X-154362746-T-G

Position:

• chrX-154362746-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP2 PP3

The ENST00000369850.10(FLNA):​c.2319A>C​(p.Lys773Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000275 in 1,090,798 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another nucleotide change resulting in same amino acid change has been previously reported as Uncertain significancein ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. K773E) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 24)
  • Exomes 𝑓: 0.0000028 (0 hom. 1 hem.)
• Consequence: FLNA ENST00000369850.10 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.0910

Genes affected

FLNA (HGNC:3754): (filamin A) The protein encoded by this gene is an actin-binding protein that crosslinks actin filaments and links actin filaments to membrane glycoproteins. The encoded protein is involved in remodeling the cytoskeleton to effect changes in cell shape and migration. This protein interacts with integrins, transmembrane receptor complexes, and second messengers. Defects in this gene are a cause of several syndromes, including periventricular nodular heterotopias (PVNH1, PVNH4), otopalatodigital syndromes (OPD1, OPD2), frontometaphyseal dysplasia (FMD), Melnick-Needles syndrome (MNS), and X-linked congenital idiopathic intestinal pseudoobstruction (CIIPX). Two transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Mar 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), FLNA. . Gene score misZ 3.7802 (greater than the threshold 3.09). GenCC has associacion of gene with X-linked Ehlers-Danlos syndrome, terminal osseous dysplasia-pigmentary defects syndrome, FG syndrome 2, frontometaphyseal dysplasia, heterotopia, periventricular, X-linked dominant, Melnick-Needles syndrome, otopalatodigital syndrome type 2, periventricular nodular heterotopia, otopalatodigital syndrome type 1, intestinal pseudoobstruction, neuronal, chronic idiopathic, X-linked, familial thoracic aortic aneurysm and aortic dissection, congenital short bowel syndrome, frontometaphyseal dysplasia 1, cardiac valvular dysplasia, X-linked.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.8

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FLNA	NM_001110556.2	c.2319A>C	p.Lys773Asn	missense_variant	16/48	ENST00000369850.10	NP_001104026.1
FLNA	NM_001456.4	c.2319A>C	p.Lys773Asn	missense_variant	16/47		NP_001447.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FLNA	ENST00000369850.10	c.2319A>C	p.Lys773Asn	missense_variant	16/48	1	NM_001110556.2	ENSP00000358866

Frequencies

GnomAD3 genomes Cov.: 24

GnomAD4 exome AF: 0.00000275 AC: 3 AN: 1090798 Hom.: 0 Cov.: 33 AF XY: 0.00000280 AC XY: 1 AN XY: 357402

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000358

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 24

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Melnick-Needles syndrome;C0265293:Frontometaphyseal dysplasia;C1844696:Oto-palato-digital syndrome, type II;C1848213:Heterotopia, periventricular, X-linked dominant Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 07, 2023

This variant is not present in population databases (gnomAD no frequency). This sequence change replaces lysine, which is basic and polar, with asparagine, which is neutral and polar, at codon 773 of the FLNA protein (p.Lys773Asn). This variant has not been reported in the literature in individuals affected with FLNA-related conditions. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt FLNA protein function. ClinVar contains an entry for this variant (Variation ID: 1427098). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.79
BayesDel_addAF	Benign	-0.044	T
BayesDel_noAF	Benign	-0.30
CADD	Benign	20
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.80	D;.;.;.;.
FATHMM_MKL	Benign	0.32	N
LIST_S2	Pathogenic	0.99	D;D;.;D;D
M_CAP	Pathogenic	0.36	D
MetaRNN	Pathogenic	0.80	D;D;D;D;D
MetaSVM	Uncertain	0.45	D
MutationAssessor	Uncertain	2.8	M;.;M;M;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.81	D
PROVEAN	Uncertain	-4.3	D;.;D;D;.
REVEL	Pathogenic	0.65
Sift	Uncertain	0.0030	D;.;D;D;.
Sift4G	Uncertain	0.0030	D;D;D;D;D
Polyphen		0.72	P;.;D;D;.
Vest4		0.67
MutPred		0.57		Loss of methylation at K773 (P = 0.0186);.;Loss of methylation at K773 (P = 0.0186);Loss of methylation at K773 (P = 0.0186);.;
MVP		0.94
MPC		1.3
ClinPred		0.99	D
GERP RS		2.1
Varity_R		0.75
gMVP		0.61

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

No publications associated with this variant yet.

Other links and lift over

hg19: chrX-153591114;