Locus JBS CBL

Disease ID
JBS
Gene ID
CBL
Updated
Aug 24, 2026
v2.26.0
Other gene loci
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Disease

Name Jacobsen syndrome (FRAX11B fragile site)
Inheritance
Description
A multiple congenital anomaly/intellectual disability contiguous gene syndrome caused by partial deletion of the long arm of chromosome 11 .
Prevalence
1/100,000 births; female/male ratio 2:1 . Found across ancestries/ethnicities .
Age of Onset Age of OnsetYears0  0
Condition at birth.
HPO Terms
HP:0000003 Multicystic kidney dysplasiaHP:0000023 Inguinal herniaHP:0000028 CryptorchidismHP:0000047 HypospadiasHP:0000060 Clitoral hypoplasiaHP:0000066 Labial hypoplasiaHP:0000126 HydronephrosisHP:0000174 Abnormal palate morphologyHP:0000238 HydrocephalusHP:0000243 TrigonocephalyHP:0000252 MicrocephalyHP:0000256 MacrocephalyHP:0000286 EpicanthusHP:0000316 HypertelorismHP:0000319 Smooth philtrumHP:0000324 Facial asymmetryHP:0000343 Long philtrumHP:0000347 MicrognathiaHP:0000348 High foreheadHP:0000358 Posteriorly rotated earsHP:0000369 Low-set earsHP:0000431 Wide nasal bridgeHP:0000463 Anteverted naresHP:0000465 Webbed neckHP:0000470 Short neckHP:0000482 MicrocorneaHP:0000486 StrabismusHP:0000494 Downslanted palpebral fissuresHP:0000499 Abnormal eyelash morphologyHP:0000506 TelecanthusHP:0000508 PtosisHP:0000518 CataractHP:0000567 Chorioretinal colobomaHP:0000568 MicrophthalmiaHP:0000579 Nasolacrimal duct obstructionHP:0000612 Iris colobomaHP:0000625 Eyelid colobomaHP:0000646 AmblyopiaHP:0000648 Optic atrophyHP:0000656 EctropionHP:0000767 Pectus excavatumHP:0000921 Missing ribsHP:0000964 Eczematoid dermatitisHP:0001104 Macular hypoplasiaHP:0001156 BrachydactylyHP:0001161 Hand polydactylyHP:0001249 Intellectual disabilityHP:0001250 SeizureHP:0001257 SpasticityHP:0001263 Global developmental delayHP:0001274 Agenesis of corpus callosumHP:0001290 Generalized hypotoniaHP:0001302 PachygyriaHP:0001360 HoloprosencephalyHP:0001371 Flexion contractureHP:0001508 Failure to thriveHP:0001510 Growth delayHP:0001511 Intrauterine growth retardationHP:0001622 Premature birthHP:0001629 Ventricular septal defectHP:0001631 Atrial septal defectHP:0001650 Aortic valve stenosisHP:0001680 Coarctation of aortaHP:0001734 Annular pancreasHP:0001763 Pes planusHP:0001770 Toe syndactylyHP:0001831 Short toeHP:0001847 Long halluxHP:0001863 Toe clinodactylyHP:0001873 ThrombocytopeniaHP:0001883 TalipesHP:0002007 Frontal bossingHP:0002019 ConstipationHP:0002021 Pyloric stenosisHP:0002059 Cerebral atrophyHP:0002119 VentriculomegalyHP:0002205 Recurrent respiratory infectionsHP:0002247 Duodenal atresiaHP:0002414 Spina bifidaHP:0002566 Intestinal malrotationHP:0002650 ScoliosisHP:0002827 Hip dislocationHP:0003196 Short noseHP:0003312 Abnormal vertebral body morphologyHP:0004209 Clinodactyly of the 5th fingerHP:0004322 Short statureHP:0004378 Abnormality of the anusHP:0004383 Hypoplastic left ventricleHP:0004397 Ectopic anusHP:0005280 Depressed nasal bridgeHP:0005469 Flat occiputHP:0005528 Bone marrow hypocellularityHP:0006101 Finger syndactylyHP:0007018 Attention deficit hyperactivity disorderHP:0007302 Bipolar affective disorderHP:0008872 Feeding difficulties in infancyHP:0008947 Floppy infantHP:0009906 Aplasia/Hypoplasia of the earlobesHP:0010059 Broad hallux phalanxHP:0010761 Broad columellaHP:0010806 U-Shaped upper lip vermilionHP:0100753 SchizophreniaHP:0100840 Aplasia/Hypoplasia of the eyebrow
Association
Mendelian

Locus

Details
70% of individuals have 11 repeats , but pathogenic expansion can span hundreds of motifs . The CGG repeat expansion can lead to a fragile site and subsequent deletion of 11q (shown in 2 cases) but total causality is unclear; intermediate alleles are associated with a premutation .
Mechanism
Hypermethylation
DNA hypermethylation/11q deletion in sporadic cases .
Detection
Year
1995
Location in Gene
5' UTR
Gene Strand

Alleles

Ref. Motif
CGG
Ranges BenignIntermediatePathogenicUnits5  7980  100101  300
Benign (ref.)
Benign (gene)
Pathogenic (ref.)
CGG
Pathogen. (gene)
CGG
Unknown (ref.)
Unknown (gene)
Interruption (ref.)
Interrup. (gene)

References

Direct supporting references for info on this page.

1
Ontology Lookup Service (OLS)
mondo:0007838
2
Jacobsen syndrome.
Teresa,Mattina, Concetta Simona,Perrotta, Paul,Grossfeld
Orphanet journal of rare diseases · 2009-03-07
pmid:19267933
4
Association of a chromosome deletion syndrome with a fragile site within the proto-oncogene CBL2.
C,Jones, L,Penny, T,Mattina, S,Yu, E,Baker, L,Voullaire, W Y,Langdon, G R,Sutherland, R I,Richards, A,Tunnacliffe
Nature · 1995-07-13
pmid:7603564
5
Co-localisation of CCG repeats and chromosome deletion breakpoints in Jacobsen syndrome: evidence for a common mechanism of chromosome breakage.
C,Jones, R,Müllenbach, P,Grossfeld, R,Auer, R,Favier, K,Chien, M,James, A,Tunnacliffe, F,Cotter
Human molecular genetics · 2000-05-01
pmid:10767345
6
Sequence composition changes in short tandem repeats: heterogeneity, detection, mechanisms and clinical implications.
Indhu-Shree,Rajan-Babu, Egor,Dolzhenko, Michael A,Eberle, Jan M,Friedman
Nature reviews. Genetics · 2024-03-11
pmid:38467784

Additional Literature

Additional literature related to this locus.

Raw PubMed search results
(All PubMed results returned by searching for this gene, tandem repeats, and disease, in medline format)

CBL Syndrome With Granular Cell Tumor and café au lait macules: Expansion of the Phenotype.
Caitlin N,Harrington, Emily,Kohl, Zainab,Gilitwala, Joyce,Teng, Dawn H,Siegel, Gregory W,Charville, Robert J,Steffner, David A,Stevenson
American journal of medical genetics. Part A · 2026-04-10
pmid:41964119
Genome-wide identification of TaCIPK gene family members in wheat and their roles in host response to Blumeria graminis f. sp. tritici infection.
Xiaoying,Liu, Xueqing,Wang, Chenxiao,Yang, Guangyu,Wang, Baoli,Fan, Yuntao,Shang, Chen,Dang, Chaojie,Xie, Zhenying,Wang
International journal of biological macromolecules · 2023-07-06
pmid:37422244
A high occurrence of acquisition and/or expansion of C-CBL mutant clones in the progression of high-risk myelodysplastic syndrome to acute myeloid leukemia.
Hsiao-Wen,Kao, Masashi,Sanada, Der-Cherng,Liang, Chang-Liang,Lai, En-Hui,Lee, Ming-Chung,Kuo, Tung-Liang,Lin, Yu-Shu,Shih, Jin-Hou,Wu, Chein-Fuang,Huang, Seishi,Ogawa, Lee-Yung,Shih
Neoplasia (New York, N.Y.) · 2011-11-01
pmid:22131879
Expansion of functionally anergic CD21-/low marginal zone-like B cell clones in hepatitis C virus infection-related autoimmunity.
Benjamin,Terrier, Florence,Joly, Thomas,Vazquez, Philippe,Benech, Michelle,Rosenzwajg, Wassila,Carpentier, Marlène,Garrido, Pascale,Ghillani-Dalbin, David,Klatzmann, Patrice,Cacoub, David,Saadoun
Journal of immunology (Baltimore, Md. : 1950) · 2011-11-14
pmid:22084433
The WD40 repeats of FANCL are required for Fanconi anemia core complex assembly.
Allan M,Gurtan, Patricia,Stuckert, Alan D,D'Andrea
The Journal of biological chemistry · 2006-02-10
pmid:16474167