3 previously reported
Case#: Xin_Patient_6, sex not mentioned, age 8 at onset, Swedish nationality
CasePresentingHPOs: HP:0004302 (Functional motor deficit), HP:0000572 (Visual loss), HP:0001250 (Seizure), HP:0001268 (Mental deterioration), HP:0003621 (Juvenile onset), HP:0003208 (Fingerprint intracellular accumulation of autofluorescent lipopigment storage material), HP:0003205 (Curvilinear intracellular accumulation of autofluorescent lipopigment storage material)
CaseHPOFreeText: Motor difficulty was the phenotype at presentation (age 8). Seizures (age 8), Visual loss (age 12), and Cognitive regression (age 11) subsequently developed. Curvilinear inclusions were observed in the skin specifically.
CaseNotHPOs: N/A
CaseNotHPOFreeText: N/A
CasePreviousTesting: Previous testing for mutations in the CLN1, CLN2, CLN3, CLN6, and CLN8 had already occurred, using PCR amplification and Sanger sequencing to exclude the possibility of variants in the exons and surrounding noncoding regions. Genome-wide analysis methods were not used, as NCL had already been diagnosed based on clinical phenotypes.
CaseMethod1: PCR amplification of the coding and surrounding non-coding regions of each gene, followed by bidirectional Sanger sequencing.
CaseMethod2: as mentioned
CaseGenotypingMethod: CLN5 genotyping was performed by PCR amplification of the four exons and surrounding non-coding regions was performed, followed by bi-directional Sanger sequencing. Synthetic multiplex ligation-dependent probe amplification (MLPA) was then used to calculate average gene dosage ratio for each ratio, in order to detect large deletions.
Variant: The patient harbors the NM_006493.4(CLN5):c.78G>A (p.Trp26Ter) and NM_006493.4(CLN5):c.522dup (p.Trp175LeufsTer30) variants, as well as the likely benign NM_006493.4(CLN5):c.381T>G (p.Thr127=) variant.
ClinVar: 2565, 56543, 128783
gnomAD: Maximum allele frequency for NM_006493.4(CLN5):c.78G>A (p.Trp26Ter) is 0.00005132 (in the European non-Finnish population, no homozygotes). https://gnomad.broadinstitute.org/variant/13-77566311-G-A Maximum allele frequency for NM_006493.4(CLN5):c.522dup (p.Trp175fs) is 0.00007033 (in the European non-Finnish population, no homozygotes). Maximum allele frequency for the NM_006493.4(CLN5):c.381T>G (p.Thr127=) variant is 0.06570 (in the East Asian population, 48 homozygotes) https://gnomad.broadinstitute.org/variant/13-77570078-T-G
VariantEvidence: The NM_006493.4(CLN5):c.78G>A (p.Trp26Ter) nonsense variant is likely to be subject to nonsense mediated decay. The NM_006493.4(CLN5):c.522dup (p.Trp175fs) frameshift variant is predicted to truncate ~51% of the protein. On the other hand, the synonymous NM_006493.4(CLN5):c.381T>G (p.Thr127=) variant appears unlikely to have a gene impact.
CaseAddInfo: Parents do not appear to have been genotyped, so it is unclear whether the two variants with predicted gene impact have been shown or simply assumed to be in trans. The same is true for the benign, synonymous variant.
CasePMIDs: N/A