Introduction
Patients and methods
Patients
Alzheimer’s disease | FTD | Atypical dementias | ||||
---|---|---|---|---|---|---|
Number of familial cases (mean AOO ± SD) | Number of sporadic cases (mean AOO ± SD) | Number of familial cases (mean AOO ± SD) | Number of sporadic cases (mean AOO ± SD) | Number of familial cases (mean AOO ± SD) | Number of sporadic cases (mean AOO ± SD) | |
Female | 15 (55.7 ± 7.7) | 18 (54.2 ± 14.2) | 12 (54.9 ± 5.6) | 13 (57.1 ± 6.1) | 7 (57.9 ± 5.43) | 4 (53.3 ± 9.4) |
Male | 6 (58.2 ± 26.4) | 10 (52.6 ± 18.7) | 5 (57.4 ± 2.4) | 19 (54.49 ± 6.03) | 3 (58.0 ± 1.73) | 8 (58.9 ± 4.8) |
Molecular genetic analysis
Bioinformatics analysis
Results
The identified monogenic dementias
C9ORF72 hexanucleotide repeat expansion
Patient ID | Form | AOO | Sex | Symptoms | Clinical diagnosis |
---|---|---|---|---|---|
P3 | F | 56 | f | Memory impairment, apathia, depression, executive disabilities, hallucination, urinary incontinence | FTD |
P15 | F | 56 | f | Memory deficit, aphasia, paraphasia | FTD |
P17 | S | 50 | m | Memory impairment, aphasia, dyscalculia, delusion | FTD |
P24 | S | 40 | f | Memory deficit, anxiety, depression, hallucination | FTD |
P32 | F | 55 | f | Memory deficit, anxiety, depression, | AD |
P45 | F | 62 | f | Severe cognitive impairment, parkinsonism, hallucination | FTD |
P80 | F | 60 | m | muscle weakness, dysphagia, spasticity, pyramidal signs, cognitive impairment, aphasia | FTD/MND |
P107 | F | 58 | f | Cognitive impairment, apathia | FTD |
Rare damaging variants in AD- or FTD-associated genes
Patient ID | Form | AOO | Sex | Symptoms | Gene | Variant ID | Zygosity | Clinical significance | ACMG classification | MAF (non-neuro) | Patients | Controls | Reference |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
P59 | F | 40 | f | Severe short-term memory impairment; serious language impairment, epileptic seizure, myoclonus-like jerks, hypokinesis | APP | p.V717F c.2149G > T rs63750264 | het | P | P | - | 1/120 | 0/137 | [14] |
P11 | S | 60 | f | Behavioral changes; speech deterioration; severe aphasia; rigidity; sever dysphagia | GRN | c.708 + 1G > A rs63749817 | het | P/LP | P | - | 1/120 | 0/137 | [15] |
P117 | S | 49 | m | Behavioral changes, aphasia | GRN | p.Ser226TrpfsTer28 c.675_676delCA rs63751085 | het | P | P | - | 1/120 | 0/137 | [16] |
P10 | S | 58 | f | Aphasia, apathy, severe cognitive impairment, echolalia | GRN | c.264 + 2 T > C | het | D | LP | - | 2/120 | 0/137 | [15] |
P46 | F | 59 | m | Aphasia, apathy, severe cognitive impairment | |||||||||
P27 | F | 52 | f | Short-term memory impairment, anxiety, amnestic, and executive disabilities | PSEN1 | p.V89L c.265G > C | het | D | LP | - | 1/120 | 0/137 | [17] |
P31 | S | 39 | f | Memory impairment, disorientation, hallucination, psychotic sessions, conversion, mixed dissociative disorder, myoclonus, impaired speech, and apraxia | PSEN1 | p.G206S c.616G > A rs63750569 | het | D | LP | - | 1/120 | 0/137 | [44] |
P111 | F | 45 | f | Spastic paraparesis, dysarthria, dysphagia, severe cognitive decline, and progressive loss of speech | PSEN1 | p.L166R c.497 T > G rs63750265 | het | D | LP | - | 1/120 | 0/137 | [27] |
P56 | S | 52 | m | Memory impairment, progressive dysphagia, apraxia, tetrapyramidal signs, spasticity, and urinary incontinence | CSF1R | c.2646_2654 + 6del | het | D | P | - | 1/54 | 0/137 | - |
P112 | F | 29 | m | learning difficulty, concentration problems, gait disturbance, speech deterioration | PRNP | 7- OPRI | het | D | P | < 0.01 | 1/120 | 0/137 | [22] |
P14 | S | 51 | m | Behavioral changes, memory deficit, mixed aphasia, apathy, epileptic seizures, rigor, resting tremor, urinary incontinence | TREM2 | p.R47C c.139C > T rs753325601 | comp. het | D | VUS | < 0.01 | 1/54 | 0/137 | [21] |
p.A105Rfs*84 c.313delG rs386834141 | P | P | < 0.01 | 1/54 | 0/137 | [20] |
Monogenic dementias associated with other neurodegenerative disorders
Genetic risk factors associated with AD
Patient ID | Form | AOO | Sex | Symptoms | Gene | Variant ID | Zygosity | Clinical significance | ACMG classification | MAF (non-neuro) | Patients | Controls | Reference |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
P45 | F | 62 | f | Severe cognitive impairment | TREM2 | p.R47H c.140G > A rs75932628 | B | RF | VUS | 0.025 | 2/54 | 0/137 | [34] |
P71 | S | 53 | m | Memory impairment, disorientation, amnestic and executive disabilities | |||||||||
P26 | F | 65 | f | Behavioral changes, mixed aphasia, visuospatial disturbancy | ABCA7 | p.R1228C c.3682C > T rs201115102 | het | D | VUS | < 0.01 | 1/54 | 0/137 | - |
P35 | S | 61 | m | Short-term memory impairment, visuospatial disturbancy, dyscalculia, apraxia | ABCA7 | p.D1957Y c.5869G > T | het | D | VUS | - | 1/54 | 0/137 | - |
P75 | S | 61 | m | Vertical gaze pulsy, rigor, ataxia, severe memory impairment | ABCA7 | p.Y750* c.2250C > A rs757657653 | het | D | LP | < 0.01 | 1/54 | 0/137 | [33] |
P33 | F | 64 | m | Cognitive deficit, visuospatial disorientation, | SORL1 | p.K2044R c.6131A > G | het | D | VUS | - | 1/54 | 0/137 | - |
Alterations in genes associated with other neurodegenerative disorders
Heterozygous alterations in autosomal recessive inherited genes
Patient ID | Form | AOO | Sex | Symptoms | Gene | Variant ID | Zygosity | Clinical significance | ACMG classification | MAF (non-neuro) | Inheritance | Patients | Controls | Reference |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
P50 | F | 60 | m | Short-term memory impairment; parkinsonism, prefrontal symptoms | C19ORF12 | p.P60A c.178C > G | het | D | LP | - | AR, AD | 1/54 | 0/137 | - |
P81 | S | 59 | m | Behavioral changes, anxiety | PRKN | p.T240M c.719C > T rs137853054 | het | Conf. Of P | P | < 0.01 | AR | 1/54 | 0/137 | [25] |
P35 | S | 61 | m | Short-term memory impairment, visuospatial disturbancy, dyscalculia, apraxia | LRRK2 | p.A1862V c.5585C > T | het | D | VUS | - | AD | 1/54 | 0/137 | - |
P50 | F | 60 | m | Short-term memory impairment, parkinsonism, prefrontal symptoms | PARK7 | p.Ile91_Leu92fs c.273_274insA | het | D | P | - | AR | 1/54 | 0/137 | - |
P35 | S | 61 | m | Short-term memory impairment, visuospatial disturbancy, dyscalculia, apraxia | SPG11 | p. V2053M c.6157G > A rs149003934 | het | VUS | VUS | < 0.01 | AR | 1/54 | 0/137 | [24] |
P52 | F | 48 | f | Depression, memory impairment | PSAP | p.E108V c.323A > T rs763295469 | het | D | VUS | < 0.01 | AR | 1/54 | 0/137 | - |
Patient ID | Form | AOO | Sex | Symptoms | Gene | Variant ID | Zygosity | Clinical significance | ACMG classification | MAF (non-Finnish) | Inheritance | Patients | Controls | Reference |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
P50 | F | 60 | m | Short-term memory impairment, prefrontal symptoms, parkinsonism | C19ORF12 | p.P60A c.178C > G | het | D | LP | - | AR, AD | 1/54 | 0/137 | - |
PARK7 | p.Ile91_Leu92fs c.273_274insA | het | D | P | - | AR | 1/54 | 0/137 | - | |||||
P35 | S | 61 | m | Short-term memory impairment, visuospatial disturbancy, dyscalculia, apraxia | ABCA7 | p.D1957Y c.5869G > T | het | D | VUS | - | AD | 1/54 | 0/137 | - |
LRRK2 | p.A1862V c.5585C > T | het | D | VUS | - | AD | 1/54 | 0/137 | - | |||||
SPG11 | p.V2053M c.6157G > A rs149003934 | het | VUS | VUS | < 0.01 | AR | 1/54 | 0/137 | [24] |