Table 1 Demographics, molecular results, and psychiatric features.

From: Elevated FMR1-mRNA and lowered FMRP – A double-hit mechanism for psychiatric features in men with FMR1 premutations

Case

Category

Age

CGG repeats

mRNA (SD)

FMRP

Full scale IQ

Dominant psychiatric feature

1

A

9

150

2.56 (0.27)

86 (WISC-IV)

Mood instability, ADHD

2

C

53

180–690

3.85 (0.30)

101 (WAIS-III)

Bipolar disorder NOS

3

B

36

205

2.59 (0.1)

6.04

51 (WAIS-III)

ADHD, schizophrenia, ID

4

B

28

226 (260–445)

3.85 (0.43)

117 (WAIS-III)

Social phobia, OCD, schizotypical symptoms

5

C

58

20–800

2.98 (0.06)

84 (WAIS-IV)

Bipolar I, OCD, panic disorder, generalized anxiety

6

B

25

570, 730, 1090 (240)

3.3 (0.04)

33.75

61 (WAIS-III)

ASD, Social Phobia, auditory hallucinations, ID

7

B

22

255 (270–535)

5.79 (0.13)

47.33

65 (WASI)

Psychosis in past, anxiety disorder, OCD, ID

8

B

22

215, 900 (220, 335)

2.30 (0.16)

13.42

45 (WISC-IV)

Social phobia, ASD symptoms, ID

9

D

23

160–190

5.02 (0.49)

70.00

86 (WISC-III)

ASD, psychosis

10

D

19

170

4.98 (0.32)

36.00

54 (WAIS-III)

ASD, paranoid thinking, anxiety disorder, ID

11

D

57

133

3.59 (0.28)

ASD, past ADHD

12

D

24

67

2.40 (0.23)

18.30

110 (WAIS-III)

ASD, bipolar II disorder, OCD

13

C

27

570, 750, 890 (104)

2.38 (0.05)

60 (SB5)

Anxiety disorder, ID, “socially awkward”

14

D

34

88

2.8 (0.18)

107 (WAIS-III)

Biploar I disorder, substance abuse, stress disorder, past ADHD

  1. (A) Methylated Premutation, (B) Methylation Mosaicism, (C) Size/Methylation Mosaicism, (D) Premutation.
  2. Under CGG repeats column the parentheses enclose the allele sizes that are unmethylated.
  3. Normal FMR1mRNA range: 1.42 ± 0.26 (Tassone et al.5).
  4. FMRP levels given in percentage of the mean levels calculated for control males.
  5. data not available.
  6. ASD autism spectrum disorder, ADHD attention deficit/hyperactivity disorder, ID intellectual disability, OCD obsessive compulsive disorder, NOS not otherwise specified, SB5 Stanford Binet Intelligence Scales 5th edition, WASI Wechsler Abbreviated Scales of Intelligence, WAIS Wechsler Adult Intelligence Scale, WISC Wechsler Intelligence Scale for Children.