X-154366134-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_001110556.2(FLNA):c.1319G>C(p.Ser440Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000912 in 1,096,244 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 25)
  • Exomes 𝑓: 9.1e-7 (0 hom. 0 hem.)
• Consequence: FLNA NM_001110556.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.98

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 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, FLNA

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FLNA	NM_001110556.2	c.1319G>C	p.Ser440Thr	missense_variant	9/48	ENST00000369850.10
FLNA	NM_001456.4	c.1319G>C	p.Ser440Thr	missense_variant	9/47

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FLNA	ENST00000369850.10	c.1319G>C	p.Ser440Thr	missense_variant	9/48	1	NM_001110556.2

Frequencies

GnomAD3 genomes Cov.: 25

GnomAD4 exome AF: 9.12e-7 AC: 1 AN: 1096244 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 362352

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: 0.00

Gnomad4 OTH exome AF: 0.0000217

GnomAD4 genome Cov.: 25

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

Invitae

Jun 04, 2022

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: 571446). This variant has not been reported in the literature in individuals affected with FLNA-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces serine, which is neutral and polar, with threonine, which is neutral and polar, at codon 440 of the FLNA protein (p.Ser440Thr). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	0.0091	T
BayesDel_noAF	Benign	-0.22
Cadd	Benign	23
Dann	Benign	0.88
DEOGEN2	Uncertain	0.57	D;.;.;.;.
FATHMM_MKL	Uncertain	0.77	D
LIST_S2	Uncertain	0.86	D;D;.;D;D
M_CAP	Uncertain	0.16	D
MetaRNN	Uncertain	0.50	D;D;D;D;D
MetaSVM	Uncertain	0.071	D
MutationAssessor	Uncertain	2.3	M;.;M;M;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Benign	0.44	T
PROVEAN	Benign	-1.9	N;.;N;N;.
REVEL	Uncertain	0.48
Sift	Benign	0.069	T;.;T;T;.
Sift4G	Benign	0.24	T;T;T;T;T
Polyphen		0.099	B;.;B;B;.
Vest4		0.43
MutPred		0.65		Gain of sheet (P = 0.0477);.;Gain of sheet (P = 0.0477);Gain of sheet (P = 0.0477);.;
MVP		0.86
MPC		1.0
ClinPred		0.86	D
GERP RS		4.7
Varity_R		0.41
gMVP		0.67

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs782649138; hg19: chrX-153594502;