CNTD1

Chr 17

cyclin N-terminal domain containing 1

Also known as: CNTD, COSA1

NCBI Gene: 124817 ENSG00000176563 UniProt: Q8N815

Predicted to be involved in reciprocal meiotic recombination and regulation of meiotic cell cycle. Predicted to act upstream of or within spermatogenesis. Predicted to be located in chromosome. Predicted to be active in site of double-strand break. [provided by Alliance of Genome Resources, Jul 2025]

Active trials

Pathogenic / LP

ClinVar variants

Pubs (1 yr)

0.8

Missense Z

0.73

LOEUF

Clinical Summary— CNTD1

⚡

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.

0.73LOEUF

pLI 0.005

Z-score 2.41

OE 0.39 (0.22–0.73)

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.

0.84Z-score

OE missense 0.82 (0.72–0.94)

145 obs / 176.3 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.0.39 (0.22–0.73)

0≤0.351.4

Missense OE?Ratio of observed to expected missense variants. OE ≤ 0.6 = fewer missense variants than expected by chance.0.82 (0.72–0.94)

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.0.79

0≤1.21.6

LoF obs/exp: 7 / 18.0Missense obs/exp: 145 / 176.3Syn Z: 1.42

0.6745th %ile

GOF

0.5760th %ile

LOF

0.2679th %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.