Methods and compositions for the diagnosis of Cornelia de Lange Syndrome
Compositions and methods for the diagnosis of Cornelia de Lange Syndrome are disclosed.
1. A method for diagnosing a human as having an increased risk of developing Cornelia de Lange Syndrome (CdLS) comprising:
a) providing a biological sample from said human comprising a nucleic acid molecule comprising an NIPBL (Nipped-B like) gene wherein said NIPBL gene encodes an NIPBL protein; and
b) detecting in the NIPBL gene of step a) a genetic alteration which alters the length of the NIPBL protein encoded by the NTPBL gene of step a) such that the NIPBL protein encoded by the NIPBL gene of step a) is shorter than a protein consisting of SEQ ID NO: 3;
wherein said genetic alteration in the NIPBL gene of step a) corresponds to an alteration in SEQ ID NO: 2 selected from the group consisting of: deletion of G at position 276, replacement of the nucleotides at positions 325-334 with SEQ ID NO: 121, deletion of CT at positions 868-869, deletion of A at position 1087, insertion of G at position 1672, insertion of C at position 1795, insertion of A at position 2028, deletion of AG at positions 2605-2606, deletion of T at position 2646, deletion of G at position 3095, deletion of TGTCT at positions 3149-3153, deletion of TAGA at positions 3183-3186, deletion of AGAG at positions 3186-3189, insertion of G at position 4095, deletion of AAAAA at positions 4691-4695, deletion of C at position 4693, deletion of AAGAC at positions 7277-7281, deletion of C at position 7336, deletion of G at position 7557, deletion of C at position 7906, and insertion of G at position 7951;
or wherein said genetic alteration in the NIPBL gene of step a) is a nonsense mutation creating a stop codon at a position corresponding to the codon encoding an amino acid in the NIPBL protein of SEQ ID NO: 3 selected from the group consisting of: Arg at position 479, Arg at position 797, Arg at position 832, Glu at position 977, Ser at position 1024, Ser at position 1398, Ser at position 1459, Arg at position 1536, Arg at position 1723, and Arg at position 1758; and
wherein said genetic alteration in the NIPBL gene of step a) is correlated with an increased risk of developing CdLS in said human.
2. The method according to claim 1 , wherein said biological sample is selected from the group consisting of blood, saliva, amniotic fluid, embryonic tissue and tissue.
3. The method according to claim 2 , wherein said biological sample is blood.
4. The method of claim 1 , wherein the genetic alteration detected in step b) is in exon 10 of the NIPBL gene.
5. The method according to claim 1 , wherein step b) is performed by a method selected from the group consisting of direct sequencing, conformation sensitive gel electrophoresis, single strand polymorphism assay, restriction fragment length polymorphism assay, ligase chain reaction, enzymatic cleavage and southern hybridization.
6. The method according to claim 5 , wherein step b) is performed by direct sequencing.
7. The method according to claim 5 , wherein step b) is performed by conformation sensitive gel electrophoresis.
8. The method according to claim 1 , wherein said nucleic acid molecule comprising the NIPBL gene is a deoxyribonucleic acid.
9. The method according to claim 1 , wherein said nucleic acid molecule comprising the NIPBL gene is a messenger ribonucleic acid.
10. The method according to claim 1 , further comprising isolating the protein product encoded by said NIPBL gene of step a).
11. The method of claim 1 , further comprising isolating cells from said human and assessing said cells for the presence or absence of precocious sister chromatid separation (PSOS).
12. The method as claimed in claim 1 , wherein said genetic alteration has been previously identified in a patient having CdLS.
13. The method as claimed in claim 1 , wherein said human is an infant, and said method further comprises performance of genotype-phenotype correlation analysis.
14. The method of claim 13 , wherein the phenotype for the genotype-phenotype correlation is selected from the group consisting of limb reduction, developmental delay, and growth retardation.