gender differences in phenotypic expression. Therefore, anthropometric variables and prevalence of diabetes mellitus, dyslipidemia, hypertension, and atherosclerotic vascular disease were compared among 17 postpubertal men and 22 women with FPLD from eight pedigrees. All individuals completed a questionnaire, and fasting blood was analyzed for glucose, insulin, and lipoprotein concentrations. Both affected men and women had similar patterns of fat loss. Compared with the affected men, women had higher prevalence of diabetes (18% and 50%, respectively; P = 0.05) and atherosclerotic vascular disease (12% and 45%, respectively; P = 0.04) and had higher serum triglycerides (median values, 2.27 and 4.25 mmol/L, respectively; P = 0.02) and lower high-density lipoprotein cholesterol concentrations (age-adjusted means, 0.94 and 0.70 mmol/L, respectively; P = 0.04). The prevalence of hypertension and fasting serum insulin concentrations were similar. In conclusion, women with FPLD are more severely affected with metabolic complications of insulin resistance than men. These observations raise the possibility that women with generalized and regional obesity may also have more severe metabolic sequelae of insulin resistance.

Adult↗
PubMed2005

An imaging study of body composition including lipodeposition pattern in a patient of familial partial lipodystrophy (Dunnigan type).

Familial Partial Lipodystrophy, Dunnigan type (FPLD), is characterised by loss of subcutaneous fat from the limbs and an excessive accumulation of fat on the neck, shoulder girdle and face. Affected individuals have insulin resistance, dyslipidaemia and early cardiovascular events. Body composition (BC) with details of adipose tissue distribution were studied by Dual-Energy X-ray Absorptiometry (DEXA) and Magnetic Resonance Imaging (MRI) ina heterozygote for the FPLD mutation LMNA R482W, and in an age, sex and body mass index (BMI) matched normal control. DEXA revealed a marked decrease in total as well as regional fat percentage in the patient compared to a normal control. Marked reductions in subcutaneous fat in the extremities with substantial lipodeposition in the nape of the neck were confirmed with. MRI. The importance of increased perinephric, retroperitoneal and intermuscular fat in the thighs found in this patient, needs to be explored vis-à-vis the pathogenesis of insulin resistance found in FPLD.

Absorptiometry, Photon↗
PubMed2003

Risk factors for diabetes in familial partial lipodystrophy, Dunnigan variety.

OBJECTIVES: Familial partial lipodystrophy, Dunnigan variety (FPLD), is an autosomal dominant disorder due to missense mutations in the lamin A/C (LMNA) gene encoding nuclear lamina proteins. It is characterized by loss of subcutaneous fat from the extremities and trunk and accumulation of fat in the head and neck region beginning at puberty. Patients with FPLD are predisposed to metabolic complications of insulin resistance such as diabetes. We sought to identify risk factors for diabetes in patients with FPLD. RESEARCH DESIGN AND METHODS: A cross-sectional study comparing clinical, biochemical, and anthropometric variables and LMNA genotypes in FPLD patients with and without diabetes. RESULTS: We studied 52 women and 24 men with FPLD from 18 different families. Twenty-eight women (54%) but only four men (17%) had diabetes (P < 0.001); therefore further comparisons were mostly limited to women. Compared with women without diabetes, those with diabetes had higher BMI (median values 23 vs. 24 kg/m(2), respectively; P = 0.03), increased chin skinfold thickness (10 vs. 20 mm; P = 0.001), lower rates of nulliparity (60% vs. 28%; P = 0.04), and higher levels of fasting serum triglycerides (2.4 vs. 3.5 mmol/l; P < 0.001) but similar serum leptin levels (3.4 vs. 3.6 ng/ml; P = 0.9). The prevalence of diabetes was not related to age, menopausal status, family history of type 2 diabetes in unaffected relatives, or LMNA genotype. CONCLUSIONS: We conclude that increased adiposity as reflected by excess subcutaneous fat accumulation in the chin region and parity may predispose women with FPLD to develop diabetes.

Adipose Tissue↗
PubMed2002

Post-mortem findings in familial partial lipodystrophy, Dunnigan variety.

AIMS: Familial partial lipodystrophy, Dunnigan variety (FPLD), is an autosomal dominant disorder due to missense mutations in the lamin A/C gene and is characterized by gradual loss of subcutaneous fat from the extremities and trunk, fat accumulation in the head, neck and intra-abdominal areas, insulin resistance and its metabolic complications. We studied autopsy findings in two patients with FPLD to determine fat distribution and organ involvement. RESULTS: Patient 1, a 66-year-old woman with the R482Q mutation, had diabetes mellitus, dyslipidaemia, and coronary artery disease and died suddenly. Autopsy confirmed the typical body fat distribution and further revealed excess fat deposition in the subpectoral regions extending to the axillae, in the axillary lymph nodes and in the retroperitoneum. Atherosclerotic vascular disease including old infarcts of the myocardium, temporal lobe and kidneys were noted. Severe amyloidosis of the pancreatic islets and grouped muscle atrophy of the quadriceps and diaphragmatic muscles were present. Patient 2, a 29-year-old woman belonging to a pedigree with the R62G mutation, died of hyperlipidaemia-induced acute pancreatitis. Autopsy of patient 2 revealed extensive pancreatitis, hepatic steatosis and polycystic ovaries. CONCLUSIONS: Our study confirms typical body fat distribution and describes new sites of excess fat deposition. Our data show predisposition to atherosclerosis and polycystic ovaries and suggest that pancreatic amyloidosis may underlie development of hyperglycaemia in FPLD patients.

Adipose Tissue↗
PubMed2006

Peroxisomal proliferator activated receptor-gamma deficiency in a Canadian kindred with familial partial lipodystrophy type 3 (FPLD3).

BACKGROUND: Familial partial lipodystrophy (Dunnigan) type 3 (FPLD3, Mendelian Inheritance in Man [MIM] 604367) results from heterozygous mutations in PPARG encoding peroxisomal proliferator-activated receptor-gamma. Both dominant-negative and haploinsufficiency mechanisms have been suggested for this condition. METHODS: We present a Canadian FPLD3 kindred with an affected mother who had loss of fat on arms and legs, but no increase in facial, neck, suprascapular or abdominal fat. She had profound insulin resistance, diabetes, severe hypertriglyceridemia and relapsing pancreatitis, while her pre-pubescent daughter had normal fat distribution but elevated plasma triglycerides and C-peptide and depressed high-density lipoprotein cholesterol. RESULTS: The mother and daughter were each heterozygous for PPARG nonsense mutation Y355X, whose protein product in vitro was transcriptionally inactive with no dominant-negative activity against the wild-type receptor. In addition the mutant protein appeared to be markedly unstable. CONCLUSION: Taken together with previous studies of human PPARG mutations, these findings suggest that PPAR-gamma deficiency due either to haploinsufficiency or to substantial activity loss due to dominant negative interference of the normal allele product's function can each contribute to the FPLD3 phenotype.

Canada↗
PubMed2000

Nuclear lamin A/C R482Q mutation in canadian kindreds with Dunnigan-type familial partial lipodystrophy.

Patients with Dunnigan-type familial partial lipodystrophy (FPLD) are born with normal fat distribution, but after puberty experience regional and progressive adipocyte degeneration, often associated with profound insulin resistance and diabetes. Recently, the FPLD gene was mapped to chromosome 1q21-22, which harbours the LMNA gene encoding nuclear lamins A and C. Mutations in LMNA were shown to underlie autosomal dominant Emery-Dreifuss muscular dystrophy (EDMD-AD), which is characterized by regional and progressive skeletal muscle wasting and cardiac effects. We hypothesized that the analogy between the regional muscle wasting in EDMD-AD and the regional adipocyte degeneration in FPLD, in addition to its chromosomal localization, made LMNA a good candidate gene for FPLD. DNA sequencing of LMNA in five Canadian FPLD probands indicated that each had a novel missense mutation, R482Q, which co-segregated with the FPLD phenotype and was absent from 2000 normal alleles ( P = 1.1 x 10(-13)). This is the first report of a mutation underlying a degenerative disorder of adipose tissue and suggests that LMNA mutations could underlie other diseases characterized by tissue type- and anatomical site-specific cellular degeneration.

Adipocytes↗
PubMed2005

Hepatic steatosis in Dunnigan-type familial partial lipodystrophy.

OBJECTIVES: Characterization of familial clusters of subjects with metabolic derangements predisposing to hepatic steatosis and nonalcoholic steatohepatitis could facilitate genomic studies to identify risk factors for their development. Dunnigan-type familial partial lipodystrophy (FPLD) is an autosomal dominantly inherited disorder caused by mutations in the LMNA gene. Affected subjects have loss of subcutaneous fat from the extremities and symptoms similar to those characterizing the metabolic syndrome, including insulin resistance and dyslipidemia. The goal of this study was to determine the prevalence of steatosis in subjects with FPLD. METHODS: We examined 18 subjects from six families with FPLD for mutations in LMNA and analyzed plasma lipid and serum glucose concentrations. Liver ultrasound and serum aminotransferase activities were used as indicators of steatosis or steatohepatitis. In two subjects, histological examination of hepatic tissue was performed. RESULTS: All subjects had FPLD-causing mutations in LMNA. Plasma lipids were measured in 17 subjects, 16 of whom had hyperlipidemia and 14 presented with either documented insulin resistance or diabetes mellitus. Hepatic steatosis was present in 15 subjects who had ultrasound examinations and 9 of these had elevated serum aminotransferase activities. Liver biopsy confirmed steatosis in 2 subjects. CONCLUSIONS: Hepatic steatosis is part of the clinical phenotype of FPLD. This familial disorder may provide a human metabolic model system to facilitate genomic and environmental studies to determine risk factors for hepatic steatosis and nonalcoholic steatohepatitis.

Adipose Tissue↗
PubMed2005

Long-term treatment experience in a subject with Dunnigan-type familial partial lipodystrophy: efficacy of rosiglitazone.

Dunnigan-type familial partial lipodystrophy (FPLD) is caused by mutations in LMNA, the gene that encodes nuclear lamins A and C. FPLD is characterized by peripheral fat loss, excess central adiposity, insulin resistance, and hyperlipidaemia, which are difficult to treat. We present our 2 years' experience of treatment with rosiglitazone in a subject with FPLD. Insulin requirement decreased significantly from 240 IU/day to 76 IU/day (range 20-240 IU/day) and serum triglyceride concentration was lowered from 13.7 +/- 14.4 mmol/l to 4.5 +/- 4.3 mmol/l and remained stable. Mean HbA(1c) prior to rosiglitazone therapy was 9.4 +/- 1.32% and decreased to 7.4 +/- 0.6% during therapy with rosiglitazone. This case demonstrates the benefits of PPARgamma-agonists on glycaemic control and dyslipidaemia in a patient with FPLD. This in turn implies that PPARgamma may play a pathophysiological role in FPLD.

Aged↗
PubMed2003

Köbberling type of familial partial lipodystrophy: an underrecognized syndrome.

OBJECTIVE: The phenotypic expression of partial lipodystrophy is present in two familial syndromes: familial partial lipodystrophy type 1 (FPLD1), with fat loss from the extremities, and central obesity and FPLD type 2, with fat loss from the extremities, abdomen, and thorax. The latter disorder is associated with mutations in the LMNA gene. FPLD1 is thought to be rare. Here, we report 13 subjects with FPLD1, suggesting that this syndrome is more common than previously thought. RESEARCH DESIGN AND METHODS: Fasting glucose, plasma lipids, leptin, HbA(1c), and anthropomorphic measurements were evaluated in 13 subjects with clinical features of FPLD1 and are compared with two age-matched control groups, with and without diabetes. RESULTS: Only women with clinical features of FPLD1 have been identified. Although they lack extremity and gluteal subcutaneous fat, they do have truncal obesity. Skinfold thickness on the arm and leg was significantly less than that in control subjects. The ratio of skinfold thickness from abdomen to thigh was significantly higher in subjects, suggesting an easy method for identifying affected patients. FPLD1 subjects also had components of the metabolic syndrome, including hypertension, insulin resistance, and severe hypertriglyceridemia resulting in pancreatitis. Premature coronary artery disease was present in 31% of subjects. None of the subjects had coding mutations in the LMNA gene or in the gene coding for peroxisome proliferator-activated receptor (PPAR)-gamma. CONCLUSIONS: FPLD1 is more common than previously described, but the diagnosis is often missed. Early recognition and intensive treatment of hyperlipidemia and diabetes in FPLD1 is important for prevention of pancreatitis and early cardiovascular disease.

Anthropometry↗
PubMed2001

Dyslipemia in familial partial lipodystrophy caused by an R482W mutation in the LMNA gene.

Lipatrophic diabetes, also referred to as familial partial lipodystrophy, is a rare disease that is metabolically characterized by hypertriglyceridemia and insulin resistance. Affected patients typically present with regional loss of body fat and muscular hypertrophic appearance. Variable symptoms may comprise pancreatitis and/or eruptive xanthomas due to severe hypertriglyceridemia, acanthosis nigricans, polycystic ovaria, and carpal tunnel syndrome. Mutations within the LMNA gene on chromosome 1q21.2 were recently reported to result in the phenotype of familial partial lipodystrophy. The genetic trait is autosomal dominant. We identified a family with partial lipodystrophy carrying the R482W (Arg(482)Trp) missense mutation within LMNA. Here we present the lipoprotein characteristics in this family in detail. Clinically, the loss of sc fat and muscular hypertrophy especially of the lower extremities started as early as in childhood. Acanthosis and severe hypertriglyceridemia developed later in life, followed by diabetes. The characterization of the lipoprotein subfractions revealed that affected children present with hyperlipidemia. The presence and severity of hyperlipidemia seem to be influenced by age, apolipoprotein E genotype, and the coexistence of diabetes mellitus. In conclusion, dyslipemia is an early and prominent feature in the presented lipodystrophic family carrying the R482W mutation within LMNA.

Adult↗
PubMed2005

Adipokines and the insulin resistance syndrome in familial partial lipodystrophy caused by a mutation in lamin A/C.

AIMS/HYPOTHESIS: Familial partial lipodystrophy (FPLD) and obesity are both associated with increased risks of type 2 diabetes and cardiovascular disease. Although adipokines have been implicated, few data exist in subjects with FPLD; therefore we investigated a family with FPLD due to a lamin A/C mutation in order to determine how abnormalities of the plasma adipokine profile relate to insulin resistance and the metabolic syndrome. METHODS: Plasma levels of adiponectin, leptin, resistin, IL-1beta, IL-6 and TNF-alpha in 30 subjects (ten patients, 20 controls) were correlated with indices of metabolic syndrome. RESULTS: Compared with controls, FPLD patients had significantly lower plasma levels of adiponectin (3.7+/-1.0 in FDLP cases vs 7.1+/-0.72 mug/ml in controls, p=0.02), leptin (1.23+/-0.4 vs 9.0+/-1.3 ng/ml, p=0.002) and IL-6 (0.59+/-0.12 vs 1.04+/-0.17 pg/ml, p=0.047) and elevated TNF-alpha (34.8+/-8.1 vs 13.7+/-2.7 pg/ml, p=0.028), whereas IL-1beta and resistin were unchanged. In both groups, adiponectin levels were inversely correlated with body fat mass (controls, r=-0.44, p=0.036; FDLP, r=-0.67, p=0.025), insulin resistance (controls, r=-0.62, p=0.003; FDLP, r=-0.70, p=0.025) and other features of the metabolic syndrome. TNF-alpha concentrations were positively related to fat mass (controls, r=0.68, p=0.001; FDLP, r=0.64, p=0.048) and insulin resistance (controls, r=0.86, p=0.001; FDLP, r=0.75, p=0.013). IL-6, IL-1beta and resistin did not demonstrate any correlations with the metabolic syndrome in either group. CONCLUSIONS/INTERPRETATION: Low adiponectin and leptin and high TNF-alpha were identified as the major plasma adipokine abnormalities in FPLD, consistent with the hypothesis that low adiponectin and high TNF-alpha production may be mechanistically related, and perhaps responsible for the development of insulin resistance and cardiovascular disease in FPLD.

Adiponectin↗
PubMed2006

A LMNA splicing mutation in two sisters with severe Dunnigan-type familial partial lipodystrophy type 2.

CONTEXT: To date, all cases of familial partial lipodystrophy type 2 (FPLD2; Mendelian Inheritance in Man 151660) result from missense mutations in LMNA, which encodes nuclear lamin A/C (Mendelian Inheritance in Man 150330). OBJECTIVE: The objective of the study was to carry out mutational analysis of LMNA in two sisters with a particularly severe FPLD2 phenotype. DESIGN: This was a descriptive case report with molecular studies. SETTING: The study was conducted at a referral center. PATIENTS: We report two sisters of South Asian origin. The first presented with acanthosis nigricans at age 5 yr, diabetes with insulin resistance, hypertension and hypertriglyceridemia at age 13 yr, and partial lipodystrophy starting at puberty. Her sister and their mother had a similar metabolic profile and physical features, and their mother died of vascular disease at age 32 yr. INTERVENTIONS: There were no interventions. MAIN OUTCOME MEASURES AND RESULTS: LMNA sequencing showed that the sisters were each heterozygous for a novel G>C mutation at the intron 8 consensus splice donor site, which was absent from the genomes of 300 healthy individuals. The retention of intron 8 in mRNA predicted a prematurely truncated lamin A isoform (516 instead of 664 amino acids) with 20 nonsense 3'-terminal residues. The mutant lamin A isoform failed to interact normally with emerin and failed to localize to the nuclear envelope. CONCLUSIONS: This is the first LMNA splicing mutation to be associated with FPLD2, and it causes a severe clinical and metabolic phenotype.

Acanthosis Nigricans↗
PubMed2003

Response to treatment with rosiglitazone in familial partial lipodystrophy due to a mutation in the LMNA gene.

BACKGROUND: Familial partial lipodystrophy (FPLD) is a monogenic form of diabetes characterised by a dominantly inherited disorder of adipose tissue associated with the loss of subcutaneous fat from the limbs and trunk, with excess fat deposited around the face and neck. The lipodystrophy causes severe insulin resistance, resulting in acanthosis nigricans, diabetes, dyslipidaemia, and increased risk of cardiovascular disease. Preliminary results from animals and man suggest that increasing subcutaneous fat by treatment with thiazolidinediones should improve insulin resistance and the associated features of this syndrome. CASE REPORT: We report a 24-year-old patient with FPLD caused by a mutation in the LMNA gene (R482W) treated with 12 months of rosiglitazone. Subcutaneous fat increased following rosiglitazone treatment as demonstrated by a 29% generalised increase in skin-fold thickness. Leptin levels increased from 5.8 to 11.2 ng/ml. Compared with treatment on Metformin, there was an increase in insulin sensitivity (HOMA S% 17.2-31.6) but no change in glycaemic control. The lipid profile worsened during the follow-up period. CONCLUSION: This initial case suggests that, for modification of cardiovascular risk factors, there are no clear advantages in treating patients with FPLD with rosiglitazone despite increases in subcutaneous adipose tissue. Larger series will be needed to identify moderate beneficial effects and treatment may be more effective in patients with generalised forms of lipodystrophy.

Adult↗