Progeria

Progeria
Other names: Hutchinson–Gilford progeria syndrome (HGPS),[1] progeria syndrome[2]
A young girl with progeria (left). A healthy cell nucleus (right, top) and a progeric cell nucleus (right, bottom).
Pronunciation
SpecialtyMedical genetics
SymptomsGrowth delay, short height, small face, hair loss[1]
ComplicationsHeart disease, stroke, hip dislocations[1]
Usual onset9–24 months[1]
CausesGenetic (autosomal dominant)[1]
Diagnostic methodBased on symptoms, genetic tests[1]
Differential diagnosisHallermann–Streiff syndrome, Gottron's syndrome, Wiedemann–Rautenstrauch syndrome[1]
TreatmentMostly symptomatic[1]
MedicationLonafarnib[5]
PrognosisAverage age at death is 13 years[1]
Frequency1 in 6 million births[1]

Progeria is a genetic disorder in which symptoms resembling early aging occur in childhood.[1] Symptoms generally become apparent between 9 to 24 months of age with decreased growth, small face, and hair loss.[1] Those affected generally die between the age of 8 and 21 years old from heart disease.[1]

The cause is usually a new mutation to a gene that produces the lamin A protein.[1] After having one affected child, the chance of the next child being affected is as high as 3%.[1] It is a type of progeroid syndromes.[1][6] Diagnosis is based on symptoms and confirmed by genetic testing.[1]

Treatment is mostly symptomatic.[1] The medication lonafarnib was approved to treat progeria in 2020.[5] About 1 in 6 million people born are affected.[1] Males and females are affected equally frequently.[1] Progeria was first described in 1886 by Jonathan Hutchinson and 1897 by Hastings Gilford.[1]

Signs and symptoms

(a)Stunted growth, thin limbs (b)Overcrowding of teeth

Children with progeria usually develop the first symptoms during their first few months of life. The earliest symptoms may include a failure to thrive and a localized scleroderma-like skin condition. As a child ages past infancy, additional conditions become apparent, usually around 18–24 months. Limited growth, full-body alopecia (hair loss), and a distinctive appearance (a small face with a shallow recessed jaw and a pinched nose) are all characteristics of progeria.[1] Signs and symptoms of this progressive disease tend to become more marked as the child ages. Later, the condition causes wrinkled skin, kidney failure, loss of eyesight, and atherosclerosis and other cardiovascular problems.[7] Scleroderma, a hardening and tightening of the skin on trunk and extremities of the body, is prevalent. People diagnosed with this disorder usually have small, fragile bodies, like those of older adults. The head is usually large to the body, with a narrow, wrinkled face and a beak nose. Prominent scalp veins are noticeable (made more obvious by alopecia), as well as prominent eyes. Musculoskeletal degeneration causes loss of body fat and muscle, stiff joints, hip dislocations, and other symptoms generally absent in the non-elderly population. Individuals usually retain typical mental and motor development.

Cause

Ultrastructural analysis of the nuclear envelope in fibroblasts from a subject with HGPS. Low magnification transmission electron microscopic image of a passage 10 PT001 nucleus showed several herniations (a). Two higher-magnification images of the same nucleus at sites of blebs (b and c) showed a close apposition of the chromatin to the nuclear envelope. In a, b, and c, the nucleus is to the left. Scale bars correspond to 2 μm in panel a, and 500 nm in panels b and c.

Hutchinson-Gilford syndrome (HPGS) is a autosomal dominant genetic disorder.[8] HPGS is caused by mutations that weaken the structure of the cell nucleus, making normal cell division difficult. The histone mark H4K20me3 is involved and caused by de novo mutations that occurs in a gene that encodes lamin A. Lamin A is made but isn't processed properly. This poor processing creates an abnormal nuclear morphology and disorganized heterochromatin. Patients also don't have appropriate DNA repair, and they also have increased genomic instability.[9]

In normal conditions, the LMNA gene codes for a structural protein called prelamin A, which undergoes a series of processing steps before attaining its final form, called lamin A.[10] Prelamin A contains a “CAAX”where C is a cysteine, an aliphatic amino acid, and X any amino acid. This motif at the carboxyl-termini of proteins triggers three sequential enzymatic modifications. First, protein farnesyltransferase catalyzes the addition of a farnesyl moiety to the cysteine. Second, an endoprotease that recognizes the farnesylated protein catalyzes the peptide bond's cleavage between the cysteine and -aaX. In the third step, isoprenylcysteine carboxyl methyltransferase catalyzes methylation of the carboxyl-terminal farnesyl cysteine. The farnesylated and methylated protein is transported through a nuclear pore to the interior of the nucleus. Once in the nucleus, the protein is cleaved by a protease called zinc metallopeptidase STE24 (ZMPSTE24), which removes the last 15 amino acids, which includes the farnesylated cysteine. After cleavage by the protease, prelamin A is referred to as lamin A. In most mammalian cells, lamin A, along with lamin B1, lamin B2, and lamin C, makes up the nuclear lamina, which provides structural support nucleus. Before the late 20th century, research on progeria yielded very little information about the syndrome. In 2003, the cause of progeria was discovered to be a point mutation in position 1824 of the LMNA gene, which replaces a cytosine with thymine.[11] This mutation creates a 5' cryptic splice site within exon 11, resulting in a shorter than normal mRNA transcript. When this shorter mRNA is translated into protein, it produces an abnormal variant of the prelamin A protein, referred to as progerin. Progerin's farnesyl group cannot be removed because the ZMPSTE24 cleavage site is lacking from progerin, so the abnormal protein is permanently attached to the nuclear rim. One result is that the nuclear lamina does not provide the nuclear envelope with enough structural support, causing it to take on an abnormal shape.[12] Since the support that the nuclear lamina normally provides is necessary for the organizing of chromatin during mitosis, weakening of the nuclear lamina limits the ability of the cell to divide.[13] However, defective cell division is unlikely to be the main defect leading to progeria, particularly because children develop normally without any signs of disease until about one year of age. Farnesylated prelamin A variants also leads to defective DNA repair, which may play a role in the development of progeria.[14] Progerin expression also leads to defects in the establishment of fibroblast cell polarity, which is also seen in physiological aging.[15]

To date over 1,400 SNPs in the LMNA gene are known.[16] They can manifest as changes in mRNA, splicing, or protein amino acid sequence (e.g. Arg471Cys,[17] Arg482Gln,[18] Arg527Leu,[19] Arg527Cys,[20] Ala529Val[21]).

Progerin may also play a role in normal human aging, since its production is activated in typical senescent cells.[13]

Unlike other "accelerated aging diseases" (such as Werner syndrome, Cockayne syndrome or xeroderma pigmentosum), progeria may not be directly caused by defective DNA repair. These diseases each cause changes in a few specific aspects of aging, but never in every aspect at once, so they are often called "segmental progerias."[22]

A 2003 report in Nature[23] said that progeria may be a de novo dominant trait. It develops during cell division in a newly conceived zygote or in the gametes of one of the parents. It is caused by mutations in the LMNA (lamin A protein) gene on chromosome 1; the mutated form of lamin A is commonly known as progerin. One of the authors, Leslie Gordon, was a physician who did not know anything about progeria until her own son, Sam, was diagnosed at 22 months. Gordon and her husband, pediatrician Scott Berns, founded the Progeria Research Foundation.[24]

Lamin A

Lamin A is a major component of a protein scaffold on the inner edge of the nucleus called the nuclear lamina that helps organize nuclear processes such as RNA and DNA synthesis.

Prelamin A contains a CAAX box at the C-terminus of the protein (where C is a cysteine and A is any aliphatic amino acids). This ensures that the cysteine is farnesylated and allows prelamin A to bind membranes, specifically the nuclear membrane. After prelamin A has been localized to the cell nuclear membrane, the C-terminal amino acids, including the farnesylated cysteine, are cleaved off by a specific protease. The resulting protein, now lamin A, is no longer membrane-bound and carries out functions inside the nucleus.

In HGPS, the recognition site that the enzyme requires for cleavage of prelamin A to lamin A is mutated. Lamin A cannot be produced, and prelamin A builds up on the nuclear membrane, causing a characteristic nuclear blebbing.[25] This results in the symptoms of progeria, although the relationship between the misshapen nucleus and the symptoms is not known.

A study that compared HGPS patient cells with the skin cells from young and elderly normal human subjects found similar defects in the HGPS and elderly cells, including down-regulation of certain nuclear proteins, increased DNA damage, and demethylation of histone, leading to reduced heterochromatin.[26] Nematodes over their lifespan show progressive lamin changes comparable to HGPS in all cells but neurons and gametes.[27] These studies suggest that lamin A defects are associated with normal aging.[26][28]

Diagnosis

Skin changes, abnormal growth, and loss of hair occur. These symptoms normally start appearing by one year of age. A genetic test for LMNA mutations can confirm the diagnosis of progeria.[29][30] Prior to the advent of the genetic test, misdiagnosis was common.[30]

Treatment

In 2020, lonafarnib was approved in the United States and helps prevent buildup of defective progerin and similar proteins.[31] A trial in 2018 points lower mortality rates ~ treatment with lonafarnib alone compared with no treatment (3.7% vs. 33.3%) ~ at a median post-trial follow-up time span of 2.2 years.[32]

Other treatment options have focused on reducing complications (such as cardiovascular disease) with coronary artery bypass surgery and low-dose aspirin.[33]

Growth hormone treatment has been attempted.[34] The use of Morpholinos has also been attempted in mice and cell cultures in order to reduce progerin production. Antisense Morpholino oligonucleotides specifically directed against the mutated exon 11–exon 12 junction in the mutated pre-mRNAs were used.[35]

A type of anticancer drug, the farnesyltransferase inhibitors (FTIs), has been proposed, but their use has been mostly limited to animal models.[36] A Phase II clinical trial using the FTI lonafarnib began in May 2007.[37] In studies on the cells another anti-cancer drug, rapamycin, caused removal of progerin from the nuclear membrane through autophagy.[12][38] It has been proved that pravastatin and zoledronate are effective drugs when it comes to the blocking of farnesyl group production.

Farnesyltransferase inhibitors (FTIs) are drugs that inhibit the activity of an enzyme needed to make a link between progerin proteins and farnesyl groups. This link generates the permanent attachment of the progerin to the nuclear rim. In progeria, cellular damage can occur because that attachment occurs, and the nucleus is not in a normal state. Lonafarnib is an FTI, which means it can avoid this link, so progerin can not remain attached to the nucleus rim, and it now has a more normal state.

Studies of sirolimus, an mTOR Inhibitor, demonstrate that it can minimize the phenotypic effects of progeria fibroblasts. Other observed consequences of its use are abolishing nuclear blebbing, degradation of progerin in affected cells, and reducing insoluble progerin aggregates formation. These results have been observed only in vitro and are not the results of any clinical trial, although it is believed that the treatment might benefit HGPS patients.[12]

Prognosis

As there is no known cure, few people with progeria exceed 13 years of age.[39] At least 90 percent of patients die from complications of atherosclerosis, such as heart attack or stroke.[40]

Mental development is not adversely affected; in fact, intelligence tends to be average to above average.[41] With respect to the features of aging that progeria appears to manifest, the development of symptoms is comparable to aging at a rate eight to ten times faster than normal. With respect to features of aging that progeria does not exhibit, patients show no neurodegeneration or cancer predisposition. They also do not develop conditions that are commonly associated with aging, such as cataracts (caused by UV exposure) and osteoarthritis.[29]

Although there may not be any successful treatments for progeria itself, there are treatments for the problems it causes, such as arthritic, respiratory, and cardiovascular problems. Sufferers of progeria have normal reproductive development, and there are known cases of women with progeria who delivered healthy offspring.[42]

Epidemiology

A study from the Netherlands has shown an incidence of 1 in 20 million births.[43] According to the Progeria Research Foundation, there are currently about 161 known cases in the world.[44] Hundreds of cases have been reported in medical history since 1886.[45][46][47] However, the Progeria Research Foundation believes there may be as many as 150 undiagnosed cases worldwide.[48]

There have been only two cases in which a healthy person was known to carry the LMNA mutation that causes progeria.[49] One family from India had five children with progeria.[50]

History

Progeria was first described in 1886 by Jonathan Hutchinson.[51] It was also described independently in 1897 by Hastings Gilford.[52] The condition was later named Hutchinson–Gilford progeria syndrome. Scientists are interested in progeria partly because it might reveal clues about the normal process of aging.[53][49][54]

Etymology

The word progeria comes from the Greek words "pro" (πρό), meaning "before" or "premature", and "gēras" (γῆρας), meaning "old age".[55]

Society and culture

Notable cases

In 1987, fifteen-year-old Mickey Hays, who had progeria, appeared along with Jack Elam in the documentary I Am Not a Freak.[56] Elam and Hays first met during the filming of the 1986 film The Aurora Encounter,[57] in which Hays was cast as an alien. The friendship that developed lasted until Hays died in 1992, on his 20th birthday. Elam said, "You know I've met a lot of people, but I've never met anybody that got next to me like Mickey."

Harold Kushner's 1978 book When Bad Things Happen to Good People, which explores God and the problem of evil, was written in response to his 14-year-old son's death due to progeria.

Margaret Casey, a 29-year-old progeria victim believed to be the oldest survivor of the premature aging disease, died on Sunday, May 26, 1985. Casey, a free-lance artist, was admitted to Yale-New Haven Hospital Saturday night May 25th with respiratory problems, which caused her death.[58]

Sam Berns was an American activist with the disease. He was the subject of the HBO documentary Life According to Sam. Berns also gave a TEDx talk titled My Philosophy for a Happy Life on December 13th, 2013.[59]

Hayley Okines was an English progeria patient who spread awareness of the condition.[60]

Rania was a French progeria victim who died on October 16, 2020, at the age of 16. She was a popular creator on the social media platforms TikTok, Instagram and Youtube with 871,000 followers on TikTok, 700,000 on Instagram and 320,000 on Youtube. [61]

Perhaps one of the earliest influences of progeria on popular culture occurred in the 1922 short story "The Curious Case of Benjamin Button" by F. Scott Fitzgerald (later adapted into a feature film in 2008). The main character is born as a 70-year-old man and ages backward.[62] Charles Dickens may also have described a case of progeria in the Smallweed family of Bleak House, specifically in the grandfather and his grandchildren, Judy and twin brother Bart.[63] A character who is explicitly described as suffering from progeria is also among the protagonists in Tad Williams's science-fiction tetralogy Otherland.

The condition has also been featured in multiple films. In the 1983 film The Hunger, progeria was the focus of study by Susan Sarandon's character, Dr. Sarah Roberts.

The 1984 film The Three Wishes of Billy Grier stars Ralph Macchio as a teenager who tries to fulfill his wishes before he dies from the disease.

The 1996 movie Jack deals with the eponymous character (Robin Williams) who has a genetic disorder similar to progeria and the difficulties he faces fitting into society.[64]

The 2009 movie PAA starring Amitabh Bachchan and Abhishek Bachchan is based on the relationship of a boy with a rare genetic condition known as progeria and his parents.

Research

Mouse model

A mouse model of progeria exists, though in the mouse, the LMNA prelamin A is not mutated. Instead, ZMPSTE24, the specific protease that is required to remove the C-terminus of prelamin A, is missing. Both cases result in the buildup of farnesylated prelamin A on the nuclear membrane and in the characteristic nuclear LMNA blebbing.

DNA repair

Repair of DNA double-strand breaks can occur by either of two processes, non-homologous end joining (NHEJ) or homologous recombination (HR). A-type lamins promote genetic stability by maintaining levels of proteins that have key roles in NHEJ and HR.[65] Mouse cells deficient for maturation of prelamin A show increased DNA damage and chromosome aberrations and have increased sensitivity to DNA damaging agents.[14] In progeria, the inability to adequately repair DNA damages due to defective A-type lamin may cause aspects of premature aging[66] (also see DNA damage theory of aging).

Epigenetic clock

Fibroblast samples from children with progeria syndrome exhibit accelerated epigenetic aging effects according to the epigenetic clock for skin & blood samples.[67]

References

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