Collect whole blood in a purple top (EDTA) tube (preferred). Extracted DNA is also acceptable.
Unacceptable Conditions
Heparinized specimens, severely hemolyzed specimens, frozen, clotted or possibly commingled specimens, blood in non-sterile or leaky containers, mislabeled or inappropriately labeled specimens.
Storage/Transport Temperature
For CHOP Phlebotomy: Samples can be collected throughout the week. Samples collected on weekends or holidays are held in Central Labs and sent to the Genomic Diagnostic Lab the following business day.
For External Clients: Refrigerate sample until shipment. Send the sample at room temperature with overnight delivery for receipt Monday through Friday, optimally within 24 hours of collection.
Please contact the lab (267-426-1447) with questions regarding non-blood specimens.
Volume Required
5 ml whole blood or 1 ug DNA
Minimum Required
3 ml
Phlebotomy Draw
Yes
Clinical Features
The primary clinical signs of BPES are blepharophimosis, ptosis and epicanthus inversus, although a variety of ocular and non-ocular features have been described. The association with amenorrhoea, infertility, and elevated gonadotropin levels in females has been noted. Based on the phenotype, two different types of BPES have been described. In BPES type I, eyelid malformations are associated with premature ovarian failure (POF), whereas in BPES type II, only the eyelid defect is observed. Mutations in the FOXL2 gene, a putative forkhead transcription factor gene, have been shown to cause both types of BPES.
Performing Lab
Division of Genomic Diagnostics
Performed
Mon - Fri 9:00am to 4:00pm
Reported
21 days
Detection Rate
Point mutations in the FOXL2 gene are detected in 70% of cases with BPES.The analytical sensitivity for sequencing is close to 100%.
Utility
The clinical utility of the assay is in confirming the clinical diagnosis of BPES in these patients, assessing the risk to other first degree relatives and genotyping at risk family members.
We offer DNA sequence analysis and deletion/duplication testing of the entire coding region of the FOXL2 gene. These tests can be ordered as a panel or individually. PCR amplification and sequence analysis is performed on the coding exon including splice junctions. The patient's gene sequence is compared to a reference sequence. Sequence variants are classified as mutations, variants of unknown significance or benign variants unrelated to disease. Variants of unknown significance may warrant further studies in the patient and other family members. Mutations in promoters, deep intronic regions and other regulatory regions will not be identified with this assay.
Molecular Testing Notes
The FOXL2 gene is located on chromosome 3q23. The inheritance pattern is autosomal dominant. Intragenic point mutations have been found in about 70% of BPES patients. They include premature stop codons, missense mutations, expansions of the region encoding the poly alanine domain and frameshift mutations leading to a shorter or longer protein. Thirty three percent of the point mutations detected in the coding region result in an expansion of the poly alanine tract of FOXL1, and are mainly responsible for BPES type II. Genomic rearrangements have been found in 16% of patients, including microdeletions encompassing FOXL2 (10%), translocations and deletions involving long-range non-genic conserved sequences far upstream and downstream of FOXL2 (6%). There is considerable intra- and interfamilial phenotypic variability with these mutations (ie., both BPES types can be caused by the same mutation).
CPT Codes
81479
Collection
Collect
Collect whole blood in a purple top (EDTA) tube (preferred). Extracted DNA is also acceptable.
Unacceptable Conditions
Heparinized specimens, severely hemolyzed specimens, frozen, clotted or possibly commingled specimens, blood in non-sterile or leaky containers, mislabeled or inappropriately labeled specimens.
Storage/Transport Temperature
For CHOP Phlebotomy: Samples can be collected throughout the week. Samples collected on weekends or holidays are held in Central Labs and sent to the Genomic Diagnostic Lab the following business day.
For External Clients: Refrigerate sample until shipment. Send the sample at room temperature with overnight delivery for receipt Monday through Friday, optimally within 24 hours of collection.
Please contact the lab (267-426-1447) with questions regarding non-blood specimens.
Volume Required
5 ml whole blood or 1 ug DNA
Minimum Required
3 ml
Phlebotomy Draw
Yes
Ordering
Clinical Features
The primary clinical signs of BPES are blepharophimosis, ptosis and epicanthus inversus, although a variety of ocular and non-ocular features have been described. The association with amenorrhoea, infertility, and elevated gonadotropin levels in females has been noted. Based on the phenotype, two different types of BPES have been described. In BPES type I, eyelid malformations are associated with premature ovarian failure (POF), whereas in BPES type II, only the eyelid defect is observed. Mutations in the FOXL2 gene, a putative forkhead transcription factor gene, have been shown to cause both types of BPES.
Performing Lab
Division of Genomic Diagnostics
Performed
Mon - Fri 9:00am to 4:00pm
Reported
21 days
Detection Rate
Point mutations in the FOXL2 gene are detected in 70% of cases with BPES.The analytical sensitivity for sequencing is close to 100%.
Utility
The clinical utility of the assay is in confirming the clinical diagnosis of BPES in these patients, assessing the risk to other first degree relatives and genotyping at risk family members.
We offer DNA sequence analysis and deletion/duplication testing of the entire coding region of the FOXL2 gene. These tests can be ordered as a panel or individually. PCR amplification and sequence analysis is performed on the coding exon including splice junctions. The patient's gene sequence is compared to a reference sequence. Sequence variants are classified as mutations, variants of unknown significance or benign variants unrelated to disease. Variants of unknown significance may warrant further studies in the patient and other family members. Mutations in promoters, deep intronic regions and other regulatory regions will not be identified with this assay.
Molecular Testing Notes
The FOXL2 gene is located on chromosome 3q23. The inheritance pattern is autosomal dominant. Intragenic point mutations have been found in about 70% of BPES patients. They include premature stop codons, missense mutations, expansions of the region encoding the poly alanine domain and frameshift mutations leading to a shorter or longer protein. Thirty three percent of the point mutations detected in the coding region result in an expansion of the poly alanine tract of FOXL1, and are mainly responsible for BPES type II. Genomic rearrangements have been found in 16% of patients, including microdeletions encompassing FOXL2 (10%), translocations and deletions involving long-range non-genic conserved sequences far upstream and downstream of FOXL2 (6%). There is considerable intra- and interfamilial phenotypic variability with these mutations (ie., both BPES types can be caused by the same mutation).
