Entry - *126380 - ERCC EXCISION REPAIR 1, ENDONUCLEASE NONCATALYTIC SUBUNIT; ERCC1 - OMIM
 
* 126380

ERCC EXCISION REPAIR 1, ENDONUCLEASE NONCATALYTIC SUBUNIT; ERCC1


Alternative titles; symbols

EXCISION REPAIR, COMPLEMENTING DEFECTIVE, IN CHINESE HAMSTER, 1
DNA REPAIR DEFECT UV-20 OF CHINESE HAMSTER OVARY CELLS, COMPLEMENTATION OF; UV20


HGNC Approved Gene Symbol: ERCC1

Cytogenetic location: 19q13.32     Genomic coordinates (GRCh38): 19:45,407,334-45,451,547 (from NCBI)


Gene-Phenotype Relationships
Location Phenotype Phenotype
MIM number
Inheritance Phenotype
mapping key
19q13.32 Cerebrooculofacioskeletal syndrome 4 610758 AR 3

TEXT

Description

The ERCC1 gene encodes a protein involved in nucleotide excision repair (NER) and interstrand crosslink (ICL) repair of DNA. ERCC1 interacts with ERCC4 (133520) to form an endonuclease that excises the DNA for subsequent repair. ERCC1 is needed for stabilizing and enhancing ERCC4 activity (summary by Gregg et al., 2011 and Kashiyama et al., 2013).


Cloning and Expression

Following DNA-mediated gene transfer into Chinese hamster ovary (CHO) mutant cells that, like xeroderma pigmentosum (see 278700) cells, are sensitive to a variety of DNA damaging agents and are defective in the initial incision step of DNA repair, Rubin et al. (1983) identified the human DNA repair gene ERCC1. The resulting transformants exhibited normal resistance to DNA damaging agents, and independent transformants demonstrated a common set of human DNA sequences associated with a human DNA repair gene. Thus, both direct biologic and molecular evidence for DNA-mediated transfer of a human DNA repair gene into repair-deficient hamster mutants was provided.


Gene Function

Li et al. (1994) demonstrated that the repair protein XPA (611153) is a factor that associates with ERCC1. A possible function of XPA, suggested by their results, is the loading and possible orientation of an incision complex containing ERCC1 and other repair factors to the site of DNA damage. Park and Sancar (1994) presented the results of studies leading them to conclude that XPA, ERCC1, and ERCC4 (133520) proteins form a ternary complex that participates in both damage recognition and incision activities.

Sijbers et al. (1996) performed mutational analysis on ERCC1. They found that the poorly conserved N-terminal 91 amino acids are not essential for its repair functions, while the C-terminal is essential for enzymatic activity and is presumed to be a structure-specific endonuclease. Mutations in the central region gave rise to unstable proteins, leading the authors to suggest that this region is involved in protein-protein interactions. Sijbers et al. (1996) stated that ERCC1 is involved in both UV cross-link repair and nucleotide excision repair (NER) and presented evidence that cross-link repair requires lower amounts of ERCC1 than does NER, which may explain why group F xeroderma pigmentosum (278760) patients present a deficiency in NER rather than in cross-link repair.

To study the nuclear organization and dynamics of nucleotide excision repair, Houtsmuller et al. (1999) tagged the ERCC1 subunit of the ERCC1/XPF (278760) endonuclease with green fluorescent protein and monitored its mobility in living Chinese hamster ovary cells. In the absence of DNA damage, the complex moved freely through the nucleus, with a diffusion coefficient (15 +/- 5 square microns per second) consistent with its molecular size. Ultraviolet light-induced DNA damage caused a transient dose-dependent immobilization of ERCC1/XPF, likely due to engagement of the complex in a single repair event. After 4 minutes, the complex regained mobility. These results suggested that nucleotide excision repair operates by assembly of individual nucleotide excision repair factors at sites of DNA damage rather than by preassembly of holocomplexes, and that ERCC1/XPF participates in repair of DNA damage in a distributive fashion rather than by processive scanning of large genome segments.

Volker et al. (2001) described the assembly of the NER complex in normal and repair-deficient (xeroderma pigmentosum) human cells by employing a novel technique of local ultraviolet irradiation combined with fluorescent antibody labeling. The damage-recognition complex XPC (613208)-HR23B (600062) appeared to be essential for the recruitment of all subsequent NER factors in the preincision complex, including transcription repair factor TFIIH (see 189972). Volker et al. (2001) found that XPA associates relatively late, is required for anchoring of ERCC1-XPF, and may be essential for activation of the endonuclease activity of XPG (133530). These findings identified XPC as the earliest known NER factor in the reaction mechanism, gave insight into the order of subsequent NER components, provided evidence for a dual role of XPA, and supported a concept of sequential assembly of repair proteins at the site of damage rather than a preassembled repairosome.

Repair of double-strand breaks in DNA via the Fanconi anemia (FA; 227650) pathway requires the monoubiquitination of FANCD2 (227646), leading to the accumulation of ubiquitinated FANCD2 at sites of DNA damage. Using normal human fibroblasts depleted of ERCC1 via small interfering RNA and fibroblasts from FA patients, McCabe et al. (2008) showed that ERCC1 was required for both monoubiquitination of FANCD2 and the accumulation of ubiquitinated FANCD2 at sites of DNA damage. ERCC1 was required for FANCD2 foci formation following DNA crosslinking, which can be repaired following the formation of a double-strand break, and on stalled replication forks, which include double-strand breaks. McCabe et al. (2008) concluded that ERCC1 is not required for the formation of double-strand breaks but is required for the activation of FANCD2 for their repair.

By coimmunoprecipitation and yeast 2-hybrid analyses, Perez-Oliva et al. (2015) found that the N-terminal 61 amino acids of human USP45 (618439) interacted with ERCC1. USP45 deubiquitylated ERCC1 both in vitro and in vivo, and association of USP45 with ERCC1 was required for ERCC1 deubiquitylation. USP45 promoted survival of U2OS osteosarcoma cells exposed to DNA-damaging agents and induced DNA damage responses controlled by the ERCC1-XPF endonuclease. USP45 exerted its effects not by stabilizing ERCC1 expression, but by regulating recruitment of ERCC1 to DNA damage sites. USP45 localized to DNA lesions resulting from DNA-damaging agents and controlled repair. Live-cell fluorescence analysis revealed that recruitment of USP45 to damage sites was rapid, transient, and independent of ERCC1-XPF.


Gene Structure

The ERCC1 gene consists of 10 exons spread over approximately 14 kb (van Duin et al., 1987).


Mapping

To human chromosome 19, Siciliano et al. (1985) assigned 2 genes that complement separate DNA repair mutations in Chinese hamster ovary (CHO) cells. One of them complemented a CHO DNA repair deficiency mutant called UV20; the human locus was called ERCC1 (Thompson et al., 1985). The other CHO repair mutant, called EM9, differed in respect to the agents to which it was sensitive and had greatly increased sister chromatid exchanges (Thompson et al., 1982) as in Bloom syndrome (210900); the human locus was called ERCC2 (126340). Human chromosome 19 is thought to be homologous to hamster 9--both have GPI (172400) and PEPD (613230)--and in CHO cells chromosome 9 is hemizygous. The findings probably indicate that the 2 DNA repair genes are syntenic in the hamster also.

De Wit et al. (1985) also mapped to chromosome 19 a human DNA repair gene that complemented the defect in a repair-defective CHO cell line. ERCC1 was so named for 'excision repair complementing defective repair in Chinese hamster.' De Wit et al. (1985) concluded that this is the same gene as that found by Rubin et al. (1985).

By somatic cell hybridization, Brook et al. (1985) assigned the ERCC1 gene to chromosome 19q13.3-q13.2.

ERCC1 has significant amino acid sequence homology with the yeast excision repair protein RAD10 (van Duin et al., 1986). Another gene involved in DNA repair, XRCC1 (194360), is located in the same region of chromosome 19 (Carrano, 1988). In the course of characterizing ERCC1, Hoeijmakers et al. (1989) found that its 3-prime terminus overlapped the 3-prime end of another gene, designated ASE1 (antisense ERCC1; 107325). This exceptional type of gene overlap was conserved in the mouse and even in the yeast ERCC1 homolog, RAD10, suggesting an important biologic function.

With automated fluorescence-based sequences, Martin-Gallardo et al. (1992) sequenced a total of 116,118 bp derived from 3 cosmids spanning the ERCC1 locus. The assembled sequence analyzed by polymerase chain reaction (PCR) amplification and computer methods totaled 105,831 bp and contained, in addition to the ERCC1 gene, an FOSB protooncogene (164772), a gene encoding a protein phosphatase, and 2 genes of unknown function. The 19q13.3 light-band region had a high average density of 1.4 Alu repeats per kilobase. Martin-Gallardo et al. (1992) estimated that the light bands of the human karyotype could contain as many as 75,000 genes and 1.5 million Alu repeats. By several lines of evidence (Langlois et al., 1982; McKusick, 1991), chromosome 19 appears to be unusually densely populated with genes.

As part of the mapping of multiple probes on chromosome 19 by fluorescence in situ hybridization, Trask et al. (1993) mapped the ERCC1 gene to 19q13.2-q13.3.


Molecular Genetics

In a patient with cerebrooculofacioskeletal syndrome (COFS4; 610758), Jaspers et al. (2007) found compound heterozygous mutations in the ERCC1 gene (Q158X, 126380.0001; F231L, 126380.0002). The patient reported by Jaspers et al. (2007) displayed relatively mild impairment of NER, similar to that seen in XPF cases, but had very severe clinical manifestations, including pre- and postnatal developmental failure and death in early infancy. Patient cells showed moderate hypersensitivity to ultraviolet rays and mitomycin C. This discovery represented a novel complementation group of patients with defective NER. Furthermore, the clinical severity, coupled with a relatively mild repair defect, suggested novel functions for ERCC1. Although ERCC1 was the first mammalian repair gene to be cloned (Westerveld et al., 1984) and targeted in mice (McWhir et al., 1993), no case of an ERCC1 defect was identified until the report of Jaspers et al. (2007), despite exhaustive screens in photosensitive patients for 3 decades.

In a patient with severe growth and skeletal abnormalities resulting in early death and associated with defective NER, Kashiyama et al. (2013) identified homozygosity for the F231L mutation in the ERCC1 gene. Patient cells showed decreased expression of both ERCC1 and ERCC4 (133520).

Imoto et al. (2007) reported a woman (XP202DC) with xeroderma pigmentosum and neurologic features who was compound heterozygous for 2 mutations in the ERCC1 gene (K226X and IVS-26G-A). In addition to sun sensitivity, she developed progressive neurodegeneration with dementia and generalized brain atrophy at age 15 and died at age 37 years. The phenotype was similar to that reported in patients with XPF (278760) due to mutations in the ERCC4 gene (133520). ERCC1 and ERCC4 form a complex with endonuclease activity during a late stage of nucleotide excision repair of DNA.


Animal Model

McWhir et al. (1993) produced mice with defective DNA by targeting the ERCC1 gene in an embryonic stem cell line. Homozygous mutant mice were runted at birth and died before weaning with liver failure. Examination of organs showed polyploidy in perinatal liver, progressing to severe aneuploidy by 3 weeks of age. Elevated levels of p53 (191170) were detected in liver, brain and kidney, supporting the hypothesized role for p53 as a monitor of DNA damage. As pointed out by Cleaver (1994), the ERCC1 gene had not been found in association with any specific human disease and was only indirectly presumed to be essential. The findings of McWhir et al. (1993) may suggest pathologic implications of mutations in this gene in the human.

Niedernhofer et al. (2006) studied Ercc1-deficient mice. Embryonic and early postnatal development was mildly retarded, but growth arrests dramatically in the second week, typically culminating in death by 4 weeks. Ercc1-null mice showed skin, liver, and bone marrow abnormalities similar to those seen in normal aging. Niedernhofer et al. (2006) also identified dystonia and progressive ataxia, renal insufficiency, sarcopenia, kyphosis, and, at the cellular level, premature replicative senescence and sensitivity to oxidative stress--all changes associated with advanced age. The authors noted a striking correlation between the phenotype of Ercc1-null mice and that of human XFE progeroid syndrome (610965). Furthermore, ERCC4 (133520), which is defective in XFE progeroid syndrome, is undetectable in Ercc1-null mouse tissue, indicating destabilization of the ERCC4/ERRC1 complex. Niedernhofer et al. (2006) found that these and other changes correlated with those seen in aged mice and developed a model connecting DNA damage, the growth hormone axis, and aging.

Vermeij et al. (2016) reported that a dietary restriction of 30% tripled the median and maximal remaining life spans of Ercc1 delta/- progeroid mice, strongly retarding numerous aspects of accelerated aging. Mice undergoing dietary restriction retained 50% more neurons and maintained full motor function far beyond the life span of mice fed ad libitum. Ercc5 (133530) -/- mice, another DNA repair-deficient progeroid mouse that models Cockayne syndrome (see 278780), responded similarly. The dietary restriction response in Ercc1 delta/- mice closely resembled the effects of dietary restriction in wildtype animals. Notably, liver tissue from Ercc1 delta/- mice fed ad libitum showed preferential extinction of the expression of long genes, a phenomenon also observed in several tissues aging normally. This is consistent with the accumulation of stochastic, transcription-blocking lesions that affect long genes more than short ones. Dietary restriction largely prevented this declining transcriptional output and reduced the number of gamma-H2AX (601772) DNA damage foci, indicating that dietary restriction preserves genome function by alleviating DNA damage. Vermeij et al. (2016) concluded that their findings established the Ercc1 delta/- mouse as a powerful model organism for health-sustaining interventions, revealed potential for reducing endogenous DNA damage, facilitated a better understanding of the molecular mechanism of dietary restriction, and suggested a role for counterintuitive dietary restriction-like therapy for human progeroid genome instability syndromes and possibly neurodegeneration in general.


ALLELIC VARIANTS ( 2 Selected Examples):

.0001 CEREBROOCULOFACIOSKELETAL SYNDROME 4

ERCC1, GLN158TER
  
RCV000018265

In an infant (165TOR) with a severe disorder compatible with a diagnosis of cerebrooculofacioskeletal syndrome (COFS4; 610758), Jaspers et al. (2007) found compound heterozygosity for 2 mutations in the ERCC1 gene: a C-to-T transition predicted to convert codon gln158 into an amber translational stop signal (CAG to TAG; Q158X), inherited from the mother, and a C-to-G transversion predicted to change phe231 to leucine (F231L; 126380.0002), inherited from the father. The phe231 residue lies within the XPF binding domain of ERCC1 and is fully conserved among mammals and in X. laevis. The allele derived from the mother encoded a truncated polypeptide that lacked the entire C-terminal domain, which is essential for interaction with XPF. Heterodimerization of ERCC1-XPF is required for stability of the complex and for its endonuclease activity. Therefore, the Q158X allele was expected to be functionally null.


.0002 CEREBROOCULOFACIOSKELETAL SYNDROME 4

ERCC1, PHE231LEU
  
RCV000018266...

For discussion of the phe231-to-leu (F231L) mutation in the ERCC1 gene that was found in compound heterozygous state in a patient with cerebrooculofacioskeletal syndrome (COFS4; 610758) by Jaspers et al. (2007), see 126380.0001.

In a girl (CS20LO), born of unrelated parents, with facial and skeletal abnormalities (610758), Kashiyama et al. (2013) identified a homozygous 693C-G transversion in exon 7 of the ERCC1 gene, resulting in a phe231-to-leu substitution in the C-terminal XPF-interacting helix-hairpin-helix domain. The patient had microcephaly, micrognathia, deep-set eyes, multiple contractures, nystagmus, and possible polymicrogyria. She was diagnosed as having Cockayne syndrome on the basis of impaired RNA synthesis after UV radiation, indicating a defect in TC-NER. Patient cells also showed a decrease in unscheduled DNA synthesis, indicating a defect in global genome NER (GG-NER). In vitro cellular expression studies showed that the F231L mutation did not alter binding to ERCC4 (133520) or to TFIIH (see 189972) and that overexpression of the mutant protein was able to restore NER activity in the patient's cells. However, patient cells showed very low expression of the mutant allele (50-fold less than control), suggesting that the ERCC1-null phenotype in this patient was due to attenuated mRNA expression. Kashiyama et al. (2013) noted that the patient reported by Jaspers et al. (2007) had clinical features that overlapped with Cockayne syndrome.


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Bao Lige - updated : 05/20/2019
Ada Hamosh - updated : 09/28/2016
Cassandra L. Kniffin - updated : 6/20/2013
Patricia A. Hartz - updated : 6/29/2009
Ada Hamosh - updated : 4/20/2007
Victor A. McKusick - updated : 2/8/2007
Stylianos E. Antonarakis - updated : 8/3/2001
Ada Hamosh - updated : 5/6/1999
Ada Hamosh - updated : 5/5/1999
Jennifer P. Macke - updated : 6/6/1997
Creation Date:
Victor A. McKusick : 6/4/1986
carol : 09/17/2022
carol : 09/16/2022
carol : 09/06/2022
mgross : 05/20/2019
alopez : 09/28/2016
mcolton : 06/03/2015
carol : 2/9/2015
mcolton : 2/6/2015
mcolton : 2/5/2015
alopez : 7/30/2013
alopez : 7/3/2013
ckniffin : 6/20/2013
carol : 1/26/2010
carol : 1/12/2010
alopez : 7/1/2009
terry : 6/29/2009
terry : 9/19/2007
carol : 7/12/2007
alopez : 4/24/2007
terry : 4/20/2007
alopez : 2/12/2007
terry : 2/8/2007
alopez : 9/30/2003
mgross : 8/3/2001
alopez : 5/7/1999
alopez : 5/6/1999
terry : 5/5/1999
terry : 5/5/1999
psherman : 5/8/1998
mark : 11/11/1997
alopez : 9/10/1997
alopez : 9/8/1997
terry : 7/28/1997
terry : 3/21/1997
carol : 11/17/1995
mimadm : 4/18/1994
carol : 12/9/1993
carol : 2/11/1993
carol : 6/18/1992
carol : 5/18/1992

* 126380

ERCC EXCISION REPAIR 1, ENDONUCLEASE NONCATALYTIC SUBUNIT; ERCC1


Alternative titles; symbols

EXCISION REPAIR, COMPLEMENTING DEFECTIVE, IN CHINESE HAMSTER, 1
DNA REPAIR DEFECT UV-20 OF CHINESE HAMSTER OVARY CELLS, COMPLEMENTATION OF; UV20


HGNC Approved Gene Symbol: ERCC1

Cytogenetic location: 19q13.32     Genomic coordinates (GRCh38): 19:45,407,334-45,451,547 (from NCBI)


Gene-Phenotype Relationships

Location Phenotype Phenotype
MIM number
Inheritance Phenotype
mapping key
19q13.32 Cerebrooculofacioskeletal syndrome 4 610758 Autosomal recessive 3

TEXT

Description

The ERCC1 gene encodes a protein involved in nucleotide excision repair (NER) and interstrand crosslink (ICL) repair of DNA. ERCC1 interacts with ERCC4 (133520) to form an endonuclease that excises the DNA for subsequent repair. ERCC1 is needed for stabilizing and enhancing ERCC4 activity (summary by Gregg et al., 2011 and Kashiyama et al., 2013).


Cloning and Expression

Following DNA-mediated gene transfer into Chinese hamster ovary (CHO) mutant cells that, like xeroderma pigmentosum (see 278700) cells, are sensitive to a variety of DNA damaging agents and are defective in the initial incision step of DNA repair, Rubin et al. (1983) identified the human DNA repair gene ERCC1. The resulting transformants exhibited normal resistance to DNA damaging agents, and independent transformants demonstrated a common set of human DNA sequences associated with a human DNA repair gene. Thus, both direct biologic and molecular evidence for DNA-mediated transfer of a human DNA repair gene into repair-deficient hamster mutants was provided.


Gene Function

Li et al. (1994) demonstrated that the repair protein XPA (611153) is a factor that associates with ERCC1. A possible function of XPA, suggested by their results, is the loading and possible orientation of an incision complex containing ERCC1 and other repair factors to the site of DNA damage. Park and Sancar (1994) presented the results of studies leading them to conclude that XPA, ERCC1, and ERCC4 (133520) proteins form a ternary complex that participates in both damage recognition and incision activities.

Sijbers et al. (1996) performed mutational analysis on ERCC1. They found that the poorly conserved N-terminal 91 amino acids are not essential for its repair functions, while the C-terminal is essential for enzymatic activity and is presumed to be a structure-specific endonuclease. Mutations in the central region gave rise to unstable proteins, leading the authors to suggest that this region is involved in protein-protein interactions. Sijbers et al. (1996) stated that ERCC1 is involved in both UV cross-link repair and nucleotide excision repair (NER) and presented evidence that cross-link repair requires lower amounts of ERCC1 than does NER, which may explain why group F xeroderma pigmentosum (278760) patients present a deficiency in NER rather than in cross-link repair.

To study the nuclear organization and dynamics of nucleotide excision repair, Houtsmuller et al. (1999) tagged the ERCC1 subunit of the ERCC1/XPF (278760) endonuclease with green fluorescent protein and monitored its mobility in living Chinese hamster ovary cells. In the absence of DNA damage, the complex moved freely through the nucleus, with a diffusion coefficient (15 +/- 5 square microns per second) consistent with its molecular size. Ultraviolet light-induced DNA damage caused a transient dose-dependent immobilization of ERCC1/XPF, likely due to engagement of the complex in a single repair event. After 4 minutes, the complex regained mobility. These results suggested that nucleotide excision repair operates by assembly of individual nucleotide excision repair factors at sites of DNA damage rather than by preassembly of holocomplexes, and that ERCC1/XPF participates in repair of DNA damage in a distributive fashion rather than by processive scanning of large genome segments.

Volker et al. (2001) described the assembly of the NER complex in normal and repair-deficient (xeroderma pigmentosum) human cells by employing a novel technique of local ultraviolet irradiation combined with fluorescent antibody labeling. The damage-recognition complex XPC (613208)-HR23B (600062) appeared to be essential for the recruitment of all subsequent NER factors in the preincision complex, including transcription repair factor TFIIH (see 189972). Volker et al. (2001) found that XPA associates relatively late, is required for anchoring of ERCC1-XPF, and may be essential for activation of the endonuclease activity of XPG (133530). These findings identified XPC as the earliest known NER factor in the reaction mechanism, gave insight into the order of subsequent NER components, provided evidence for a dual role of XPA, and supported a concept of sequential assembly of repair proteins at the site of damage rather than a preassembled repairosome.

Repair of double-strand breaks in DNA via the Fanconi anemia (FA; 227650) pathway requires the monoubiquitination of FANCD2 (227646), leading to the accumulation of ubiquitinated FANCD2 at sites of DNA damage. Using normal human fibroblasts depleted of ERCC1 via small interfering RNA and fibroblasts from FA patients, McCabe et al. (2008) showed that ERCC1 was required for both monoubiquitination of FANCD2 and the accumulation of ubiquitinated FANCD2 at sites of DNA damage. ERCC1 was required for FANCD2 foci formation following DNA crosslinking, which can be repaired following the formation of a double-strand break, and on stalled replication forks, which include double-strand breaks. McCabe et al. (2008) concluded that ERCC1 is not required for the formation of double-strand breaks but is required for the activation of FANCD2 for their repair.

By coimmunoprecipitation and yeast 2-hybrid analyses, Perez-Oliva et al. (2015) found that the N-terminal 61 amino acids of human USP45 (618439) interacted with ERCC1. USP45 deubiquitylated ERCC1 both in vitro and in vivo, and association of USP45 with ERCC1 was required for ERCC1 deubiquitylation. USP45 promoted survival of U2OS osteosarcoma cells exposed to DNA-damaging agents and induced DNA damage responses controlled by the ERCC1-XPF endonuclease. USP45 exerted its effects not by stabilizing ERCC1 expression, but by regulating recruitment of ERCC1 to DNA damage sites. USP45 localized to DNA lesions resulting from DNA-damaging agents and controlled repair. Live-cell fluorescence analysis revealed that recruitment of USP45 to damage sites was rapid, transient, and independent of ERCC1-XPF.


Gene Structure

The ERCC1 gene consists of 10 exons spread over approximately 14 kb (van Duin et al., 1987).


Mapping

To human chromosome 19, Siciliano et al. (1985) assigned 2 genes that complement separate DNA repair mutations in Chinese hamster ovary (CHO) cells. One of them complemented a CHO DNA repair deficiency mutant called UV20; the human locus was called ERCC1 (Thompson et al., 1985). The other CHO repair mutant, called EM9, differed in respect to the agents to which it was sensitive and had greatly increased sister chromatid exchanges (Thompson et al., 1982) as in Bloom syndrome (210900); the human locus was called ERCC2 (126340). Human chromosome 19 is thought to be homologous to hamster 9--both have GPI (172400) and PEPD (613230)--and in CHO cells chromosome 9 is hemizygous. The findings probably indicate that the 2 DNA repair genes are syntenic in the hamster also.

De Wit et al. (1985) also mapped to chromosome 19 a human DNA repair gene that complemented the defect in a repair-defective CHO cell line. ERCC1 was so named for 'excision repair complementing defective repair in Chinese hamster.' De Wit et al. (1985) concluded that this is the same gene as that found by Rubin et al. (1985).

By somatic cell hybridization, Brook et al. (1985) assigned the ERCC1 gene to chromosome 19q13.3-q13.2.

ERCC1 has significant amino acid sequence homology with the yeast excision repair protein RAD10 (van Duin et al., 1986). Another gene involved in DNA repair, XRCC1 (194360), is located in the same region of chromosome 19 (Carrano, 1988). In the course of characterizing ERCC1, Hoeijmakers et al. (1989) found that its 3-prime terminus overlapped the 3-prime end of another gene, designated ASE1 (antisense ERCC1; 107325). This exceptional type of gene overlap was conserved in the mouse and even in the yeast ERCC1 homolog, RAD10, suggesting an important biologic function.

With automated fluorescence-based sequences, Martin-Gallardo et al. (1992) sequenced a total of 116,118 bp derived from 3 cosmids spanning the ERCC1 locus. The assembled sequence analyzed by polymerase chain reaction (PCR) amplification and computer methods totaled 105,831 bp and contained, in addition to the ERCC1 gene, an FOSB protooncogene (164772), a gene encoding a protein phosphatase, and 2 genes of unknown function. The 19q13.3 light-band region had a high average density of 1.4 Alu repeats per kilobase. Martin-Gallardo et al. (1992) estimated that the light bands of the human karyotype could contain as many as 75,000 genes and 1.5 million Alu repeats. By several lines of evidence (Langlois et al., 1982; McKusick, 1991), chromosome 19 appears to be unusually densely populated with genes.

As part of the mapping of multiple probes on chromosome 19 by fluorescence in situ hybridization, Trask et al. (1993) mapped the ERCC1 gene to 19q13.2-q13.3.


Molecular Genetics

In a patient with cerebrooculofacioskeletal syndrome (COFS4; 610758), Jaspers et al. (2007) found compound heterozygous mutations in the ERCC1 gene (Q158X, 126380.0001; F231L, 126380.0002). The patient reported by Jaspers et al. (2007) displayed relatively mild impairment of NER, similar to that seen in XPF cases, but had very severe clinical manifestations, including pre- and postnatal developmental failure and death in early infancy. Patient cells showed moderate hypersensitivity to ultraviolet rays and mitomycin C. This discovery represented a novel complementation group of patients with defective NER. Furthermore, the clinical severity, coupled with a relatively mild repair defect, suggested novel functions for ERCC1. Although ERCC1 was the first mammalian repair gene to be cloned (Westerveld et al., 1984) and targeted in mice (McWhir et al., 1993), no case of an ERCC1 defect was identified until the report of Jaspers et al. (2007), despite exhaustive screens in photosensitive patients for 3 decades.

In a patient with severe growth and skeletal abnormalities resulting in early death and associated with defective NER, Kashiyama et al. (2013) identified homozygosity for the F231L mutation in the ERCC1 gene. Patient cells showed decreased expression of both ERCC1 and ERCC4 (133520).

Imoto et al. (2007) reported a woman (XP202DC) with xeroderma pigmentosum and neurologic features who was compound heterozygous for 2 mutations in the ERCC1 gene (K226X and IVS-26G-A). In addition to sun sensitivity, she developed progressive neurodegeneration with dementia and generalized brain atrophy at age 15 and died at age 37 years. The phenotype was similar to that reported in patients with XPF (278760) due to mutations in the ERCC4 gene (133520). ERCC1 and ERCC4 form a complex with endonuclease activity during a late stage of nucleotide excision repair of DNA.


Animal Model

McWhir et al. (1993) produced mice with defective DNA by targeting the ERCC1 gene in an embryonic stem cell line. Homozygous mutant mice were runted at birth and died before weaning with liver failure. Examination of organs showed polyploidy in perinatal liver, progressing to severe aneuploidy by 3 weeks of age. Elevated levels of p53 (191170) were detected in liver, brain and kidney, supporting the hypothesized role for p53 as a monitor of DNA damage. As pointed out by Cleaver (1994), the ERCC1 gene had not been found in association with any specific human disease and was only indirectly presumed to be essential. The findings of McWhir et al. (1993) may suggest pathologic implications of mutations in this gene in the human.

Niedernhofer et al. (2006) studied Ercc1-deficient mice. Embryonic and early postnatal development was mildly retarded, but growth arrests dramatically in the second week, typically culminating in death by 4 weeks. Ercc1-null mice showed skin, liver, and bone marrow abnormalities similar to those seen in normal aging. Niedernhofer et al. (2006) also identified dystonia and progressive ataxia, renal insufficiency, sarcopenia, kyphosis, and, at the cellular level, premature replicative senescence and sensitivity to oxidative stress--all changes associated with advanced age. The authors noted a striking correlation between the phenotype of Ercc1-null mice and that of human XFE progeroid syndrome (610965). Furthermore, ERCC4 (133520), which is defective in XFE progeroid syndrome, is undetectable in Ercc1-null mouse tissue, indicating destabilization of the ERCC4/ERRC1 complex. Niedernhofer et al. (2006) found that these and other changes correlated with those seen in aged mice and developed a model connecting DNA damage, the growth hormone axis, and aging.

Vermeij et al. (2016) reported that a dietary restriction of 30% tripled the median and maximal remaining life spans of Ercc1 delta/- progeroid mice, strongly retarding numerous aspects of accelerated aging. Mice undergoing dietary restriction retained 50% more neurons and maintained full motor function far beyond the life span of mice fed ad libitum. Ercc5 (133530) -/- mice, another DNA repair-deficient progeroid mouse that models Cockayne syndrome (see 278780), responded similarly. The dietary restriction response in Ercc1 delta/- mice closely resembled the effects of dietary restriction in wildtype animals. Notably, liver tissue from Ercc1 delta/- mice fed ad libitum showed preferential extinction of the expression of long genes, a phenomenon also observed in several tissues aging normally. This is consistent with the accumulation of stochastic, transcription-blocking lesions that affect long genes more than short ones. Dietary restriction largely prevented this declining transcriptional output and reduced the number of gamma-H2AX (601772) DNA damage foci, indicating that dietary restriction preserves genome function by alleviating DNA damage. Vermeij et al. (2016) concluded that their findings established the Ercc1 delta/- mouse as a powerful model organism for health-sustaining interventions, revealed potential for reducing endogenous DNA damage, facilitated a better understanding of the molecular mechanism of dietary restriction, and suggested a role for counterintuitive dietary restriction-like therapy for human progeroid genome instability syndromes and possibly neurodegeneration in general.


ALLELIC VARIANTS 2 Selected Examples):

.0001   CEREBROOCULOFACIOSKELETAL SYNDROME 4

ERCC1, GLN158TER
SNP: rs121913027, ClinVar: RCV000018265

In an infant (165TOR) with a severe disorder compatible with a diagnosis of cerebrooculofacioskeletal syndrome (COFS4; 610758), Jaspers et al. (2007) found compound heterozygosity for 2 mutations in the ERCC1 gene: a C-to-T transition predicted to convert codon gln158 into an amber translational stop signal (CAG to TAG; Q158X), inherited from the mother, and a C-to-G transversion predicted to change phe231 to leucine (F231L; 126380.0002), inherited from the father. The phe231 residue lies within the XPF binding domain of ERCC1 and is fully conserved among mammals and in X. laevis. The allele derived from the mother encoded a truncated polypeptide that lacked the entire C-terminal domain, which is essential for interaction with XPF. Heterodimerization of ERCC1-XPF is required for stability of the complex and for its endonuclease activity. Therefore, the Q158X allele was expected to be functionally null.


.0002   CEREBROOCULOFACIOSKELETAL SYNDROME 4

ERCC1, PHE231LEU
SNP: rs121913028, gnomAD: rs121913028, ClinVar: RCV000018266, RCV000252117

For discussion of the phe231-to-leu (F231L) mutation in the ERCC1 gene that was found in compound heterozygous state in a patient with cerebrooculofacioskeletal syndrome (COFS4; 610758) by Jaspers et al. (2007), see 126380.0001.

In a girl (CS20LO), born of unrelated parents, with facial and skeletal abnormalities (610758), Kashiyama et al. (2013) identified a homozygous 693C-G transversion in exon 7 of the ERCC1 gene, resulting in a phe231-to-leu substitution in the C-terminal XPF-interacting helix-hairpin-helix domain. The patient had microcephaly, micrognathia, deep-set eyes, multiple contractures, nystagmus, and possible polymicrogyria. She was diagnosed as having Cockayne syndrome on the basis of impaired RNA synthesis after UV radiation, indicating a defect in TC-NER. Patient cells also showed a decrease in unscheduled DNA synthesis, indicating a defect in global genome NER (GG-NER). In vitro cellular expression studies showed that the F231L mutation did not alter binding to ERCC4 (133520) or to TFIIH (see 189972) and that overexpression of the mutant protein was able to restore NER activity in the patient's cells. However, patient cells showed very low expression of the mutant allele (50-fold less than control), suggesting that the ERCC1-null phenotype in this patient was due to attenuated mRNA expression. Kashiyama et al. (2013) noted that the patient reported by Jaspers et al. (2007) had clinical features that overlapped with Cockayne syndrome.


See Also:

Hoeijmakers (1987); Kondo et al. (1989); Sijbers et al. (1998); van Duin et al. (1988)

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Contributors:
Bao Lige - updated : 05/20/2019
Ada Hamosh - updated : 09/28/2016
Cassandra L. Kniffin - updated : 6/20/2013
Patricia A. Hartz - updated : 6/29/2009
Ada Hamosh - updated : 4/20/2007
Victor A. McKusick - updated : 2/8/2007
Stylianos E. Antonarakis - updated : 8/3/2001
Ada Hamosh - updated : 5/6/1999
Ada Hamosh - updated : 5/5/1999
Jennifer P. Macke - updated : 6/6/1997

Creation Date:
Victor A. McKusick : 6/4/1986

Edit History:
carol : 09/17/2022
carol : 09/16/2022
carol : 09/06/2022
mgross : 05/20/2019
alopez : 09/28/2016
mcolton : 06/03/2015
carol : 2/9/2015
mcolton : 2/6/2015
mcolton : 2/5/2015
alopez : 7/30/2013
alopez : 7/3/2013
ckniffin : 6/20/2013
carol : 1/26/2010
carol : 1/12/2010
alopez : 7/1/2009
terry : 6/29/2009
terry : 9/19/2007
carol : 7/12/2007
alopez : 4/24/2007
terry : 4/20/2007
alopez : 2/12/2007
terry : 2/8/2007
alopez : 9/30/2003
mgross : 8/3/2001
alopez : 5/7/1999
alopez : 5/6/1999
terry : 5/5/1999
terry : 5/5/1999
psherman : 5/8/1998
mark : 11/11/1997
alopez : 9/10/1997
alopez : 9/8/1997
terry : 7/28/1997
terry : 3/21/1997
carol : 11/17/1995
mimadm : 4/18/1994
carol : 12/9/1993
carol : 2/11/1993
carol : 6/18/1992
carol : 5/18/1992