Genetic Variant FOXN1:p.Asp540His (chr17-28535189-G-C) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001369369.1(FOXN1):c.1618G>C(p.Asp540His) variant causes a missense change. The variant allele was found at a frequency of 0.00000657 in 152,212 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D540N) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Consequence

FOXN1
NM_001369369.1 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 6.49

Publications

5 publications found

Variant links:

Genes affected

FOXN1 (HGNC:12765): (forkhead box N1) Mutations in the winged-helix transcription factor gene at the nude locus in mice and rats produce the pleiotropic phenotype of hairlessness and athymia, resulting in a severely compromised immune system. This gene is orthologous to the mouse and rat genes and encodes a similar DNA-binding transcription factor that is thought to regulate keratin gene expression. A mutation in this gene has been correlated with T-cell immunodeficiency, the skin disorder congenital alopecia, and nail dystrophy. Alternative splicing in the 5' UTR of this gene has been observed. [provided by RefSeq, Jul 2008]

FOXN1 links:

RSKR (HGNC:26314): (ribosomal protein S6 kinase related) Predicted to enable protein kinase activity. Predicted to be involved in protein phosphorylation. [provided by Alliance of Genome Resources, Apr 2022]

RSKR links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FOXN1	NM_001369369.1 link	c.1618G>C	p.Asp540His	missense_variant	Exon 8 of 9	ENST00000579795.6	NP_001356298.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
FOXN1	ENST00000579795.6 link	c.1618G>C	p.Asp540His	missense_variant	Exon 8 of 9	1	NM_001369369.1	ENSP00000464645.1	O15353
FOXN1	ENST00000226247.2 link	c.1618G>C	p.Asp540His	missense_variant	Exon 7 of 8	1		ENSP00000226247.2	O15353
RSKR	ENST00000481916.6 link	n.*1195+68862C>G		intron_variant	Intron 7 of 7	1		ENSP00000436369.2	Q96LW2-2
FOXN1	ENST00000577936.2 link	c.1618G>C	p.Asp540His	missense_variant	Exon 8 of 9	4		ENSP00000462159.2	O15353J3KRT9

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152212

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

Cov.:

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152212

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74368

show subpopulations

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.0000241

AC:

AN:

41446

American (AMR)

AF:

0.00

AC:

AN:

15286

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5194

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68046

Other (OTH)

AF:

0.00

AC:

AN:

2094

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.69

BayesDel_addAF

Pathogenic

0.21

BayesDel_noAF

Uncertain

0.060

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.34

T;T

Eigen

Uncertain

0.28

Eigen_PC

Uncertain

0.33

FATHMM_MKL

Benign

0.74

LIST_S2

Uncertain

0.92

.;D

M_CAP

Uncertain

0.13

MetaRNN

Uncertain

0.73

D;D

MetaSVM

Uncertain

0.40

MutationAssessor

Benign

1.8

L;L

PhyloP100

6.5

PrimateAI

Uncertain

0.64

PROVEAN

Benign

-0.93

.;N

REVEL

Uncertain

0.50

Sift

Uncertain

0.0090

.;D

Sift4G

Uncertain

0.044

D;D

Polyphen

0.81

P;P

Vest4

0.73

MutPred

0.44

Loss of disorder (P = 0.0735);Loss of disorder (P = 0.0735);

MVP

0.73

MPC

0.11

ClinPred

0.98

GERP RS

3.8

Varity_R

0.37

gMVP

0.40

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over