PAM16

Chr 16AR

presequence translocase associated motor 16

Also known as: CGI-136, MAGMAS, SMDMDM, TIM16, TIMM16

NCBI Gene: 51025 ENSG00000217930 UniProt: Q9Y3D7

This gene encodes a mitochondrial protein involved in granulocyte-macrophage colony-stimulating factor (GM-CSF) signaling. This protein also plays a role in the import of nuclear-encoded mitochondrial proteins into the mitochondrial matrix and may be important in reactive oxygen species (ROS) homeostasis. Mutations in this gene cause Megarbane-Dagher-Melike type spondylometaphyseal dysplasia, an early lethal skeletal dysplasia characterized by short stature, developmental delay and other skeletal abnormalities. [provided by RefSeq, May 2017]

Primary Disease Associations & Inheritance

Spondylometaphyseal dysplasia, Megarbane-Dagher-Melike typeMIM #613320

Active trials

Pathogenic / LP

ClinVar variants

Pubs (1 yr)

-0.5

Missense Z

0.86

LOEUF

Clinical Summary— PAM16

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Population Constraint (gnomAD)

Constrained for loss-of-function variants (OE-LoF 0.27) despite low pLI — interpret in context.

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.

0.86LOEUF

pLI 0.235

Z-score 1.82

OE 0.27 (0.11–0.86)

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.

-0.51Z-score

OE missense 1.16 (0.98–1.38)

94 obs / 81.1 exp

Tolerant

Tolerant to missense variation

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.0.27 (0.11–0.86)

0≤0.351.4

Missense OE?Ratio of observed to expected missense variants. OE ≤ 0.6 = fewer missense variants than expected by chance.1.16 (0.98–1.38)

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.1.00

0≤1.21.6

LoF obs/exp: 2 / 7.3Missense obs/exp: 94 / 81.1Syn Z: 0.01

0.7229th %ile

GOF

0.5562th %ile

LOF

0.2580th %ile

The highest-scoring mechanism for this gene is dominant-negative.

DNprediction above median

Note: In-silico variant effect predictors (SIFT, PolyPhen, REVEL, CADD) may underestimate pathogenicity of missense variants in genes with GOF or DN mechanisms. Consider functional evidence and clinical context.

Predictions from Badonyi M, Marsh JA. PLoS ONE. 2024;19(8):e0307312.