rs1557177627

Variant names:

• chrX-154359850-C-A
• rs1557177627
• NM_001110556.2:c.3861G>T

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4 BS2

The NM_001110556.2(FLNA):​c.3861G>T​(p.Gln1287His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000661 in 1,209,517 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 3 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.0000089 (0 hom., 1 hem., cov: 25)
  • Exomes 𝑓: 0.0000064 (0 hom. 2 hem.)
• Consequence: FLNA NM_001110556.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0710

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 Likely_benign. Variant got -5 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.27697882).
• BS2: High Hemizygotes in GnomAdExome4 at 2 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FLNA	NM_001110556.2	c.3861G>T	p.Gln1287His	missense_variant	Exon 23 of 48	ENST00000369850.10	NP_001104026.1
FLNA	NM_001456.4	c.3861G>T	p.Gln1287His	missense_variant	Exon 23 of 47		NP_001447.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FLNA	ENST00000369850.10	c.3861G>T	p.Gln1287His	missense_variant	Exon 23 of 48	1	NM_001110556.2	ENSP00000358866.3

Frequencies

GnomAD3 genomes AF: 0.00000889 AC: 1 AN: 112484 Hom.: 0 Cov.: 25 AF XY: 0.0000289 AC XY: 1 AN XY: 34636

Gnomad AFR AF: 0.00

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: 0.0000188

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.00000638 AC: 7 AN: 1097033 Hom.: 0 Cov.: 33 AF XY: 0.00000551 AC XY: 2 AN XY: 363015

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: 0.00000713

Gnomad4 OTH exome AF: 0.0000217

GnomAD4 genome AF: 0.00000889 AC: 1 AN: 112484 Hom.: 0 Cov.: 25 AF XY: 0.0000289 AC XY: 1 AN XY: 34636

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000188

Gnomad4 OTH AF: 0.00

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

Feb 23, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glutamine with histidine at codon 1287 of the FLNA protein (p.Gln1287His). The glutamine residue is moderately conserved and there is a small physicochemical difference between glutamine and histidine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with FLNA-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.13
BayesDel_addAF	Benign	-0.14	T
BayesDel_noAF	Benign	-0.44
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.60	D;.;.;.;.
FATHMM_MKL	Benign	0.33	N
LIST_S2	Uncertain	0.95	D;D;.;D;D
M_CAP	Benign	0.074	D
MetaRNN	Benign	0.28	T;T;T;T;T
MetaSVM	Uncertain	-0.15	T
MutationAssessor	Benign	1.5	L;.;L;L;.
PrimateAI	Benign	0.43	T
PROVEAN	Benign	-2.1	N;.;N;N;.
REVEL	Uncertain	0.32
Sift	Benign	0.043	D;.;D;D;.
Sift4G	Uncertain	0.039	D;D;D;D;T
Polyphen		0.39	B;.;P;P;.
Vest4		0.22
MutPred		0.55		Gain of catalytic residue at Q1287 (P = 0.0435);.;Gain of catalytic residue at Q1287 (P = 0.0435);Gain of catalytic residue at Q1287 (P = 0.0435);.;
MVP		0.83
MPC		0.68
ClinPred		0.65	D
GERP RS		3.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.30
gMVP		0.49

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

LitVar

Other links and lift over

dbSNP: rs1557177627; hg19: chrX-153588218;