PMID: 39421326 (PMCID: PMC11675205)

Gene: ABCA4

HGNC ID: 34

Case#: Patient 24 (male)

DiseaseAssertion: STGD (Stargardt disease)

FamilyInfo: Caucasian family from Germany. Patient has two siblings carrying the variant but they are not clinically affected according to pedigree information.

CasePresentingHPOs: Decreased central visual acuity (HP:0000545) Macular atrophy (HP:0007754) Retinal flecks (HP:0030638) Abnormal fundus autofluorescence (HP:0030647) Macular degeneration (HP:0007754) Abnormal electroretinogram (HP:0000763)

CaseHPOFreeText: Male patient diagnosed before age 50 with Stargardt disease. Best corrected visual acuity (BCVA) approximately 0.05–0.2. Fundus imaging shows paracentral scotoma, macular atrophy, and hyperfluorescent flecks with sparing of the fovea. Autofluorescence demonstrates hyperreflective spots and patchy lesions with parafoveal involvement.

CaseNotHPOs: None explicitly reported.

CaseNotHPOFreeText: Pattern-like distribution of lesions noted on clinical examination.

Genotyping Method: Whole-exome sequencing (WES) with an in-house RD-associated gene panel including 619 candidate and disease-associated genes.

PreviouslyPublished: No (novel complex deep-intronic allele described in this study).

Variant: c.[1555-5882C>A;1555-5784C>G]

ClinVar: Not reported in ClinVar in the provided information.

CAID: CA272741; CA227172

SupplementalData: Segregation data and functional splicing analysis available in the supplemental data (Table S1, Figure S1) of the article.

PMID: 10612508

Gene: ABCA4

Case#: Patient 2, 46-year-old female

DiseaseAssertion: STGD1

FamilyInfo: One of four affected siblings in a family consistent with autosomal recessive inheritance.

CasePresentingHPOs: HP:0000545 — Decreased visual acuity HP:0007754 — Macular atrophy HP:0030638 — Retinal flecks HP:0000512 — Abnormal fundus morphology

CaseHPOFreeText: Progressive visual decline since age 16. Best-corrected visual acuity 20/400 in both eyes. Fundus examination showed bilateral symmetrical central chorioretinal atrophy (~3 disc diameters) with prominent pigment deposits and numerous yellow flecks in the posterior pole. Fluorescein angiography demonstrated central hypofluorescence with surrounding hyperfluorescence and peripheral dark choroid.

CaseNotHPOs: Not reported

CaseNotHPOFreeText: Not reported

GenotypingMethod: PCR amplification and direct sequencing of ABCA4 after SSCP screening

PreviouslyPublished: Yes

Variant: NM_000350.2:c.2588G>C (p.Gly863Ala) NM_000350.2:c.161G>A (p.Cys54Tyr)

ClinVar: Not reported

CAID: Not reported

SupplementalData: Segregation and sequencing data shown in Figures 1 and 4

Case#: Patient 3, 37-year-old female

PMID: 10612508

DiseaseAssertion: STGD1

FamilyInfo: Affected sibling in autosomal recessive family.

CasePresentingHPOs: HP:0000545 — Decreased visual acuity HP:0007754 — Macular atrophy HP:0030638 — Retinal flecks HP:0000512 — Abnormal fundus morphology

CaseHPOFreeText: Gradual visual decline beginning at age 12. Visual acuity 20/400 in both eyes. Fundus examination revealed bilateral macular atrophy with pigment deposits and numerous yellow flecks in the posterior pole and midperiphery. Fluorescein angiography showed large hypofluorescent regions with surrounding hyperfluorescence and peripheral dark choroid.

CaseNotHPOs: Not reported

CaseNotHPOFreeText: Not reported

GenotypingMethod: PCR and direct sequencing of ABCA4

PreviouslyPublished: Yes

Variant: NM_000350.2:c.2588G>C (p.Gly863Ala) NM_000350.2:c.161G>A (p.Cys54Tyr)

ClinVar: Not reported

CAID: Not reported

SupplementalData: Segregation and sequencing data (Figures 1, 4)