Genetic Variant FAM83H:p.Pro637His (chr8-143727551-G-T) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_198488.5(FAM83H):c.1910C>A(p.Pro637His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000697 in 1,434,642 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. 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. P637L) has been classified as Benign.

Frequency

Genomes: not found (cov: 34)

Exomes 𝑓: 7.0e-7 ( 0 hom. )

Consequence

FAM83H
NM_198488.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.432

Publications

0 publications found

Variant links:

Genes affected

FAM83H (HGNC:24797): (family with sequence similarity 83 member H) The protein encoded by this gene plays an important role in the structural development and calcification of tooth enamel. Defects in this gene are a cause of amelogenesis imperfecta type 3 (AI3). [provided by RefSeq, Mar 2010]

FAM83H Gene-Disease associations (from GenCC):

amelogenesis imperfecta, type 3A
Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)

FAM83H links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.16766581).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_198488.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FAM83H	NM_198488.5	MANE Select	c.1910C>A	p.Pro637His	missense	Exon 5 of 5	NP_940890.4

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
FAM83H	ENST00000388913.4	TSL:5 MANE Select	c.1910C>A	p.Pro637His	missense	Exon 5 of 5	ENSP00000373565.3
FAM83H	ENST00000650760.1		c.2513C>A	p.Pro838His	missense	Exon 5 of 5	ENSP00000499217.1
FAM83H	ENST00000395103.2	TSL:2	n.1088C>A		non_coding_transcript_exon	Exon 1 of 2	ENSP00000378535.2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.97e-7

AC:

AN:

1434642

Hom.:

Cov.:

AF XY:

0.00000140

AC XY:

AN XY:

713206

show subpopulations

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

African (AFR)

AF:

0.00

AC:

AN:

32664

American (AMR)

AF:

0.00

AC:

AN:

43614

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25726

East Asian (EAS)

AF:

0.0000256

AC:

AN:

39096

South Asian (SAS)

AF:

0.00

AC:

AN:

85208

European-Finnish (FIN)

AF:

0.00

AC:

AN:

37920

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5076

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1105814

Other (OTH)

AF:

0.00

AC:

AN:

59524

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 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: 0.225

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.21

BayesDel_noAF

Benign

-0.54

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.015

Eigen

Benign

-0.22

Eigen_PC

Benign

-0.36

FATHMM_MKL

Benign

0.068

M_CAP

Pathogenic

0.33

MetaRNN

Benign

0.17

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.8

PhyloP100

0.43

PrimateAI

Pathogenic

0.81

PROVEAN

Benign

-1.4

REVEL

Benign

0.044

Sift

Uncertain

0.0010

Sift4G

Uncertain

0.011

Polyphen

0.94

Vest4

0.17

MutPred

0.35

Loss of glycosylation at T638 (P = 0.0561)

MVP

0.043

MPC

0.74

ClinPred

0.56

GERP RS

3.0

Varity_R

0.13

gMVP

0.23

Mutation Taster

=95/5

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over