Gene: gap junction protein, beta 2, 26kDa; GJB2


Gene Symbol: GJB2
OMIM: 121011
Chromosome location: 13q12.11

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Deafness, autosomal recessive 1A || c.139G>T

Phenotype:    Deafness, autosomal recessive 1A
Dna Change:    c.139G>T
Protein Change:    p.Glu47X
Mutation Type:    Substitution
Mutation Effect:    Nonsense
Location:    exon 2
Transcript:    NM_004004.5

PopulationEthnic GroupRegionMutation FrquencyCoalescence TimeReference
TunisiaNAGafsa, Sfax and Sidi Bouzid5 families/25 unrelated familiesNABen Said M et al., 2012Ben Said M, Dhouib H, BenZina Z, Ghorbel A, Moreno F, Masmoudi S, Ayadi H, Hmani-Aifa M, . Segregation of a new mutation in SLC26A4 and p.E47X mutation in GJB2 within a consanguineous Tunisian family affected with Pendred syndrome.. Int. J. Pediatr. Otorhinolaryngol.. 2012; 76(6):832-6

Deafness, autosomal recessive 1A || c.35delG

Phenotype:    Deafness, autosomal recessive 1A
Dna Change:    c.35delG
Protein Change:    p.Gly12ValfsX2
Mutation Type:    Deletion
Mutation Effect:    Frameshift
Location:    exon 2
Transcript:    NM_004004.5

PopulationEthnic GroupRegionMutation FrquencyCoalescence TimeReference
EgyptNANA24 out of 222 chromosomes (10.8%)NASnoeckx RL et al., 2005Snoeckx RL, Hassan DM, Kamal NM, Van Den Bogaert K, Van Camp G, . Mutation analysis of the GJB2 (connexin 26) gene in Egypt.. Hum. Mutat.. 2005; 26(1):60-1
GreeceNANAcarrier frequency of 3.5%NAKokotas H et al., 2008Kokotas H, Van Laer L, Grigoriadou M, Iliadou V, Economides J, Pomoni S, Pampanos A, Eleftheriades N, Ferekidou E, Korres S, Giannoulia-Karantana A, Van Camp G, Petersen MB, . Strong linkage disequilibrium for the frequent GJB2 35delG mutation in the Greek population.. Am. J. Med. Genet. A. 2008; 146(22):2879-84
GreeceNANAallele frequency was 42.2% among familial cases and 30.6% among sporadic casesNAPampanos A et al., 2002Pampanos A, Economides J, Iliadou V, Neou P, Leotsakos P, Voyiatzis N, Eleftheriades N, Tsakanikos M, Antoniadi T, Hatzaki A, Konstantopoulou I, Yannoukakos D, Gronskov K, Brondum-Nielsen K, Grigoriadou M, Gyftodimou J, Iliades T, Skevas A, Petersen MB, . Prevalence of GJB2 mutations in prelingual deafness in the Greek population.. Int. J. Pediatr. Otorhinolaryngol.. 2002; 65(2):101-8
ItalyNANA92% (risk allele frequency)NAEstivill X et al., 1998Estivill X, Fortina P, Surrey S, Rabionet R, Melchionda S, D'Agruma L, Mansfield E, Rappaport E, Govea N, Milà M, Zelante L, Gasparini P, . Connexin-26 mutations in sporadic and inherited sensorineural deafness.. Lancet. 1998; 351(9100):394-8
LebanonMuslims, Christians, and DruzeNAallele frequency among familial cases was 94%NAMustapha M et al., 2001Mustapha M, Salem N, Delague V, Chouery E, Ghassibeh M, Rai M, Loiselet J, Petit C, Mégarbané A, . Autosomal recessive non-syndromic hearing loss in the Lebanese population: prevalence of the 30delG mutation and report of two novel mutations in the connexin 26 (GJB2) gene.. J. Med. Genet.. 2001; 38(10):E36
MoroccoNANAcarrier frequencies estimated between 2-4%135 generations or approximately 2700 years oldAbidi O et al., 2008Abidi O, Boulouiz R, Nahili H, Imken L, Rouba H, Chafik A, Barakat A, . The analysis of three markers flanking GJB2 gene suggests a single origin of the most common 35delG mutation in the Moroccan population.. Biochem. Biophys. Res. Commun.. 2008; 377(3):971-4
MoroccoNANA6 patients/12 unrelated patients3000 yearsBelguith H et al., 2005Belguith H, Hajji S, Salem N, Charfeddine I, Lahmar I, Amor MB, Ouldim K, Chouery E, Driss N, Drira M, Mégarbané A, Rebai A, Sefiani A, Masmoudi S, Ayadi H, . Analysis of GJB2 mutation: evidence for a Mediterranean ancestor for the 35delG mutation.. Clin. Genet.. 2005; 68(2):188-9
MoroccoNANAallele frequency was 31.58% among familial cases and 20.51% among sporadic casesNAGazzaz B et al., 2005Gazzaz B, Weil D, Raïs L, Akhyat O, Azeddoug H, Nadifi S, . Autosomal recessive and sporadic deafness in Morocco: high frequency of the 35delG GJB2 mutation and absence of the 342-kb GJB6 variant.. Hear. Res.. 2005; 210(1):80-4
SpainNANA63% (risk allele frequency)NAEstivill X et al., 1998Estivill X, Fortina P, Surrey S, Rabionet R, Melchionda S, D'Agruma L, Mansfield E, Rappaport E, Govea N, Milà M, Zelante L, Gasparini P, . Connexin-26 mutations in sporadic and inherited sensorineural deafness.. Lancet. 1998; 351(9100):394-8
TunisiaNANAcarrier prevalence of 1.3%NAMasmoudi S et al., 2000Masmoudi S, Elgaied-Boulila A, Kassab I, Ben Arab S, Blanchard S, Bouzouita JE, Drira M, Kassab A, Hachicha S, Petit C, Ayadi H, . Determination of the frequency of connexin26 mutations in inherited sensorineural deafness and carrier rates in the Tunisian population using DGGE.. J. Med. Genet.. 2000; 37(11):E39
TunisiaNANA16 patients/70 unrelated patients3000 yearsBelguith H et al., 2005Belguith H, Hajji S, Salem N, Charfeddine I, Lahmar I, Amor MB, Ouldim K, Chouery E, Driss N, Drira M, Mégarbané A, Rebai A, Sefiani A, Masmoudi S, Ayadi H, . Analysis of GJB2 mutation: evidence for a Mediterranean ancestor for the 35delG mutation.. Clin. Genet.. 2005; 68(2):188-9
TurkeyNANAcarrier rate of 1.78%NATekin M et al., 2001Tekin M, Akar N, Cin S, Blanton SH, Xia XJ, Liu XZ, Nance WE, Pandya A, . Connexin 26 (GJB2) mutations in the Turkish population: implications for the origin and high frequency of the 35delG mutation in Caucasians.. Hum. Genet.. 2001; 108(5):385-9
TurkeyNANA73.6% (Risk Allele Frequency)NAUyguner O et al., 2003Uyguner O, Emiroglu M, Uzumcu A, Hafiz G, Ghanbari A, Baserer N, Yuksel-Apak M, Wollnik B, . Frequencies of gap- and tight-junction mutations in Turkish families with autosomal-recessive non-syndromic hearing loss.. Clin. Genet.. 2003; 64(1):65-9

Deafness, autosomal recessive 1A || c.71G>A

Phenotype:    Deafness, autosomal recessive 1A
Dna Change:    c.71G>A
Protein Change:    p.Trp24X
Mutation Type:    Substitution
Mutation Effect:    Nonsense
Location:    exon 2
Transcript:    NM_004004.5

PopulationEthnic GroupRegionMutation FrquencyCoalescence TimeReference
SpainGypsyNA79% of the DFNB1 allelesNAAlvarez A et al., 2005Alvarez A, del Castillo I, Villamar M, Aguirre LA, González-Neira A, López-Nevot A, Moreno-Pelayo MA, Moreno F, . High prevalence of the W24X mutation in the gene encoding connexin-26 (GJB2) in Spanish Romani (gypsies) with autosomal recessive non-syndromic hearing loss.. Am. J. Med. Genet. A. 2005; 137(3):255-8

References

Abidi O, Boulouiz R, Nahili H, Imken L, Rouba H, Chafik A, Barakat A, The analysis of three markers flanking GJB2 gene suggests a single origin of the most common 35delG mutation in the Moroccan population.Biochem. Biophys. Res. Commun.. 2008; 377(3):971-4

Alvarez A, del Castillo I, Villamar M, Aguirre LA, González-Neira A, López-Nevot A, Moreno-Pelayo MA, Moreno F, High prevalence of the W24X mutation in the gene encoding connexin-26 (GJB2) in Spanish Romani (gypsies) with autosomal recessive non-syndromic hearing loss.Am. J. Med. Genet. A. 2005; 137(3):255-8

Belguith H, Hajji S, Salem N, Charfeddine I, Lahmar I, Amor MB, Ouldim K, Chouery E, Driss N, Drira M, Mégarbané A, Rebai A, Sefiani A, Masmoudi S, Ayadi H, Analysis of GJB2 mutation: evidence for a Mediterranean ancestor for the 35delG mutation.Clin. Genet.. 2005; 68(2):188-9

Ben Said M, Dhouib H, BenZina Z, Ghorbel A, Moreno F, Masmoudi S, Ayadi H, Hmani-Aifa M, Segregation of a new mutation in SLC26A4 and p.E47X mutation in GJB2 within a consanguineous Tunisian family affected with Pendred syndrome.Int. J. Pediatr. Otorhinolaryngol.. 2012; 76(6):832-6

Estivill X, Fortina P, Surrey S, Rabionet R, Melchionda S, D'Agruma L, Mansfield E, Rappaport E, Govea N, Milà M, Zelante L, Gasparini P, Connexin-26 mutations in sporadic and inherited sensorineural deafness.Lancet. 1998; 351(9100):394-8

Gazzaz B, Weil D, Raïs L, Akhyat O, Azeddoug H, Nadifi S, Autosomal recessive and sporadic deafness in Morocco: high frequency of the 35delG GJB2 mutation and absence of the 342-kb GJB6 variant.Hear. Res.. 2005; 210(1):80-4

Kokotas H, Van Laer L, Grigoriadou M, Iliadou V, Economides J, Pomoni S, Pampanos A, Eleftheriades N, Ferekidou E, Korres S, Giannoulia-Karantana A, Van Camp G, Petersen MB, Strong linkage disequilibrium for the frequent GJB2 35delG mutation in the Greek population.Am. J. Med. Genet. A. 2008; 146(22):2879-84

Masmoudi S, Elgaied-Boulila A, Kassab I, Ben Arab S, Blanchard S, Bouzouita JE, Drira M, Kassab A, Hachicha S, Petit C, Ayadi H, Determination of the frequency of connexin26 mutations in inherited sensorineural deafness and carrier rates in the Tunisian population using DGGE.J. Med. Genet.. 2000; 37(11):E39

Mustapha M, Salem N, Delague V, Chouery E, Ghassibeh M, Rai M, Loiselet J, Petit C, Mégarbané A, Autosomal recessive non-syndromic hearing loss in the Lebanese population: prevalence of the 30delG mutation and report of two novel mutations in the connexin 26 (GJB2) gene.J. Med. Genet.. 2001; 38(10):E36

Pampanos A, Economides J, Iliadou V, Neou P, Leotsakos P, Voyiatzis N, Eleftheriades N, Tsakanikos M, Antoniadi T, Hatzaki A, Konstantopoulou I, Yannoukakos D, Gronskov K, Brondum-Nielsen K, Grigoriadou M, Gyftodimou J, Iliades T, Skevas A, Petersen MB, Prevalence of GJB2 mutations in prelingual deafness in the Greek population.Int. J. Pediatr. Otorhinolaryngol.. 2002; 65(2):101-8

Snoeckx RL, Hassan DM, Kamal NM, Van Den Bogaert K, Van Camp G, Mutation analysis of the GJB2 (connexin 26) gene in Egypt.Hum. Mutat.. 2005; 26(1):60-1

Tekin M, Akar N, Cin S, Blanton SH, Xia XJ, Liu XZ, Nance WE, Pandya A, Connexin 26 (GJB2) mutations in the Turkish population: implications for the origin and high frequency of the 35delG mutation in Caucasians.Hum. Genet.. 2001; 108(5):385-9

Uyguner O, Emiroglu M, Uzumcu A, Hafiz G, Ghanbari A, Baserer N, Yuksel-Apak M, Wollnik B, Frequencies of gap- and tight-junction mutations in Turkish families with autosomal-recessive non-syndromic hearing loss.Clin. Genet.. 2003; 64(1):65-9