SPMIP8

Chr 16

sperm microtubule inner protein 8

Also known as: TEPP

NCBI Gene: 374739 ENSG00000159648 UniProt: Q6URK8

Predicted to be involved in flagellated sperm motility. Predicted to be located in cytoplasm; cytoskeleton; and motile cilium. Predicted to be active in axonemal A tubule inner sheath and sperm flagellum. [provided by Alliance of Genome Resources, Apr 2025]

Active trials

Pathogenic / LP

ClinVar variants

Pubs (1 yr)

0.1

Missense Z

0.98

LOEUF

Clinical Summary— SPMIP8

⚡

Population Constraint (gnomAD)

Low constraint (pLI 0.00) — loss-of-function variants are relatively tolerated in the population.

Population Genetics & Constraint

gnomAD v4 — loss-of-function & missense intolerance

gnomAD

Tolerant — LoF & missense variants common in population

LoF Constraint?LOEUF (Loss-of-function Observed/Expected Upper bound Fraction) is the upper bound of the 90% CI for LoF OE — the preferred gnomAD v4 metric. Lower = more intolerant to LoF. LOEUF < 0.35 = highly constrained.

0.98LOEUF

pLI 0.000

Z-score 1.61

OE 0.55 (0.32–0.98)

Tolerant

Typical tolerance to LoF variation

Missense Constraint?Missense Z-score: standard deviations fewer missense variants observed vs. expected. Z > 3.09 (p < 0.001) = gene does not tolerate missense variation. OE missense < 0.6 is also considered constrained.

0.10Z-score

OE missense 0.98 (0.86–1.11)

169 obs / 172.6 exp

Tolerant

Mild missense constraint

Observed / Expected Ratios?Shaded band = 90% confidence interval. Vertical tick = point estimate. Grey threshold line = gnomAD constraint cutoff for that variant class.

LoF OE?Ratio of observed to expected LoF variants. Upper CI bound (LOEUF) ≤ 0.35 = strong LoF constraint signal.0.55 (0.32–0.98)

0≤0.351.4

Missense OE?Ratio of observed to expected missense variants. OE ≤ 0.6 = fewer missense variants than expected by chance.0.98 (0.86–1.11)

0≤0.61.4

Synonymous OE?Control metric — synonymous variants are largely neutral and expected near OE = 1.0. Significant deviation may indicate annotation issues.1.08

0≤1.21.6

LoF obs/exp: 8 / 14.7Missense obs/exp: 169 / 172.6Syn Z: -0.52