NM_022836.4:c.77T>C

Variant names:

• chr1-113905663-T-C
• rs1553260999
• NM_022836.4:c.77T>C

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_022836.4(DCLRE1B):​c.77T>C​(p.Leu26Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,684 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic 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. L26R) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: DCLRE1B NM_022836.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.75
• Publications: 0 publications found

Genes affected

DCLRE1B (HGNC:17641): (DNA cross-link repair 1B) DNA interstrand cross-links prevent strand separation, thereby physically blocking transcription, replication, and segregation of DNA. DCLRE1B is one of several evolutionarily conserved genes involved in repair of interstrand cross-links (Dronkert et al., 2000 [PubMed 10848582]).[supplied by OMIM, Mar 2008]

AP4B1 (HGNC:572): (adaptor related protein complex 4 subunit beta 1) This gene encodes a subunit of a heterotetrameric adapter-like complex 4 that is involved in targeting proteins from the trans-Golgi network to the endosomal-lysosomal system. Mutations in this gene are associated with cerebral palsy spastic quadriplegic type 5 (CPSQ5) disorder. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2011]

AP4B1 Gene-Disease associations (from GenCC):

• AP-4 deficiency syndrome

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• hereditary spastic paraplegia 47

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
• AP4-related intellectual disability and spastic paraplegia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.925

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_022836.4. 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
	DCLRE1B	NM_022836.4	MANE Select	c.77T>C	p.Leu26Pro	missense	Exon 1 of 4	NP_073747.1
	DCLRE1B	NM_001363690.2		c.77T>C	p.Leu26Pro	missense	Exon 1 of 5	NP_001350619.1
	DCLRE1B	NM_001319946.2		c.-136T>C		5_prime_UTR	Exon 1 of 3	NP_001306875.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DCLRE1B	ENST00000650450.2	MANE Select	c.77T>C	p.Leu26Pro	missense	Exon 1 of 4	ENSP00000498042.1
	DCLRE1B	ENST00000466480.2	TSL:1	n.77T>C		non_coding_transcript_exon	Exon 1 of 4	ENSP00000497696.1
	DCLRE1B	ENST00000650596.1		c.77T>C	p.Leu26Pro	missense	Exon 1 of 3	ENSP00000497882.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461684 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 727146

African (AFR) AF: 0.00 AC: 0 AN: 33476

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26132

East Asian (EAS) AF: 0.00 AC: 0 AN: 39692

South Asian (SAS) AF: 0.00 AC: 0 AN: 86242

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53386

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111874

Other (OTH) AF: 0.00 AC: 0 AN: 60390

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.92
BayesDel_addAF	Pathogenic	0.43	D
BayesDel_noAF	Pathogenic	0.38
CADD	Pathogenic	30
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.58	D
Eigen	Pathogenic	0.76
Eigen_PC	Pathogenic	0.70
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Benign	0.84	T
M_CAP	Uncertain	0.18	D
MetaRNN	Pathogenic	0.93	D
MetaSVM	Uncertain	0.12	D
MutationAssessor	Pathogenic	3.4	M
PhyloP100		7.8
PrimateAI	Uncertain	0.77	T
PROVEAN	Pathogenic	-5.3	D
REVEL	Pathogenic	0.84
Sift	Uncertain	0.0090	D
Sift4G	Uncertain	0.015	D
Polyphen		1.0	D
Vest4		0.89
MutPred		0.80		Loss of stability (P = 0.0055)
MVP		0.95
MPC		0.86
ClinPred		1.0	D
GERP RS		5.3
PromoterAI		-0.078	Neutral
Varity_R		0.97
gMVP		0.97
Mutation Taster		=19/81	disease causing

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

Other links and lift over

dbSNP: rs1553260999; hg19: chr1-114448285;