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Table 2 Proportions of recessive non-hypomorphic missense mutations in known functional RYR1 domains analyzed by histological diagnosis

From: Genotype-phenotype correlations in recessive RYR1-related myopathies

 

Diagnostic categories

All mutations+

CCD

MmD

Atypical core

CNM/CNM-

CFTD

RYR1-related

(N = 102)

(N = 17)

(N = 16)

myopathy

like myopathy

(N = 5)

myopathy

(N = 27)

(N = 21)

(N = 10)

Domains

Expected %^

Observed % (CI)

Observed % (CI)

Observed % (CI)

Observed % (CI)

Observed % (CI)

Observed % (CI)

Observed % (CI)

MH/CCD hotspot domains

37.8

52 (39–64) **

88 (53–98) **

38 (19–61)

52 (34–69)

43 (25–64)

0 (0–40)

60 (31–83)

  Hotspot domain 1

11.5

16 (10–24)

24 (9–47)

13 (4–36)

11 (4–28)

5 (1–22)

0 (0–40)

30 (11–60)

  Hotspot domain 2

5.9

10 (5–17)

6 (1–27)

13 (4–36)

11 (4–28)

5 (1–22)

0 (0–40)

30 (8–68)**

  Hotspot domain 3

20.4

26 (19–36)

59 (30–83) **

13 (4–36)

30 (16–49)

33 (17–55)

0 (0–40)

0 (0–28)

Selectivity filter o

0.002%

3 (0.7- 11)**

18 (5–49)**

0 (0–20)

0 (0–13)

0 (0–16)

0 (0–43)

0 (0–28)

Triadin

1.2

6 (2–15) **

18 (5–49) ** a

6 (1–28)

4 (1–18)

5 (1–22)

0 (0–43)

0 (0–28)

DHPR

31.4

22 (15–31)

6 (0–27)

19 (7–43)

19 (8–37)

19 (8–40)

20 (4–62)

60 (31–83)

SPRY domains

8.0

10 (5–17)

6 (1–27)

6 (1–28)

0 (0–13)

14 (5–35)

20 (4–62)

10 (2–40)

S100A1

12.0

5 (2–11)

6 (1–27)

6 (1–28)

4 (1–18)

0 (0–16)

20 (4–62)

10 (2–40)

apoCaM

11.0

7 (3–14)

0 (0–18)

0 (0–20)

15 (6–33)

14 (4–35)

0 (0–43)

0 (0–28)

CaCaM

2.7

1 (0–5)

0 (0–18)

0 (0–20)

4 (1–18)

0 (0–16)

0 (0–43)

0 (0–28)

Interdomain interactions

1.5

1 (0–5)

0 (0–18)

0 (0–20)

0 (0–13)

5 (1–22)

0 (0–43)

0 (0–28)

  1. + Six mutations are only included in the ‘All mutations’ analysis as histological information was not available for further classification. ^ Expected percentage (%) = the percentage of mutations in each domain that would occur by chance alone, based on the size of the domain relative to the full RyR1 amino acid sequence. Observed % = percentage of mutations in each functional domain. All Wilson confidence intervals (CI) denote 95% intervals unless indicated by **, which are 99% confidence intervals. Statistically significant results are shown in bold font. N = number of mutations in each diagnostic category. o Amino acids 4891–4900. a All CCD mutations in the triadin-binding region also lie in the selectivity filter of the pore (amino acids 4895–4900) and so are likely to have their main effects on ion conductivity directly, rather than on triadin binding. CCD = central core disease. MmD = multi-minicore disease. CFTD = congenital fiber type disproportion. MH = malignant hyperthermia. DHPR = dihydropyridine receptor. apoCaM = calmodulin without Ca2+ bound. CaCaM = calmodulin with Ca2+ bound.