rs587777726

Positions:

• chr4-125446297-A-C
• chr4-125446297-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PVS1_Moderate PM2 PP5

The NM_024582.6(FAT4):​c.7200-2A>C variant causes a splice acceptor, intron change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: FAT4 NM_024582.6 splice_acceptor, intron
• Scores: Splicing: ADA: 0.9997
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 5.65

Genes affected

FAT4 (HGNC:23109): (FAT atypical cadherin 4) The protein encoded by this gene is a member of the protocadherin family. This gene may play a role in regulating planar cell polarity (PCP). Studies in mice suggest that loss of PCP signaling may cause cystic kidney disease, and mutations in this gene have been associated with Van Maldergem Syndrome 2. Alternatively spliced transcript variants have been noted for this gene. [provided by RefSeq, Mar 2014]

FAT4 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 5 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.016325438 fraction of the gene. Cryptic splice site detected, with MaxEntScore 9, offset of -6, new splice context is: atttctgctttctgctttAGtta. Cryptic site results in inframe change. If cryptic site found is not functional and variant results in exon loss, it results in frameshift change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 4-125446297-A-C is Pathogenic according to our data. Variant chr4-125446297-A-C is described in ClinVar as [Pathogenic]. Clinvar id is 156112.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FAT4	NM_001291303.3	c.7204A>C	p.Arg2402Arg	synonymous_variant	9/18	ENST00000394329.9	NP_001278232.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FAT4	ENST00000394329.9	c.7204A>C	p.Arg2402Arg	synonymous_variant	9/18	5	NM_001291303.3	ENSP00000377862.4
FAT4	ENST00000335110.5	c.2094-2A>C		splice_acceptor_variant, intron_variant		1		ENSP00000335169.5
FAT4	ENST00000674496.2	c.1975A>C	p.Arg659Arg	synonymous_variant	8/17			ENSP00000501473.2
FAT4	ENST00000509444.1	n.187A>C		non_coding_transcript_exon_variant	1/2	3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Hennekam lymphangiectasia-lymphedema syndrome 2 Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Sep 01, 2014

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Benign	-0.17
CADD	Benign	15
DANN	Benign	0.85
Eigen	Pathogenic	0.72
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Pathogenic	0.98	D
GERP RS		2.8

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
SpliceAI score (max)		0.22		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.22		Position offset: 2

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

Publications

LitVar

Other links and lift over

dbSNP: rs587777726; hg19: chr4-126367452;